SIEMENS 7SJ551 Manual

Multi-f unction Protection Relay for Motors, Transformers, Blow-out Coils, Cables and Overhead Lines - Figure 1 - Order No. G88700-C3527-07-7600 instruction Manual illustration of the multi-function protection relay MFR 7SJ551 O Siemens Nederland N.V. 1998 Version R03-03 1 , , MFR7SJ551 Introduction Certificate of Conformity This product is in conformity with the directive of the Council of the European Communities on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (EMC Council Directive 89/336/EEC). Conformity is proved by tests that have been performed according to article 10 of the Council Directive in accordance with the generic standards EN 50081-2 and EN 50082-2 by Siemens Nederland N.V. The device is designed and manufactured for application in industrial environment. The device is designed in accordance with the standards of IEC 255 and VDE 0435 part 303. MFR 7SJ551 Introduction contents 1 introduction .......................................................................................................................8 ............................................................................................................................................. ................................................................................................................................................. 1.1 Application 8 .. 1.2 Features 8 1.3 Implemented functions ......................................................................................................................... 10 2 Design 2.1 2.2 2.3 ............................................................................................................................I 1 ............................ . . .............................................................................................. .................................................................................................................................... ................................................................................................................................. Arrangements 11 . Dimensions 13 Ordering data 16 2.3.1 Protection unit ................................................................................................................................ 16 2.3.2 Interface unit................................................................................................................................... I6 17 2.3.3 Operation and evaluation software................................................................................................. 17 2.3.4 Spare parts ....................................................... .............................................................................. 2.3.5 Surface mounting bracket .............................................................................................................. 17 2.3.6.0ptical cable...................................................................................................................................17 3 Technical data ............................................................................................................... 18 3.1 ................................................................................................................................... General data 18 3.1 .1 Inputs / outputs ............................................................................................................................... 18 3.1.2 Electrical tests ......................... . .................................................................................................... 22 3.1.3 Mechanical stress test .................................................................................................................... 24 3.1.4 Climatic stress tests ....................................................................................................................... 24 3.1.5 Service conditions ..........................................................................................................................25 3.1.6 Interchangeability........................................................................................................................... 25 3.1.7 Design ............................................................................................................................................ 25 3.2 Component data ............................................................................................................................26 3.3 Thermal overload protection 26 26 3.3.1 Rotor thermal overload protection .................................................................................................. 3.3.2 Stator thermal overload protection .................................................................................................28 3.3.3 Thermal overload protection of non-rotating objects ...................................................................... 29 30 Ambient temperature biasing (optional) 3.4 3.5 Start inhibit 31 3.6 Locked rotor protection 32 32 3.7 Zero speed protection 3.8 Unbalance protection 33 3.9 Undercurrent protection ......................;........................................................................................ 34 3.1 0 Overtemperature protection (optional) 35 3.1 1 Low set overcurrent protection 36 3.1 1.1 Definite time overcurrent protection ............................................................................................. 36 3.1 1.2 Inverse time overcurrent protection.............................................................................................. 37 3.1 1.3 Custom curve overcurrent protection ........................................................................................... 39 40 High set overcurrent protection 3.12 Curve switch 41 3.1 3 Directional earthfault protection (optional) 42 3.14 Undervoltage protection (optional) 44 3.1 5 3.1 6 Overvoltage protection (optional) 45 3.1 7 Breaker failure trip 46 3.1 8 Block ............................................................................................................................................... 46 3.1 9 External command 47 3.20 Ancillary functions 47 .................................................................................................... ..................................................................................... ..................................................................................................................................... ................................................................................................................ ................................................................................................................... .................................................................................................................... ..................................................................................... ................................................................................................. ................................................................................................... ................................................................................................................................ ................................................................................ ............................................................................................. ............................................................................................... ......................................................................................................................... ...................................................................................................................... ........................................................................................................................ MFR 7SJ551 Introduction 4 Method of operation 1 ........................................................................................................49 ................................................................................................ .................................................................................................... 4.1 4.2 Operation of the complete unit 4 9 Thermal overload protection 50 4.2.1 Theoretical background ................................................................................................................. 50 4.2.1.1 Single-body thermal overload model .................................................................................. 50 4.2.1.2 Two-body thermal overload model...................................................................................... 53 4.2.2 Rotor thermal overload protection ................................................................................................. 54 4.2.3 Stator thermal overload protection ................................................................................................ 55 4.2.4 Thermal overload protection of transformers, blow-out coils and cables ......................................56 4.3 Ambient temperature biasing (optional) 57 4.4 Start inhibit 58 4.5 Emergency restart 59 4.6 Locked rotor protection 59 4.7 Zero speed protection 60 4.8 Motor start-up protection 60 4.9 Unbalance protection 62 4.9.1 General ..........................................................................................................................................62 4.9.2 Unbalance protection of motors ................................................................................................... 63 4.1 0 Undercurrent protection 63 4.10.1 General ........................................................................................................................................ 63 4.1 0.2 Motor undercurrent protection ..................................................................................................... 64 4.1 1 Overtemperature protection (optional) 64 4.12 Low set overcurrent protection 65 4.12.1 Definite time overcurrent protection ............................................................................................. 65 4.12.2 Inverse time overcurrent protection ............................................................................................. 65 4.12.3 Custom curve overcurrent protection .......................................................................................... 66 4.13 High set overcurrent protection 66 4.1 3.1 Fast busbar protection using the reverse interlock scheme ........................................................ 67 4.14 Curve switch 67 4.15 Directional earth fault protection (optional) 67 4.1 5.1 Cos f determination ..................................................................................................................... 68 4.1 5.2 Sin f determination.......................................................................................................................69 4.1 5.3 Sensitivity emprovement by shifting the symmetry axis .............................................................. 69 4.1 5.4 Correcting the angular error of the core balance transformer .....................................................69 4.1 5.5 Earth fault location ....................................................................................................................... 70 4.1 6 Undervoltage protection (optional) 70 4.17 Overvoltage protection (optional) 71 71 4.18 Breaker failure trip 4.19 Block 72 4.20 External command 72 4.21 Circuit breaker position 72 . 4.22 Ancillary functions 72 4.22.1 Processing of annunciations........................................................................................................ 72 4.22.2 Fault event data storage and transmission (optional)..................................................................73 4.22.3 Operational value measurements ................................................................................................ 74 4.22.4 Demand ampere meter ............................................................................................................... 74 74 4.22.5 Test facilities ................................................................................................................................ 4.22.6 Hardware monitoring ................................................................................................................... 74 ..................................................................................... .................................................................................................................................... ........................................................................................................................ 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instructions 5.1 5.2 ......................................................................................................... .................................................................................................................................. Unpacking and repacking 76 Preparations 76 5.2.1 Mounting and connections ............................................................................................................. 77 77 5.2.2 Checking the rated data .............................................................................................................. 5.2.3 Checking the (optional) interface unit transmission link ................................................................ 77 . . 5.2.4 connections .................................................................................................................................... 7 8 5.2.5 Checking the connections .......................................................................................................78 ~ 1 Introduction MFR 7SJ551 Operating ia7istrwctiorms 6 ......................................................................................80 ........................................................................................................................ ................................................................................................................. 6.1 6.2 Safety precautions 80 Dialogue with the relay 80 6.2.1 Display panel .................................................................................................................................. 80 6.2.2 Keyboard ........................................................................................................................................80 81 6.2.3 LED indicators ................................................................................................................................ 81 6.2.4 Operation with a personal computer .............................................................................................. 6.2.5 Front view of the relay .................................................................................................................... 82 6.3 Parameterizing procedure 83 6.3.1 Menu structure ............................................................................................................................... 83 6.3.2 Initial display ................................................................................................................................... 84 6.4 Main menu (OFF LINE) 84 6.5 SETTINGS menu 85 6.6 Settings for DEVICE DATA 86 6.6.1 Non-rotating device ........................................................................................................................ 87 6.6.2 Rotating device............................................................................................................................... 87 6.7 Settings for CHANNELS 89 6.8 Settings for PROTECTIONS 93 6.8.1 THERMAL OVERLOAD protection ................................................................................................ 94 6.8.1.1 Thermal overload protection for rotating objects ................................................................. 94 6.8.1.2 Thermal overload protection for non-rotating objects .......................................................... 97 6.8.2 AMBIENT TEMPERATURE BIASING (optional) ...........................................................................99 6.8.3 START INHIBIT ............................................................................................................................ 100 102 6.8.4 EMERGENCY RESTART ........................................................................................................... 6.8.5 OVERTEMPERATURE protection (optional) ............................................................................... 103 6.8.6 UNDERCURRENT protection ...................................................................................................... 104 6.8.7 LOW SET OVERCURRENT protection ....................................................................................... 105 6.8.7.1 Definite time phase fault overcurrent protection ................................................................ 106 6.8.7.2 Definite time earth fault overcurrent protection ................................................................. 108 6.8.7.3 Inverse time phase fault overcurrent protection ................................................................ 109 6.8.7.4 Inverse time.earth fault overcurrent protection ..................................................................110 6.8.7.5 Custom curve overcurrent protection ................................................................................111 6.8.8 HIGH SET OVERCURRENT protection.......................................................................................113 114 6.8.9 UNBALANCE protection ............................................................................................................. 6.8.1 0 DIRECTIONAL EARTHFAULT protection (optional) .................................................................. 115 6.8.1 1 LOCKED ROTOR protection.............:........................................................................................ 118 6.8.12 ZERO SPEED protection ............................................................................................................ 118 6.8.1 3 UNDERVOLTAGE protection (optional) ..................................................................................... 119 6.8.1 4 OVERVOLTAGE protection (optional) ...................................................................................I19 6.8.1 5 BREAKER FAILURE TRIP ......................................................................................................... 120 6.8.16 CURVE SWITCH .......................................................................................................................122 6.8.17 BLOCK ....................................................................................................................................... 123 6.8.1 8 EXTERNAL COMMAND ............................................................................................................ 125 125 6.8.1 9 CIRCUIT BREAKER POSITION ................................................................................................ 6.9 Settings for TRANSIENT DATA 127 6.10 Settings for the REAL TIME CLOCK 127 6.11 MARSHALLING of binary inputs, binary outputs and LED indicators 128 6.1 1 1 General ....................................................................................................................................... 128 6.1 1.2 Marshalling of the BINARY INPUTS ..........................................................................................129 6.1 1.3 Marshalling of the OUTPUT RELAYS ........................................................................................ 132 6.1 1.4 Marshalling of the LED INDICATORS (optional) ........................................................................ 136 6.12 Settings for SERIAL COMMUNICATION (optional) 137 6.13 Putting the relay into operative mode (ON LINE) 139 6.14 Annunciations 140 6.14.1 Introduction................................................................................................................................. 140 6.14.2 MEASURED VALUES ................................................................................................................ 141 6.14.3 COUNTERS ...............................................................................................................................4 3 6.14.4ALARM /TRIP DATA .................................................................................................................143 6.1 4.5 DEMAND AMPERE METER .................................................................................................... 146 6.14.6 RUNNING HOURS ....................................................................................................................147 ............................................................................................................ .................................................................................................................. ............................................................................................................................ ........................................................................................................... ................................................................................................................ ......................................................................................................... . 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Introduction MFR 7SJ551 I 6.1 4.7 MANUFACTURER DATA .......................................................................................................... 148 Resetting all settings t o factory settings 149 6.15 Testing and commissioning 151 6.16 6.16.1 General ....................................................................................................................................... 151 6.1 6.2 Testing the measurement of operational values ....................................................................... 152 6.1,6.3 Testing the motor status ............................................................................................................ 153 153 6.1 6.4 Testing the rotor thermal overload protection ............................................................................ 6.1 6.5 Testing the stator thermal overload protection ........................................................................156 6.1 6.6 Testing the thermal overload protection of non-rotating objects ............................................... 159 161 6.1 6.7 Testing the ambient temperature biasing .................................................................................. 162 6.1 6.8 Testing the start inhibit .........;.................................................................................................... 163 6.1 6.9. Testing the emergency restart .................................................................................................. 163 6.1 6.10 Testing the overtemperature protection ................................................................................... 163 6.1 6.1 1 Testing the undercurrent protection......................................................................................... 6.1 6.1 2 Testing the low set overcurrent protection............................................................................... 164 6.16.1 2.1 Testing the definite time overcurrent protection............................................................ 164 165 6.1 6.12.2 Testing the inverse time overcurrent protection............................................................ 6.1 6.1 2.3 Testing the custom curve overcurrent protection ........................................................ 165 166 6.1 6.1 3 Testing the high set overcurrent protection ............................................................................. 166 6.16.1 4 Testing the unbalance protection ............................................................................................ 167 6.1 6.1 5 Testing the locked rotor protection .......................................................................................... 168 6.1 6.1 6 Testing the zero speed protection ........................................................................................... 6.1 6.1 7 Testing the directional earthfault protection........................................................................ 168 169 6.16.1 8 Testing the undervoltage protection ..................................................................................... ;.............169 6.1 6.1 9 Testing the overvoltage protection ............................................................................ 6.1 6.20 Testing the breaker failure trip ............................................................................................ 170 6.1 6.21 Testing the curve switch ....................................................................................................... 170 172 6.1 6.22 Testing the block function ........................................................................................................ 173 6.1 6.23 Testing the external command ............................................................................................ 173 6.1 6.24 Testing the circuit breaker position .......................................................................................... 6.17 Commissioning using primary tests 174 6.1 7.1 Current circuit checks ................................................................................................................. 174 6.17.2 Checking the reverse interlock scheme (if used) ...................................................................... 174 175 6.17.3 Testing the switching of binary inputs and outputs .................................................................... 176 6.17.4 Tripping test including circuit breaker ........................................................................................ 6.1 7.5 Putting the relay into operation ..................................................................................................176 ................................................................................. .................................................................................................... .. ....................................................................................... 1 Maintenance and trouble shooting 7 I 7.1 7.2 7.3 7.4 7.5 7.6 ................................................................177 .........................................................................................................................................177 Self test ........................................................................................................................................177 Replacing the real time clock module ................................................................................... 178 Power failure test ........................................................................................................................179 General Routine checks .................................................................................................................. 1 7 7 Trouble shooting ........................................................................................... .........................176 7.6.1 Replacing the mini-fuse ............................................................................................................... 180 Repairs .............................................................................................................182 Storage .............................................................................................................183 ~ I Appendix . . . . A B C D E. ................................................................................................................................ 184I ............................... ........................................................................... ............................................................................................................. .................................................................................................... ............................................................................................................................. General diagrams 185 Typical wiring diagrams 190 Motor application example 192 Default values 199 Setting tables ....................................................................................................................... 204 I " ' MFR 7SJ551 F. Introduction Advice of return 7SJ55 ................................................................................................................ 224 NOTE: This instruction manual does not intend to cover ail details in equipment, nor to provide for every possible contingency occurring in connection with installation, operation or maintenance. a - Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purpose, the matter should be referred to the local Siemens sales office. The contents of this instruction manual shall not become part nor modify any prior or existing agreement, commitment or relationship. The sales contract contains the entire obligations of Siemens. The warranty contained in the contract between the parties is the sole warranty of Siemens. Any statements contained herein do not create new warranties nor modify the existing warranty. 1 1 " , Introduction MFR 7SJ551 I Introduction 1.I Application The relay MFR 7SJ551 is a modern protection unit for low, medium and high voltage electricity network components like motors, transformers, blow-out coils, cables, overhead lines and capacitor banks. The treatment of the electricity network star point is oi no concern. The main applications of MFR 7SJ551 are: - protection against too high temperature - protection against short circuit situations. Too high temperatures in electric components cause isolation ageing, which leads to lifetime shortening of the component. Temperature protection is accompanied with relatively low currents and long time settings. Excessive temperature rising can appear because of: - overload - asymmetrical load or phase loss - underload (fans and pumps) - stalled rotor - multiple starting and tripping - starting too long. Short-circuits in electric components are characterised by very high currents. These currents 1.2 Besides phase and earth short-circuit protection MFR 7SJ551 is used as earth fault direction protection for isolated, compensated and highohmic earthed networks. Furthermore MFR 7SJ551 can be put on as backup protection for differential protection (for generators, motors, transformers, lines or bus bars) and distance protection. MFR 7SJ551 provides a complete statistical record of the protected electric component. The number of alarms and trips is recorded in a memory. All relevant alarm and trip data such as origin, day and time, duration and trip levels can be read off on the display. During an alarm or trip event the magnitudes of the instantaneous values are stored for a period of 3 seconds. This information can be visualized with a PC connected to either the RS485 or the fibre optic interface. Furthermore, the serial interfaces can be used for incorporating MFR 7SJ551 in a substation management system. For data transmission an standardized protocol is used in accordance with IEC 870-5. Features - Controller system with powerful microcontroller; - are acceptable only for short periods of time because of the acting short-circuit strengths. completely digitally measured value processing and control from data acquisition and digitizing of the measured values up to the trip and close decision for the circuit breaker; - complete scope of functions required for the protection of motors, transformers and cables; - separate setting tables for the protection of rotating and non-rotating network components; - all current and voltage protection functions (except thermal overload protection which is based on True RMS measurement) based on the values of the nominal frequency (digital Fourier filtering); the direct current component and the higher harmonic components are suppressed and do not disturb the protection functions; - complete galvanic and reliable separation of the internal processing circuits from the measurement, control and supply circuits of the system, with screened analogue input transducers, binary input and output modules and DC converter; - thermal overload protection of rotating devices: separate thermal replica for stator and rotor based on True RMS current measurement up to 2 heating time constants for the stator thermal replica separate cooling time constants for stator and rotor thermal replica ambient temperature biasing of thermal replica incorporation of additional heating effects of asymmetrical currents; " I MFR 7SJ551 - thermal overload protection of non-rotating devices: up to 2 heating time constants with extremely wide setting ranges for optimal thermal protection of cables and transformers s externally adjustable time constant ambient temperature biasing of thermal replica; Introduction - curve switch and blocking functions offering an adaptive feature to change the relay characteristics according to prevailing system conditions (like motor status 'start' or 'running'); - equipped with highly sophisticated protection algorithms which offer optimal flexibility in grading with other protection relays and with the thermal limit curves of primary components; - software matrix for signalling and tripping relays; - real time clock: last 3 events are stored with real time stamps of alarm and trip data; - continuous monitoring of the measured values and the hardware and software of the relay; - storage of fault data, storage of instantaneous values during a fault for fault recording; - communication with a PC or a substation management system through an RS485 interface or a fibre optic interface (optional) using an IEC 870-5-103 protocol. - connection of up to 8 temperature sensors (optional); - multi-curve overcurrent and earth fault protection: e insensitive for transients and DC components e separate two-stage tripping characteristics for phase and earth elements four selectable internationally standardized (BS 142, IEC 255-4) tripping characteristics for phase elements: normally inverse, very inverse, extremely inverse and definite time e two additional tripping characteristics for the earth element: long time earth fauit and residual dependent time; custom curves instead of standard curves can be programmed to offer optimal flexibility for both phase and earth elements; " 6 MFR 7SJ551 1.3 Introduction Implemented functions MFR 7SJ551 contains the following functions. Protection of motors ANSI Protection of transformers blow-out coils cables overhead lines capacitor banks Rotor thermal overload protection Stator thermal overload protection Ambient temperature biasing (optional) Start inhibit Emergency restart Locked rotor protection (failure to accelerate) Zero speed protection Unbalance protection Undercurrent protection Overtemperature protection (optional) Definite time overcurrent protection 49R 49 Inverse time overcurrent protection Custom curve overcurrent protection High set overcurrent protection Curve switch Directional earth fault protection (optional) Undervoltage protection (optional) Overvoltage protection (optional) Breaker failure trip Block External command Circuit breaker position Self-monitoring Real time clock Event recording Fault recording Motor statistical data LED indication Operational values measurement Running hours counter PC programming possibility (optional) Substation management system connection (optional) ANSI Thermal overload protection Ambient temperature biasing (optional) 49 Unbalance protection Undercurrent protection Overtemperature protection (optional) Definite time overcurrent protection 46 37 86 48 14 46 37 51 51G 51 N 51 51 G 51 N 50 50G 67N 27 59 For a detailed description please refer to chapter 4. Inverse time overcurrent protection Custom curve overcurrent protection High set overcurrent protection Curve switch Directional earth fault protection (optional) Undervoltage protection (optional) Overvoltage protection (optional) Breaker failure trip Block External command Circuit breaker position Self-monitoring Real time clock Event recording Fault recording Component statistical data LED indication Operational values measurement PC programming possibility (optional) Substation management system connection (optional) 51 51 G 51 N 51 51G 51N 50 50G 67N 27 59 MFR 7SJ551 1) 2 Design 2.1 Arrangements The complete relay is fitted in a draw-out module of Double Europe Format. This module is installed in a housing 7XP20. The optional interface unit (see figure 2.1) provides: - 8 x 3 screw terminals for up to 8 temperature sensors; - 9 pole female connector for the RS-485; - a transceiver and a transmitter fibre optic interface. Two types of housings can be delivered: - 7SJ551*-*A***- in horizontal housing 7XP20 for - panel flush mounting or cubicle installation. 7SJ5.51*-*B***- in vertical housing 7XP20 for panel flush mounting or cubicle installation. The housing has full sheet-metal covers as well as a removable front cover with transparent plastic window for panel mounting. Guide rails are built in for the support of the plug-in module. On the top and bottom plates of the housing, contact areas which are electrically connected to the housing are installed to mate with the earthing springs of the module. Connection to earth is made before the plugs make contact. An Design earth screw has been provided on the back of the housing. The heavy-duty current plug connectors provide automatic shorting of the current transformer circuits whenever the module is withdrawn. All external signals are connected to combined screw snap-on terminals on the backside of the housing. For field wiring, the use of the screwed terminals is recommended; snap-in connection requires special tools. See figure 2.2. The plug modules are labelled according to their mounting position by means of a grid system (e.g. XE-IV.2). The individual connections within a module are numbered consecutively from left to right (when viewed from the back). The degree of protection for the housing is IP51, for the terminals IP21. For dimensions please refer to figure 2.3. For surface mounting, surface mounting brackets are deliverable in two sizes. The short one (depth 271 mm) is used for protection units without mounted interface module. The long one (depth 288 mm) is used with mounted interface module. MFR 7SJ551 Figure 2.1 Design Interface unit I Figure 2 . % U N m h M B n ~ ~ r c ! & i M f S w ~ i ~ w ) 1 1 MFR 7SJ551 $ 2.2 Design Dimensions Figure 2.3 shows the dimensions of the housing. 7SJ551 housing for panel flush mounting or cubicle installation 7XP20 interface unit (optional) recess hole (4 x) 1, 86.4 mounting hole (4 interface unit (optional) Heavy-current connectors: Screwed terminal for maximum 4 mm2. Twin spring crimp connector in parallel for maximum 2.5 mm2. Further connectors: Screwed terminal for maximum 1.5 mm2. Twin spring crimp connector in parallel for maximum 1.5 mm2. Dimensions in mm Figure 2.3 Dimensions for housing 7XP20 for panel flush mounting or cubicle installation cl MFR 7SJ551 Figure 2.4 shows the surface mounting bracket. Figure 2.4 Dimensions for suriace mounting bracket for panel surface mounting ~esign' " I MFR 7SJ551 I) MFR 7SJ.551 can be mounted in standard 19 inch double height racks. Figure 2.5 shows the relevant dimensions. Figure 2.5 Mounting of MFR 7SJ.551 in standard 19"racks Design 1 MFR7SJ551 2.3 Ordering data 2.3.1 Protection unit [ Multi-Function Protection Relay Rated current: rated freoluencv Auxiilarv voltaae Construction I in horizontal housing 7XP20 for panel flush mounting or cubicle mounting in vertical housing 7XP20 for panel flush mounting or cubicle mountina Operating language English German Connections 1 standard version Desian 1 7SJ551 1 7 8 j 9 [a1 11 - 0 1 14 10 1 extended input / output: 3 extra inputs, 2 extra outputs, 4 extra LED indicators extended input Ioutput: 3 extra inputs, 2 extra outputs, 4 extra LED indicators + voltage functions (single phase) 2 extended input loutput: 3 extra inputs, 2 extra outputs, 4 extra LED indicators + voltage functions (single phase) earth fault direction (only in combination with e,,,,,iv, 1 A) 3 Interface module 15 1 without RS485 + optical FSMA-interface RS485 + optical FSMA-interface + connection for 2 RTD elements , RS485 + optical FSMA-interface + connection for 8 RTD elements B C D MFR 7SJ551 2.3.2 Design interface unit The interface unit can be ordered separately with the following ordering numbers. It is always possible to equip the protection unit with the interface unit later on. RS-485 + optical FSMA-interface ................................................... RS-485 + optical FSMA-interface + connection for 2 RTD elements .. RS-485 + optical FSMA-interface + connection for 8 RTD elements .. 2.3.3 Operation and evaluation software Operation and evaluation software 7SJ551 Communication Utility English ........................................................................................ German ....................................................... i....................... ....... @ 2.3.4 G88700-C3526-L130 G88700-C3526-L131 G88700-C3526-L132 688700-M3587-R100 G88700-H3587-R200 Spare pans Complete housing for panel flush mounting or cubicle installation ....... Front cap ..................................................................................... Enbedded software English 1) ......................................................... Enbedded software German 1) ........................................................ G88700-63526-b153 G88080-W-350-b110 G88080-C3526-L9X1 688080-C3526-L9XO 1) By ordering software please give the serienumber of the relay 2.3.5 Surface mounting bracket Surface mounting bracket long (depth 288 mm) ............................... Surface mounting bracket short (depth 271 mm) .............................. 2.3.6 Optical cable Optical cable complete (5 meter)..................................................... Notebook connector .................................................................... G88700-C3526-L154 G88080-X504-Lf 10 MFR 7SJ551 Technical data I) Technical data 3.1.1 laputs / outputs Setting ranges Full scale phase current Full scale regular earth current Full scale sensitive earth current Irn,~ ,,I I, , , Current transformer ratio ? .age transformer ratio Measuring circuits Rated current I, (3 x Iph+1 x 1), Rated current I, ,,,itive 1A Rated voltage U, (1 x U) 100 V o r 110V Rated frequency f , 50 Hz or 60 Hz (selectable) Burden at I, I U, - 1 A current inputs - 5 A current inputs - 1 A sensitive earth current input voltage input capability phase current and regular earth current path - thermal (RMS) 10.05 VA 100 x I, XI, x I, x I, for 1 s for10s continuous one half cycle x I, x I, x I, x I, for 1 s for 10 s continuous one half cycle 30 6 - dynamic (pulse current) Overload capability sensitive earth current path thermal (RMS) - dynamic (pulse current) 250 75 20 4 200 '' MFR 7SJ551 i Technical data 0 Accuracy Phase currents and regular earth currents for full scale current ,,I = 7 x ,I 0 0.05 to 0.5 X In 0 0.5 to 7 X ,1 - for full scale current ,,I = 14 x I, 0 0.1 to 1 X In 0 1 to 14 X In - for full scale current, , I = 28 x In 0.2 to 2 X In 0 2 to 28 X 1, - Sensitive earth current - for full scale current I, , , = 0.35 0.003 to0.025 x I, 0 0.025 t00.35 X in - for full scale current ,,,I = 0.7 0.005 t00.05 X In 0 0.05 to 0.7 X In - for full scale current I, , ,= 1.4 * 0.01 x In to 0.1 * 0.1 to 1.4 X In X 50.025 I5 X In % of setting value 10.05 I 5 o/' In of setting value 50.1 I 5 X In 10.00125 5 5 x I, % of setting value 10.0025 I5 X 10.005 5 5 X S0.0005 I 5 X X % of setting value In 0 X X In In % of setting value In In % of setting value Voltage 0.005 0.01 t00.01 to 1.2 X Un x un Un % of setting value Auxiliary supply voltage Power supply via integrated AC/DC or DCIDC converter Rated auxiliary voltage Uh Permissible variations -60VDC 24 19.2 - 7 2 V D C Superimposed AC voltage, peak to peak I 12 6 % % at rated voltage at limits of admissible voltage Power consumption quiescent energized picked up - Bridging time during failure or short circuit of auxiliary voltage 20 ms at 500 ms at 40msat 500 rns at 40rnsat 500 rns at I 110-250VDC 110-230VAC 8 8 - 3 0 0 ( ~ ~8 8~- 2 5 6 V A C 24 V DC 60 V DC 110VDC 250 V DC 110VAC 230 V AC Technical data MFR 7SJ551 vy duty command and signal contacts Command (trip) and signal relays basic version e number - contacts per relay - version with extended 1/0 number contacts per relay Switching capacity MAKE BREAK DC AC 4 command or signal relays 1 monitor relay output 1 - 4 : 1 NO monitor : 1 NC 6 command or signal relays 1 monitor relay : 2N0 output 1 output 2 - 5 : 1 NO monitor : 1 NC 1000 W N A 30 W150 VA 300 V 250 V 5 A continuous 30 A for 0.5 sec Binary control inputs, number - basic version - version with extended I/O 2 (can be marshalled) 5 (can be marshalled) Current consumption 24 - 250 V DC 110- 230VAC approx. 3 mA, independent of the operating voltage Minimum signal time 2 5 ms Detection time 5 10ms Operating voltage Interface module 0 RS485 serial interface Floating interface for data communication with PC or substation management system Protocol standards o Transmission speed Hamming distance Connection Transmission distance Test voltage isolated by opto-couplers IEC 870-5 with VDEWIZVEI recommendation or protocol DIN 19244 2400 Baud 4800 Baud 9600 Baud 19200 Baud 38400 Baud d=4 9 pole female D connector I 1000 m 500 V DC, 2 kV with rated frequency for 1 min. I MFR 7SJ551 Technical data Fibre optic serial interface e Floating interface for data communication with a isolated according IEC 874-2 control centre IEC 870-5 with VDEWRVEI recommendation or e Protocol standards protocol DIN 19244 2400 Baud Transmission speed 4800 Baud 9600 Baud 19200 Baud 38400 Baud d=4 Hamming distance integrated F-SMA connector for direct optical fibre Connection connection e.g. glass fibre 62.5/125 ym 820 nm 0 Optical wave length ma%.8 dB o Permissible line attenuation 2 km 8 Transmission distance factory setting 'light off' (configurable with 2 jumpers) Signal setting Temperature sensors o Floating interface isolated from the main relay and the serial interfaces o Number of temperature sensors Type 9 Temperature range Connection terminals Distance Cable resistance Accuracy 2 or 8 Pt100 or Nil 00 or Nil20 0 to 200°C 3 for each sensor r 150 m r 25 S2 pro wire < 3 "C I MFR 7SJ551 1 # .2 Technical data Electrical tests Standards for general product testing - Test standards EN 5501 1 EN 68-2 IEC 255-5 IEC 255-22-1 IEC 255-6 IEC 801-2 IEC 801-3 IEC 801 -4 IEC 801-5 VDE 0435 part 303 DIN 40040 DIN 40048-8 Insulation tests @High voltage test (routine test) injecting 50 Hz, 2 kV AC. for 1 minute between the housing and one pair of shortened circuit terminals (auxiliary power, current inputs, voltage input, external control inputs and output contacts); all the other pairs of circuit terminals are connected to the housing; this successively for &I pairs of circuit terminals - Measurement of insulation resistance test voltage 500 V DC - Impulse voltage test (type test) injecting 3 positive and 3 negative 5 kV impulse voltages both common mode and differential mode (1.2150 ps between tested circuit and earth) test voltage 500 V DC - Repeated measurement of isolation resistance - Conclusions no flash-over or break-down between tested circuit and earth or between tested circuit and any other terminal; isolation resistance in all cases exceeded 100 Ms2 turbance immunity tests for the auxiliary supply voltage - Proper operation range of input voltages 24 110 110 - - 60 V DC 25OVDC 230VAC 19.2 88 88 - Spike test (recommended by KEMA) - Rise time Half amplitude width R, Differential mode voltage on auxiliary supply voltage terminal 150 ns 50 ps 5Q 1 kV 72 V DC 300 V DC 276 V AC MFR 7SJ551 I Technical data Disturbance immunity of the current and voltage frequency - Maintenance of accuracy e for the 50 Hz model for the 60 Hz model Harmonic immunity Immunity level to high frequency harmonic current waveforms - 10% 3th harmonic - 10% 5th harmonic influence on operating current c 1% influence on operating current < 1% High frequency disturbance test - Standard - Test frequency - Ri - Repetition rate - Test duration IEC 256-6/255-22-1 1 MHz 200 n 400 shotsls 2s - Common mode voltage - Differential mode voltage Electrostatic discharge test - Standard - Level - Discharge voltage IEC 801 -2 3 4 kV Radiated electromagnetic fields test - Standard - Level - Test frequency - Magnetic field strength - Directions IEC 801-3 3 0.1 5 - 300 Mhz 10 V/m front, top and side 0 Electrical fast transient test lmmunity to noise generated from high energy transient generator Standard - Level Rise time - Half amplitude width Ri - Repetition rate Burst duration - Burst period - Test duration - Common mode voltage between circuit and case between auxiliary supply and case - IEC 801-4 3 5 ns 50 ns 50 R 5 kHz 15 ms 300 ms 10 s MFR 7SJ551 Technical data io frequency interference test - Standard - Radiation - Line interference on all terminals Surge test - Standard 3.1.3 Mechanical stress test Amplitude - Acceleration - Repetition rate 3.1.4 IEC 801-5 IEC 68-2-6 and DIN 40048-8 1 0 - 5 5 HZ 15 mm 2G 20 sweeps in 3 directions Climatic stress tests Permissible ambient temperature - During service - During storage - During transport - Storage and transport -10 "C to +55 "C -25 "C to +70 "C -25 "C to +55 "C standard works packing Humidity class DIN 40040, Class F IEC 68-2-30 Cyclic damp heat test - Standards - Cycle number - Temperature range - Relative humidity DIN 40040, Class F IEC 68-2-30 6 25 "C to 55 "C 95% Storage test (recommended by KEMA) - Duration 16 hours at 16 hours at -25 "C and 1.70 "C We recommend that all units are installed such that they are not subjected to direct sunlight, nor to large temperature fluctuations which may give rise to condensation. ~ I Technical data MFR 7SJ551 3.1.5 MFR 7SJ551 is designed for use in industrial environment, for installation in standard relay rooms and compartments so that with proper installation electro-magnetic compatibility (EMC) is ensured. The following should also be heeded: - All contactors and relays which operate in the same cubicle or on the same relay panel as the MFR 785551 should, as a rule, be fitted with suitable spike quenching elements. - All external connection leads in substations from 100 kV upwards should be screened with a screen capable of carrying power currents and should be earthed at both sides. No special measures are normally necessary for - Devices: M F R 7SJ551 protective devices in housings or in factory fitted subracks are always tested as complete units and are interchangeable as complete units without restrictions. - 0 Service conditions substations of lower voltages. - It is not permissible to withdraw or insert individual modules under voltage. In the withdrawn condition, some components are electrostatically endangered; during handling the standards for electrostatically endangered components must be observed. The modules are not endangered when plugged in. WARNING! The relay is not designed for use in residential, commercial or light-industrial environment as defined in EN 50081. When it is necessary to exchange a device or module, the complete parameter assignment should be repeated. Respective notes are contained in Chapters 5 and 6. Modules: MFR 7SJ551 plug-in modules are interchangeable. 3.1.7 Design Housing 7XP20; refer to section 2.1 Dimension refer to section 2.2 Weight protection unit - interface unit approximately 4 approximately 0.5 - Degree of protection according to DIN 40050 - Housing - Terminals IPS1 IP21 kg kg 0 MFR 7SJ551 l3l.i2 , Technical data Component data Setting ranges Isteps Full load current - Setting range - Steps e 0 * 0.05 1 10 IIflc/ln li~c/ln < 5 IflCn < 5I c n 5 1 10 28 0.05 to 28 to 1 to 10 0.001 0.01 0.1 No load current (motors) - Setting range Ino ioad/ln )S Thermal overload protection 3.3.1 Rotor thermal overload protection 0.05 Setting ranges 1 steps Permissible start-up current - Setting range - Steps * 0.05 5 lstan/ln < * 1 5I a n < 10 5I a n S Istartfln 1 10 28 Permissible start-up time - Setting range - Steps * 1 I tstan - tstart < 10 s 'ermissible number of starts - from warm motor condition - from cold motor condition ,,,n %old Unbalance factor kin" Cooling down factor rotor Cstop,rotor 1 (steps 0.001) ~ MFR 7SJ551 Technical data @ Trip time calculation 2 2 fh,rotor (t) = loeating + [Itn,rotor(t = 0)- !Latins I. exP(+) rot or krotor Trotor 1flc lheating !normal Iinverse Ith,rotor eth,rotor tirip I Accuracy trip time overload factor rotor thermal time constant rotor full load current equivalent heating current normal component of the phase currents inverse component of the phase currents ' thermal load current rotor thermal reserve rotor trip time actual symmetric three phase step current preload current rotor the higher value of 1 s and 2% of zrot0, " MFR 7SJ551 I Technical data e.2 Stator thermal overload protection , I Setting ranges / steps Overload factor stator b a t Thermal time constant stator 1 Thermal time constant stator 2 - Steps for 71,stat and 22,stat T ~ , , ~ ~ ~ a * 1 10 100 ,I ,,t t Itsta, c < < TI,^,,^ 10 slminlh I00 slminlh 999 slmin Weighing factor Pweight Cooling down factor stator Cstop.stator &tr;inS level Setting range * 0 o 0 1 10 5, , ,e 1 ow, 18w,, owam < < < 1 O/o loO/o 95% 1 to 1.5 to 999 min to 999 min switchable between seconds, minutes and hours 0.01 slminfh 0.1 slminlh 1 slmin 1s I s 0 to 95 0.001 0.01 0.1 O/O O/o O/o 70 Trip time calculation Ith,stator thermal load current stator largest True RMS phase motor current lTNe RMS thermal reserve stator IR C full load current ftnp trip time Accuracy trip time the higher value of 1 s and 2% of [pweight Tl.stat f (1 - ~welght)' ' 72,statI I l " r MFR 7SJ551 3.3.3 Technical data" ' Thermal overload protection of non-rotating objects I 1 Setting ranges / steps 1 Overload factor k Thermal time constant 1 Thermal time constant 2 - Steps for 7, and 72 71 72 1 I I I B 1 10 100 It,,,, 5,,t 5,,t c < 5 I0 slminlh 100 slminlh 999 slmin Weighing factor Pweight Adjusting factor Cad] Warning level - Setting range - Steps 1 €Iwam e 0 ,5, , I€ 0 1 5,wI€ e 10 1 to 1.5 1 s to 999 min 1 s to 999 min switchable between seconds, minutes and hours 0.01 s/rnin/h 0.1 s/min/h 1 slmin 0 to 1 0.01 to 10 0 ~ ~ 7 < 1% < 5 loO/o 95% Trip time calculation t =t,,, for €4, =O Ith ,,,I RMS 0th IRC hip Accuracy trip time thermal load current largest True RMS phase current thermal reserve full load current trip time the higher value of 1 s and 2% of [pweight , 71+ (1 weight) ' 2211 - MFR 7SJ551 Technical data Ambient temperature biasing (optional) Setting ranges 1 steps Maximum ambient temperature , ,T Nominal ambient temperature Tmi, - Steps for, ,T and Tmin e 0 ST < 1 "c 0 1 I T < 10°C 0 10 I T < I00 "C 0 100 ST I 200 "C 0 0 0.001 0.01 0.1 1 to to 200 200 "C "C "c "C "C "C Trip time calculation @, bient - ambient ' ' ni, . k2 . lf,c Tmax m .-.i I eth = 0 t = t,p for NOTE: This trip time calculation applies to rotor thermal overload protection, stator thermal overload protection and thermal overload protection for non-rotating objects. Ith,amblent thermal load current adjusted with ambient temperature Ith thermal load current thermal load adjustment with ambient Cambient temperature Tarnbient measured ambient temperature k overload factor I~IC full load current 8th thermal reserve tt ri p trip time MFR 7SJ551 Technical data Start inhibit 3.5 1 Setting ranges / steps Stator start inhibit level Setting range - estator Steps 1 8stat,r 1 esta0, 1 es,,o, 0 1 10 e e Start inhibit release time - Setting range - Steps < < I 1% 10% 100% tinh 0 s to 166 min switchable between seconds, minutes and hours siminlh 0.001 0.01 s/min/h 0.1 slmin 1 s/m i n Calculation rotor start inhibit level krotor = =rotor = d ncold - nwarrn "bold -"cold . f start start krotor %old nwarm Trotor tstm I~IC QrOtor= a,:' c o t or . .~ I C istafi Qrotor overload factor rotor permissible number of starts from cold motor condition permissible number of starts from warm motor condition thermal time constant rotor permissible start-up time full load current permissible start-up current rotor start inhibit level MFR 7SJ551 Technical data Locked rotor protection Setting ranges / steps Permissible locked rotor time - Setting range - tl, Steps 0 0 a 0 1 10 100 Itl, I t,, Itl, <tl, < < < I s 10s 100s I 200 s Trip time calculation ttnp Istart I s 5 Pick-up value Delay time 3.7 trip time permissible start-up current largest phase motor current % of setting value maximum from 10 ms and 2% of tl, Zero speed protection Setting ranges / steps Zero speed detection time - Setting range - Steps a 0 1 10 100 I ,,,,t I ,,,,t I ,,t I ,,t ~E,O < < < 1 s/min/h 10 s/min/h 100 slmin I 166 slmin 0 s to 166 min switchable between seconds, minutes and hours 0.001 s/min/h 0.01 s/min/h 0.1 s/min 1 s/min Tolerances Delay time maximum from 10 ms and 2% of,,,,t MFR 7SJ551 3.8 Technical data Unbaiance protection Setting ranges / steps Unbalance pick-up Izph 0.03 to 1 (steps 0.001 j Unbalance time multiplier Setting range - Steps I tzp < Is a 0 Itzp < 10s 1 5tZp I 25s 10 - Bypass time (only for rotating objects) Setting range fbypass - Steps 0 stzp < 1S ItPP < 10s 0 1 Itzp < 100s o 10 I tap I 200 s 100 - Trip time calcuiation trip linv Reset time trip time inverse component of the phase currents approximately 40 ms Tolerances Pick-up value Delay time % of setting value maximum from 10 ms and 2% of t,", I5 Drop off / pick up ratio Referring to unbalance pick-up value I*, 0.95 zt 0.01 MFR 7SJ551 - Steps 0 0.025 e 1 Technical data < < 5I 5 Iqdln Time multiplier - Setting range - Steps 0 0 It, e 1 S 1 1.4 ~ O P < < I s 10s normally inverse very inverse extremely inverse, long time earth fault residual dependent time custom curve Characteristics 5% of setting value Measuring tolerance Time tolerance maximum from 10 ms and 2% of time setting value Drop-off ratio 0.95 h 0.01 Directional determination Measurement with Ieand Uo Measuring principle active power.(cos $ measurement) or reactive power (sin 4 measurement) Directional trip condition forward or backward Rotation angle - Setting range - Steps o $e 0 S 200 mA - Steps 56 < 0" 56 < 1" 61 62 53 1" 5" " r Technical data MFR 7SJ551 Q Undercurrent protection Setting ranges / steps Undercurrent pick-up Setting range Steps 0 0.05 I I I e 1 0 10 I n - ldln < < I Undercurrent delay time Setting range Steps - &ass 1 10 28 t I< 0 s to 166 rnin switchable between seconds, minutes and hours 0.001 s/mi n/h 0.01 s/min/h 0.1 slmin 1 s/min time (only for rotating objects) tbypass - Setting range - Steps a 0 1 10 I t,, I t,, < < It,, < 1s 10s 100s 0 to 0.001 0.01 0.1 100 s S S S Tolerances Pick-up value Delay time 5 % of setting value maximum from 10 ms and 2% of tl< I: Drop off / pick up ratio Referring to undercurrent pick-up value I< 1.05 i 0.01 Technical data MFR 7SJ551 3.1 0 Overtemperature protection (optional) Setting ranges / steps Type setting temperature sensor Alarm level - Setting range - Steps 8 0 I T I IT 10 IT a 100 ST Trip level - Setting range - Steps 0 ST a 1 ST 0 10 I T 100 ST < < < < < < < I Pt100 or Nil 00 or Nil 20 "c 1 IOOC 100 OC 200 "C 1 "C 10°C 100 "C 200 "C Tolerance Pick-up value 5 3 "C MFR 7SJ551 Technical data @ )II Low set overcurrent protection 3.1 1.I Definite time overcurrent protection Setting ranges Isteps Phase overcurrent pick-up - Setting range - Steps e a 0.05 1 10 5I I I n n n < /ln Sensitive earth overcurrent pick-up - Setting range - Steps 0.003 1 le>/ln t I,> - Steps a 0 1 10 100 It < st I t < < $1 I 1 slminlh 10 slminlh 100s/min 166slmin 0s to 166 min 0s to 166 min switchable between seconds, minutes and hours 0.001 s/min/h 0.01 s/min/h 0.1 slmin 1 slmin approximately 30 ms i .teset time approximately 40 ms Tolerances Pick-up value Delay time I5 % of I> or I,> maximum from 10 ms and 2% of tl> or tl,> Drop off / pick up ratio Referring to overcurrent pick-up value I> 0.95 k 0.01 Technical data MFR 7SJ551 3.11.2 ? inverse time overcurrent protection Setting ranges / steps Phase overcurrent pick-up Setting range - Steps 5 ,In < 0.05 1 Ilp/ln < e 10 I /dln I - ldln 1 10 28 Regular earth overcurrent pick-up - Setting range - Steps Q o 0.05 1 10 2I e n 5 Ie>ln < 5I l n 5 Iedln 1 10 28 Sensitive earth overcurrent pick-up - Setting range 1epJln - Steps 0.025 5 Iep>/In < 1 • 1 I e n< 1.4 Overcurrent time multiplier Setting range - Steps It, < 0 st, < a 1 - tP 1 10 Trip time calculation i Normallv inverse Very inverse Extrernelv inverse trip time phase or earth current pick-up current (phase or earth) time multiplier (phase or earth) MFR 7SJ551 Technical data qditionally for earth current: Lona time earth fault Residual de~endenttime trip time earth current earth current pick-up earth overcurrent time multiplier residual dependent time pick-up Reset time approximately 40 ms hck-up value Delay time I 5 % of setting value maximum from 10 ms and 2% of ttnP Drop off I pick up ratio Referring to phase overcurrent pick-up value I, or earth overcurrent pick-up value ,I 'in C88700-GI176-U810-3 Technical data MFR 7 ~ ~ 5 5 1 3.1 1.3 Custom curve overcurrent protection @ Setting ranges / steps Number of points 2-15 (11 ... 11s) Phase overcurrent pick-up - Setting range - Steps * 0.05 a 1 0 10 Il/h 5I n 5/In I I < < 1 10 I 28 Regular earth overcurrent pick-up - Setting range - Steps * 0.05 Iel>/ln 5 lel>/ln < 1 Sensitive earth overcurrent pick-up - Setting range 1e1>/1n - Steps 0.05 5>/In < 1 1 5 Ie>/ln < 10 * 10 I lel>/ln 5 28 Custom curve time points - Setting range - Steps 0 1 * 10 100 I I I I tll t t t t < < < 5 ... t\i5 1 s/min/h 10 s/rnin/h 100 s/min 166slmin Reset time 0s t o 166 min switchable between seconds, minutes and hours s/min/h 0.001 s/min/h 0.01 0.1 s/min 1 sfmin approximately 40 ms Tolerances Pick-up value Delay time 5 5 % of setting value maximum from 10 ms and 2% of ttri, Drop off / pick up ratio Referring to phase overcurrent pick-up value ll or earth overcurrent pick-up value Ie1 0.95 zk 0.01 Technical data MFR 7SJ551 High set overcurrent protection 012 Setting ranges Isteps Phase overcurrent pick-up - Setting range - Steps e 0 o 0.05 1 10 I>>/[,, 11>>/In 5 l>>/in < < 5 I>>/!, 1 1 10 28 0.05 to 28 0.001 0.01 0.1 Regular earth overcurrent pick-up Setting range 1,>>/In Steps e 0.05 5 Ie>>/In >/1, < 10 o 10 5 I,>>/l, 5 28 - 0.05 0.001 0.01 0.1 earth overcurrent pick-up - Setting range - Steps o 0.025 1 I,>>/l, 5 I,>>/!, 1 1,>>/1, < < 1 1.4 Overcurrent delay time - Setting range t I>> t I,>> - Steps Pick-up time to 166 rnin 0s to 166 min 0s switchable between seconds, minutes and hours slrninlh 0.001 0.01 slminlh 0.1 slmin 1 slmin approximately 30 ms approximately 40 ms Pick-up value Delay time I5 %ofI>>or\,>> maximum from 10 ms and 2% of tl>> or tl,>> Drop off! pick up ratio Referring to high set overcurrent pick-up value I>> 0.95 3.0.01 MFR 7SJ551 Technical data Setting ranges / steps Curve switch mode continuous or pulse or motor status related (only for rotating objects) Motor status (only for rotating objects) startfstop or running Curve switch activation time - Setting range - Steps a a e 0 1 10 100 Itcs I tcs Itcs I tcs tcs lslminlh 10 slminlh lOOs/rnin I 166 slrnin c < < 0s to 166 min switchable between seconds, minutes and hours 0.001 slrninlh 0.01 slminlh 0.1 slmin 1 slmin MFR 7SJ551 Technical data Directional earth fault protection (optional) 6 4 Displacement voltage detection Displacement voltage Setting range - Steps * 0.05 < Ust,/Un < 1 s ustfi/un < - USt,/Un I 1.2 Pick-up delay - Setting range - tustn Steps * 0 1 10 100 5U t, 5U t, 5U t, 5t < < < 1 s/rnin/h 10 s/min/h 100 slrnin I 166 s/rnin 0s to 166 min switchable between seconds, minutes and hours 0.001 slminlh 0.01 siminlh slmin 0.1 1 s/min p-off ratio 5% of set value Measurement tolerance maximum from 10 rns and 2% of tU, Time tolerance Sensitive earth current detection High set earth current pick-up - Setting range - Steps 0.025 1 I,+>/!" < !,>>/In < <1+>/ln < 1 1.4 Delay time - Setting range - Steps @: ' 0 1 10 100 5 t I+> It!+> <tIg> 5t1+> < < < 5 1 slminlh 10slminlh 100s/min 166slmin Low set earth current pick-up (definite time) l+/ln - Steps 0.025 2Illn < 1 1 5 lm>/ln < 1.4 - Setting range 0s to 166 min switchable between seconds, minutes and hours slminlh 0.001 0.01 slminlh 0.1 slmin 1 s/min 0.0025 to 1.4 0.001 0.01 Delay time - Setting range - ' +t I Steps * 0 1 10 100 I 5t I <ti+ l t I+ < < < 5 1 s/min/h 10 s/min/h lOOs/min 166 slrnin set earth current pick-up (definite time) 0I wSetting range lqp/ln 0s to 166 rnin switchable between seconds, minutes and hours 0.001 slminlh slminih 0.01 0.1 s/min slmin 1 0.0025 to 1.4 * * Technical data MFR 7SJ551 - Steps o < < <I,+,& I Iodln 0.025 1 1 1.4 Time multiplier - Setting range - ~QP Steps 0 1 0 0 5 5 < < I s 10s normally inverse very inverse extremely inverse, long time earth fault residual dependent time custom curve Characteristics 5% of setting value Measuring tolerance Time to\erance maximum from 10 ms and 2% of time setting value Drop-off ratio 0.95 k 0.01 Directional determination Measurement with ,I and Uo Measuring principle active power (cos @ measurement) or reactive power (sin (I measurement) Directional trip condition forward or backward Rotation angle - Setting range - Qe Steps e 1 5 , < 0 10 I ' < 1 I 45 5 10 (negative range similar) CT angle correction 1,s 100 mA - 100 mA < I, 5 200 mA I, > 200 mA - Steps 0" 1 6 < lo r 6 < - 61 52 63 lo 50 8 MFR 7SJ551 @5 Technical data Undervoltage protection (optional) Setting ranges Isteps Undervoltage pick-up - Setting range - Steps * 0.05 5 Uc/U, < e 1 I UdU, < U</U, 0.05 to 1.2 0.001 0.01 1 1.2 Undervoltage delay time - Setting range - Steps e 0 1 10 100 rtU< r tU< 5tU< I tU< tUc < < < I 1 s/min/h 10 s/min/h 100s/min 166 s/min 0 s to 166 min switchable between seconds, minutes and hours s/m inlh 0.001 0.01 s/m in/h 0.1 s/mi n 1 s/min approximately 30 ms Reset time approximately 40 ms Tolerances Pick-up value Delay time I 5 % of setting value maximum from 10 ms and 2% of tU< Drop off 1 pick up ratio Referring to undervoltage pick-up value U< 1.05 t- 0.01 MFR 7SJ551 Technical data Qvervoltage protection (optional) 3.1 6 Setting ranges / steps Overvoltage pick-up - Setting range U>/Un U>>/U, - Steps 0 e 0.05 I U/Un c 1 s U/Un < (U = U> or U>>) 1 1.2 Overvoltage delay time Setting range - - Steps 0s to 166 min 0s to 166 min switchable between seconds, minutes and hours s/min/h s/min/h slmin s/min Pick-up time approximately 30 ms Reset time approximately 40 ms Tolerances Pick-up value Delay time Oh of U> or U>> maximum from 10 ms and 2% of tU> or tU>> I5 Drop off 1 pick up ratio Referring to overvoltage pick-up values U> or U>> 0.95 + 0.01 MFR 7SJ551 Technical data Breaker failure protection ;517 Setting ranges Isteps Pick-up value of current Setting range - Steps 0 0 1 e 1 5 lbdIn 10 rl,JIn - stage jbdh < < o 0 1 10 st st I t t Ibf < < < 5 to 28 0.001 0.01 0.1 1 10 I 28 Time stage - Setting range - Steps 0 1 slminlh 10 stminlh 100 slmin 166 slmin 0s to 166 min switchable between seconds, minutes and hours slminlh 0.001 0.01 sfminth 0.1 slmin 1 slmin Block 3.18 Setting ranges 1 steps Block mode continuous or pulse or motor status related (only for rotating objects) Motor status (only for rotating objects) starVstop or running Block activation time $ g z; range ; O 0 0 1 10 100 5 tBLoCK< 1 sfminth 2 tBLoCK< 10 stminlh l tBLoCK < 100 slmin I tBLoCK I 166 slmin Blockable functions 0s to 166 min switchable between seconds, minutes and hours 0.001 s/min/h 0.01 sfminth 0.1 slmin 1 slmin low set overcurrent high set overcurrent undercurrent undervoltage MFR 7SJ551 3.6 9 Technical data External command Setting ranges 1 steps Delay time - Setting range - Steps 0s to 166 min switchable between seconds, minutes and hours 0.001 slminlh 0.01 slminlh 0.1 slmin 1 slmin Tolerances Delay time 3.20 maximum from 10 ms and 2% of,,t I Ancillary functions Operational value measurements Operational current values - range Operational voltage values (optional) - range Directional earth current value (optional) range -. Thermal reserve values - range 0 t h oth,rotor Or @th,stator 0 to 100% (or even higher in combination with ambient temperature biasing) Inverse component of the phase currents 12 - range Operational temperature values (optional) range - Motor status Circuit breaker statistical data Number of stored alarm or trip events Last interrupted current Total of tripped currents stopped or start or running MFR 7SJ.551 Technical data ':ault event data storage Storage of annunciations of the last three faults Reset Automatic reset time (latched output relays) - Setting range treset - Steps e 0 0 1 10 100 ,I ,,,t < I tWset < ItEset 5 ,,,,t 1 s/min/h I 0 s/min/h < 100s/min I 166 s/min 0s to 166 min switchable between seconds, minutes and hours 0.001 s/m in/h 0.01 s/min/h 0.1 slmin 1 s/min Demand amperemeter 8 minutes average 15 minutes average maximum 8 minutes average maximum 15 minutes average Aunning hours counter actual running hours (since previous start-up) total running hours General data ordering code serial number software version Data storage for fault recording (optional) Activation criterion alarm or trip Total recording time 3s Sampling rate - 50 Hz :.. 60 Hz 600 s-' 720 s-' Clock module DALLAS type DS 1286 self-discharge time approximately 10 years " i MFR 7SJ551 Method of o~eration Method of operation 4.1 Operaalon of the complete unit The multi-function protection relay MFR 7SJ551 is equipped with a powerful and proven microcontroller. This provides fully digital processing of all functions from data acquisition of measured values to the tripping of the circuit breaker. Fig. 4.1 shows the basic structure of the unit. The measured currents are fed to the relay via the input transducers for each phase. The inputs are galvanically isolated against the electronic circuits as well as against each other. For the earth current input either the residual current of the phase current transformers or a separate summation current transformer can be connected. 0i The measured voltage is fed to the voltage input transducer. This can be a phase to phase voltage, a phase to earth voltage or a zero sequence (open triangle) voltage. The measured value inputs ME transform the currents and voltage from the measurement transformers and match them to the internal processing level of the unit. Apart from the galvanic and low-capacitive isolation provided by the input transformers, filters are provided for the suppression of interference. The filters have been optimized with regard to bandwidth and processing speed to suit the measured value processing. The matched analogue values are then passed to the analogue input section AE. Figure 4.1 Hardware structure of multi-function protection relay MFR 7SJ551 The analogue input section AE contains input Apart from control and supervision of the measured amplifiers, sample and hold elements for each values, the microprocessor processes the actual input, analogue-to-digital converters and memory protective functions. These include in particular: circuits for the data transfer to the microprocessor. MFR 7SJ551 - filtering and formation of the measured quantities, - continuous calculation of the values which are relevant for fault detection, I 1 ' ' I - determination of the faulted phases in case of a fault, - calculation of True RMS values and symmetric component values for overload detection, - calculation of the directional earth fault data, - scanning of limit values and time sequences, - decision about trip command activations, - storage of measured quantities during a fault for analysis. Binary inputs and outputs to and from the processor are channelled via the inputfoutput elements. From these the processor receives information from other equipment (e.g. blocking signals). Outputs include, in particular, trip commands to the circuit breaker, signals for remote signalling of important events and conditions as well as visual displays (LED'S)and an alpha-numerical display on the front. 4.2 Thermal overload protection 4.2.1 Theoretical background MFR 7SJ551 uses thermal memories to resemble the remaining thermal capacity of the protected component. The remaining thermal capacity can be calculated out of the measured currents. For overload protection MFR 7SJ551 distinguishes between rotating devices (motors) and non-rotating devices (transformers, blow-out coils or cables). Furthermore, for motors MFR 7SJ551 uses different thermal models for the rotor (single-body model) and the stator (two-body model). For nonrotating devices the same two-body model is used. Both the single-bodv and the two-bodv thermal sal ~ h ~ i i in c the s Method of operation An integrated keyboard in connection with a built-in alpha-numerical LCD display enables communication with the unit. All operational data such as setting values, component data, etc., are entered into the protection relay from this panel (refer to sections 6.3 to 6.12). Using this panel the parameters can be recalled and the relevant data for the evaluation of a fault can be read out after a fault has occurred (refer to section 6.14). The dialogue with the relay can be carried out alternatively via the serial interface (optional) by means of a personal computer or a central evaluation unit. During healthy operation, measured values can be transmitted, e.g. of load currents. Both interfaces are isolated; isolation and interference suppression comply with the requirements according to VDE 0435, part 303 and IEC 255. A power supply unit provides the auxiliary supply on the various voltage levels to the described functional units. + 24 V is used for the relay outputs. The analogue input requires 2 15 V whereas the processor and its immediate peripherals are supplied with + 5 V. Transient failures in the supply voltage, up to 500 ms, which may occur during short-circuits in the supply system of the plant are bridged by a voltage storage element (refer to section 3.1 . l ) . 4.2.1 .I Single-body thermal overload model A current flowing through a conductor will cause electric losses proportional to the square value of the current (refer to figure 4.2): Pe = f . i2 with P, - electric warmth dissipation generated by the electric current I f - proportional factor i - electric current MFR 7SJ551 Method of operation with , ,T - maximum temperature for current I We assume the current is a step function: Figure 4.2 Electric losses in a single conducting body The electrical losses P, will cause temperature rising of the body and the body itself will radiate warmth into the surrounding environment: Pe = 'heating From thermal physics the following relations apply: dT Pheating = m - C .dt A a ' (T - Tarnbient) mass specific warmth capacity temperature area thermal transfer factor ambient temperature Foss = rn C T A a Tambieot- ' When we fill in these relations exp;ession for P, we get: @ This is a first order differential equation in T with the following solution: with z - warming-up time constant, rn.C A.a temperature at t = 0 'c=- To - fort < 0 fort>O Then, with P, = f . i2 we get: + Voss with Pheating- thermal losses absorbed by the body P,I - thermal losses radiated into the environment with i(t) = lo i(t)=I As soon as P,I equals P, the body has reached its maximum temperature (t -+ =): and: with lo - preload current Figure 4.3 shows the step response of the temperature of the body. MFR 7SJ551 Method of operation - --f ~ n p t~ T ma---------------- ~$,(t~,,,)=k~~~,, =(I: ,t TO/ -12).e +12 = 7 . In Figure 4.4 illustrates the above equations. /" / tT /' TLbI., Figure 4.3 - - - - - - - - -- - - - - - - - - , ,T t - ~ u r r e n e 3 e @ r e s ~ o nof s ethe temperature The solution of the differential equation changes to: 12).e --t 7 +-. A .a / l2 /' ~rn/bI.nt Now a calculation quantity is introduced: the 'thermal current' lth. T(t) - Tarn,,t with It, f A.a = -. fh(t) Figure 4.4 II 1I I I I f tnp-2 ttrip-1 t " Warming up to trip temperature Figure 4.5 shows the relation between the trip time and the temperature for different preload currents. - thermal current This leads to the basic equation for the 3parameter thermal model: For electric network components the maximum allowable current is: with , , I k hC - maximum allowable current - safety factor - full load current 6, When the current exceeds k . the temperature will rise to the maximum allowable tem~erature Ttnp.At this time point MFR 7SJ551 wili trip the electric component. In the model this is represented by: Figure 4.5 ~ h e j w ( , $ r n i tcurve I~IC Another way of expressing the trip condition is by using the remaining thermal capacity Bth: Ith= k . Ific Filling in the'basic equation for the thermal model gives: with eth - thermal reserve For T = Ttnpthe thermal reserve is 0%: I - I Method of operation MFR 7SJ551 With this we have completed the single-body model. It is built with the three parameters lRcrk and The single-body model can be represented by an electric analogon (refer to figure 4.6): Figure 4.7 Electric analogon for two-body model The following solution for T(t) is achieved: Figure 4.6 Electric analagon for single-body model with 71 - ambient temperature - warming-up time constant of mi . Ci material 1, T, = - 72 - P - weighing factor representing the Tamb 4.2.1.2 Two-body thermal overload model The single-body model is reasonably accurate for homogenous bodies. When bodies consist of different materials, like copper and iron the singlebody can be insufficient. MFR 7SJ551 therefore provides the possibility to simulate the thermal behaviour of an electric network component more accurately with a two-body model. This makes it possible to utilize the network component to the full because the overload protection can be set more critical, avoiding premature tripping. A1 . a1 warrning-up 'time constant of 2 ' " - C2 material 2, Z* = A2 - a2 mutual warrning-up influence of the two materials of the body In analogy with the derivation of the thermal current of the 3-parameter model we obtain the basic equation for the 5-parameter thermal model: From: Pheat~ng . --m . C . - dT dt we can see that for a body with two different materials with thermal warming-up capacities C, and C2 a differential equation for T consisting of two differential parts is applicable. The 5-parameter model can be derived in the same manner as the 3-parameter model and results in the following electric analogon (refer to figure 4.7): For T = T,,, the remaining thermal reserve is 0% Ith= k . Iflc or: eth(ttrip) = k2 ' 6~ - 1&,(ttrip).10Ooh = 0% k2 . lFlc With this y e have completed the two-body model. It is b u i l W , h e five parameters lfl,, k, z,, z2 and p. 4.2.2 Rotor thermal overload protection I I r Method of operation The rotor thermal overload protection is available when the user chooses the rotating device parameter set. Although the two thermal overload functions work at the same time, the rotor thermal overload protection protects the rotor completely independent from the stator thermal overload protection. It uses a separate thermal memory, represented during operation by the separate display quantity 'rotor thermal reserve'. The rotor thermal overload protection primarily acts on higher currents during start, during which the rotor thermal reserve decreases. When the motor has passed a successful start and is running at full load current the rotor thermal reserve will increase again according to the changes of the nominal temperature. When putting the operating condition from MFR 7SJ551 from 'off line' to 'on line' the thermal memory is initiated at 0%. MFR 7SJ551 computes the temperature rise of the rotor according to the single-body model. The rotor safety factor and the rotor warming-up time constant are computed indirectly out of the motor manufacturer data. Under assumption that the start-up time is much smaller than the rotor warming-up time constant the following formulas can be derived: In the rotor model the equivalent heating current is introduced. This current can be calculated according to the following formula: with Iheating - equivalent heating current - normal component of the three ,,,I phase currents kin, - inverse factor representing the extra warming up due to asymmetric currents linv - inverse component of the three phase currents The calculation of,,,I and I, depends on how many current phases are connected. For threephase connection,,,I and li, are calculated with the symmetric components method. As direction of the vectors either 'clockwise' or 'counterclockwise' can be externally selected by means of a binary input. When the direction is reversed, the calculation of the inverse current and the calculation of the normal current are reversed, too. For two-phase connection the following formulas are applicable: with , , I lmin - the largest of the two phase currents the smallest of the two phase currents The rotor thermal model basic iterative equation becomes (motor status 'start' or 'running'): with krOtor - rotor safety factor n, - permissible number of starts from cold condition , , ,n - permissible number of starts from warm condition T,,,,, - (fictive) rotor warming-up time constant ,,,,t - start-up time at nominal voltage 1~ I C - full load current ,,I - start-up current at nominal voltage with Ith,rotor - thermal rotor current MFR 7SJ551 calculates the thermal rotor current periodically and compares it with k,, lRc. When these quantities are equal, the tripping condition is fulfilled: These relations for the rotor safety factor and the rotor warming-up time constant express the influence of the slip on the rotor warming-up during start. with eth,rotor - rotor thermal reserve MFR 7SJ551 I For currents higher than,,,k, reserve will decrease to 0%. Method of operation . Incthe rotor thermal Theoretically, with this rotor thermal model formed tstart,ncoldand, , ,n we achieve that we with can start and stop the motor exactly nColdtimes from cold motor condition with a (constant) starting current,,,I , when we let each start last exactly t,~, without pausing between the starts. Than the thermal reserve will be exactly 0%. From the formula for, , , ,T it follows that MFR 7SJ551 allows a motor to be started from cold condition more of-ten,than qcoid.For example, when the starting time is halved for each start, or when the starting current is halved, the motor may be started 2 nColdfrom cold condition! The same accounts for starts from warm condition. @ When the motor status is 'stopped' the basic iterative equation changes to: 4.2.3 0 t l~h,rot,,(t) = (lth,roto,(t 2 = 0) - - with e C**m''mOr + /:eating rotor cooling down factor Cooling down the rotor to the original temperature after switching if off takes csto,,t times longer than warming it up to the original temperature. As soon as the thermal reserve reaches 0% the rotor thermal overload protection will step into the TRlP condition. The TRlP LED and the output relay TRlP 8th will be energized. When the auxiliary voltage drops out during on line operating condition and is switched on after a certain amount of time, the contents of the thermal memory is calculated using the real time clock as if the motor had stopped during this time, i.e. as if lheating was zero. Stator thermal overload protection The stator thermal overload protection is available when the user chooses the rotating device parameter set. Although the two thermal overload functions work at the same time, the stator thermal overload protection protects the stator completely independent from the rotor thermal overload protection. It works with a separate thermal memory, represented during operation by the separate display quantity 'stator thermal reserve'. The stator thermal overload protection primarily acts on relatively low overcurrents when the motor is running. When the motor passes a successful start and is running at full load current the stator thermal reserve will decrease to an equilibrium level. with When putting the operating condition from the MFR 7SJ551 from 'off line' to 'on line' the thermal memory is initiated at 0%. MFR 7 ~ ~ 5 calculates 51 the thermal stator current When periodically and compares it with kStat lflc. these quantities are equal, the tripping condition is fulfilled: %,stat (t) = (fh,stat(t = 0) - l2 . Ith,stat - thermal stator current - highest true root mean square I value of the phase currents Pweight - weighing factor T,~,, - stator warming-up time constant 1 ~ 2 , ~ ~ ~stator t warming-up time constant 2 . MFR 7SJ551 computes the temperature rise of the stator according to the two-body model, 2 Oth,stat (ttrip) using as measuring input the highest true root mean square value of the phase currents. The stator thermal model basic iterative equation becomes (motor status 'start' or 'running'): = . k : t a t ~ ~ ~ ~ c - I t , s t a t ( f t ~0% ~).~~~~ 2 Gat with eth,stat , ,k IR C - . lflc o = stator thermal reserve stator safety factor full load current For currents higher than,,k, . lflcthe stator thermal reserve will decrease to 0%. I Method of operation MFR 7SJ551 LED'S PRE-ALARM and ALARM and the output relay PRE-ALARM will annunciate this condition. This makes it possible to reduce load in an early stage. When the motor status is 'stopped' the basic iterative equation changes to: t Cstop.aa'i.stat with t + (A - , ) w e~ght . Cstop,statTa.stat + 12 c,~~,,,,~~ - stator cooling down factor Cooling down the stator to the original temperature after switching if off takes c,~~,,,~,~ times longer than warming it up to the original temperature. When the stator thermal reserve decreases under ,w, the stator thermal overload the warning level ,O protection will step into the ALARM condition. The 4.2.4 As soon as the thermal reserve reaches 0% the stator thermal overload protection will step into the TRlP condition. The TRlP LED and the output relay TRlP Oth will be energized. When the supply voltage drops out during on line operating condition and is switched on after a certain amount of time, the contents of the thermal memory is calculated using the real time clock as if the motor had stopped during this time, i.e. as if, , I was zero. Thermal overload protection of transformers, blow-out coils and cables When the user chooses the non-rotating device parameter set one thermal overload protection function is available. It works with a thermal memory, represented during operation by the display quantity 'thermal reserve'. The thermal overload protection is meant primarily for protection against relatively low overcurrrents when the electric network component is loaded to a maximum. When the network component is operated at full load current the stator thermal reserve will decrease to an equilibrium level. When putting the operating condition of the MFR 7SJ551 from 'off line' to 'on line' the thermal memory is initiated at 0% MFR 7SJ551 computes the temperature rise of the network component according to the fiveparameter model, using as measuring input the highest true root mean square value of the phase currents. MFR 7SJ551 calculates the thermal current periodically and compares it with k . llc.When these quantities are equal, the tripping condition is fulfilled: 2 Oth(t trip) with Oth k IRC = k 2 c 2 t t i , ooy k2 . o = - thermal reserve safety factor - full load current For currents higher than k . IRcthe thermal reserve will decrease to 0%. When the binary input 'z adjust' is energized, the basic iterative equation changes to: The thermal model basic iterative equation becomes: -- t 1 with Cadj + (1 - pweight . ) .e - adjustment factor for warming-up time constants with It, I - thermal current - highest true root mean square value of the phase currents Pweig~- weighing factor 71 - warming-up time constant 1 72 - warming-up time constant 2 For a constant input current this means that the time it takes to warm up is cadi times larger than for inactive binary input '7 adjust'. This can be used for example for network components with forced cooling. When the cooling is switched on larger warming-up time constants are needed. When the thermal reserve decreases under the warning level ,,,,e the thermal overload protection MFR 7SJ551 @ M e t h o d of o p e r a t i o n will step into the ALARM condition. The LED'S PRE-ALARM and ALARM and the output relay PRE-ALARM will annunciate this condition. This makes it possible to reduce load in an early stage. As soon as the thermal reserve reaches 0% the thermal overload protection will step into the TRIP condition. The TRlP LED and the output relay TRlP €IU, will be energized. Am Men%temperature biasing (optional) 4.3 4.8): for nominal ambient temperature T, With the function ambient temperature biasing the thermal reserve can be adjusted according to the actual ambient temperature. Therefore a sensor measuring the ambient temperature is necessary. The sensor is connected to one of the temperature sensor inputs of the (optional) interface unit. @ When the supply voltage drops out during on line operating condition and is switched on after a certain amount of time, the contents of the thermal memory is calculated using the real time clock as if the network component was unloaded during this time, i.e. as if I was zero. the thermal reserve is 100%. When the ambient temperature increases to a maximum allowable level,,T , the thermal reserve of the network component decreases to 0%. When the ambient temperature decreases below nominal ambient temperature Tmi, the thermal reserve will be larger than 100%. We consider a cold network component, i.e. the preload is 0%, without load current (refer to figure Carnbient 0% (b 1 Tm, Tunbtenl + Figure 4.8 min Tmax -Tmin - k2 - I& Offset in cold condition For a warm network component under load condition the temperature rise caused by electrical heating and the ambient temperature rise are added. Ambient temperature biasing causes the thermal current to increase with an amount proportional to the ambient temperature rise: fh,ambient i - MFR 7SJ551 calculates the thermal load current per~odicallyand compares it with k . IRc.When these quantities are equal, the tripping condition is fulfilled: 0 4.4 ambient with lth,ambie-,t - thermal load current adjusted with ambient temperature Ith - thermal load current Camblent - thermal load adjustment to ambient temperature Tarnbient- measured ambient temperature k - overload factor lflc - full load current \ Tm,, -- th with Oth tt,, -k - 2.2 2 Iflc - Ith.mb1ent , I 00% = 0% k2 . lflc - thermal reserve - trip time This trip time calculation applies to thermal overload protection for non-rotating objects as well as rotor thermal overload protection and stator thermal overload protection. (t) = ~ ? h=( ~O) + Carnbient Start inhibit After the thermal overload protection has tripped, the motor has to cool off before it can be put in operation again. The start inhibit function can be used to prevent the motor from being started until it has regained sufficient thermal reserve. For that purpose MFR 7SJ551 energizes a start inhibit . Method of o~eration I MFR 7SJ.551 output relay that must be used to prevent the circuit breaker from being closed. As long as the motor is to warm to complete a start this signal will make it impossible to start it. (Only the emergency restart function makes it possible to override this signal.) For the rotor thermal overload model a new start of the motor is blocked until the thermal reserve has increased to the rotor start inhibit level emlor: @rotor - temperature with ,,,8, I ,,,k, Ific t , , , ,T trip Figure 4.9 st art release t Start inhibit principle - rotor start inhibit level permissible start-up current overload factor rotor - full load current - permissible start-up time - thermal time constant rotor For the stator thermal overload model a new start of the motor is blocked until the thermal reserve has increased to the settable stator start inhibit level %tatorThe time until the start inhibit output is released can be extended with the start inhibit release time tinh.The two thermal models (rotor and stator) serve both at the same time as input for determining whether a start can be released. ~ p a h from that an additional delay time can be set. When the motor is stopped (automatically or manually) and at that moment the remaining rotor or stator thermal capacities are smaller than the respective rotor or stator inhibit levels a new start of the motor is blocked. 4.5 Emergency restart The emergency restart function can only be activated in combination with the start inhibit function. The emergency restart function makes it possible to override the start inhibit blocking signal by energizing the emergency restart binary input. By energizing this binary input the thermal rotor reserve and the thermal stator reserve are set back to 1OOO/!,thus releasing the start inhibit output. This means that a new start is released in spite of the possible danger of reaching a too high temperature of the motor! The function is only 4.6 meant for use in situations where the motor is less important than the process it is driving. The user only has to activate the function emergency restart, no parameters need to be set. The emergency restart order will be executed wHen the emergency restart binary input is energized while the motor status is 'stopped' and the thermal reserve is smaller than the start inhibit level. Together with the start inhibit output the LED 'start inhibit' will be deactivated. Locked rotor protection The locked rotor protection protects the motor from damage caused by excessively long start-up. This may occur when, for example, the rotor is locked, the driving torque is too high, or impermissible voltage break down occurs. If the permissible start-up time is longer than the permissible locked rotor time the locked rotor protection function is inadequate: then the zero speed function has to be used (refer to section 4.7). The tripping time depends on the magnitude of the largest phase of the starting current. The following formula is valid: Method of operation MFR 7SJ551 7SJ551 energizes the locked rotor (trip) output. If the motor status becomes 'running' or 'stopped' the locked rotor function becomes inactive. with ttip ,,I I qr - tripping time permissible start-up current motor current (largest phase) locked rotor time The locked rotor protection only works during start. If the motor status stays 'start' during ttip, MFR 4.7 Zero speed protection The zero speed function protects the motor from damage caused by a locked rotor, when the permissible start-up time is longer than the permissible locked rotor time. In that case the locked rotor protection cannot be used and a binary tachometer built in the motor has to provide a zero speed signal. This signal is connected to the zero speed binary input. 4.8 The zero speed protection only works during start. When the motor is starting and the rotor is stalled, the binary tachometer energizes the zero speed binary input and the zero speed protection function jumps into the alarm condition. If the binary input stays energized during the detection time,,,t the zero speed (trip) output will be energized. Motor start-up protection Three different protection functions work at the same time to protect the motor against overheating during start-up: stator thermal overload protection e rotor thermal overload protection locked rotor protection By showing an example case the method of operation of the start-up protection will be explained. @ The formula for the locked rotor protection allows starting for a longer time for smaller starting currents. This is a practical situation: when the motor is started with lower motor voltage, the starting takes longer, but the starting current is smaller. From rest condition ('stopped') MFR 7SJ551 recognises a start-up when the motor current is higher than the top current ,,I (refer to figure 4.10): status becomes 'running'. When the motor is overloaded now to current values higher than ltop the motor status will stay 'running': it can only become 'start' again when it becomes 'stopped' first. if the motor current gets smaller than motor status becomes 'stopped' again. O 'no load - top current full load current The motor status will become 'start'. It stays 'start' as long as the motor current is larger than .,,I From start condition MFR 7SJ551 recognises a normal running state when the motor current crosses ,I downwards again; then the motor Itop 'stan - 1 Figure 4.1 0 with ,,I lfic Ilk the Motor status Normal starting behaviour for most motors is that the motor current jumps to the starting current very fast. As the rotor slowly begins to turn the motor current slowly decreases. The more turning speed the rotor achieves, the faster the motor current decreases, until it reaches normal load level (refer to figure 4.1 1). i " I Method of operation MFR 7SJ551 normal starting behaviour . \ rotor thennal overload curve . - -:-- - ----.---., -stator K I rotor Figure 4.1 1 Normal starting behaviour Figure 4.13 Rotor thermal overload curve during start The stator thermal overload protection primarily acts on relatively low overcurrrents when the motor is running. It becomes active for currents higher Iflc(refer to figure 4.12). than ,k, stator thermal -overload curve stator rotor normal Figure 4.1 4 Figure 4.12 Stator thermal overload curve during start The rotor thermal overload protection primarily acts on higher currents during start. In most cases (for start from cold condition) the rotor thermal overload protection will trip earlier than the stator thermal overload protection (refer to figure 4.1 3). When the manufacturer data prescribe a maximum locked rotor time (often denominated t,) the locked .rotor protection can be activated. The locked rotor protection is active only during motor status 'start'. For a start from cold condition the locked rotor curve will earlier cause a trip in most cases than the rotor and stator thermal overload curves (refer to figure 4.1 4). Locked rotor curve When the motor passes a successful start and is running at full load current the rotor and stator thermal reserves will decrease to an equilibrium level (refer to figure 4.15). The locked rotor curve is inactive when the motor status is 'running'. Notice that the rotor and stator thermal curves are not 'rigid': they 'float' to equilibrium depending on the magnitude the load current. When the motor is stopped now the remaining rotor and stator thermal capacities will slowly increase again from equilibrium level (refer to figure 4.1 6). Only after a long time the motor will have cooled off completely and the rotor and stator thermal reserves will be back at 100%. " f MFR 7SJ551 Method of operation ' a t I ! . .. . , , kstaor x 111, ... . . . krotor Figure 4.15 x liis I> kstaor x lhc , krotor X lric I> lnm Running at nominal current Figure 4.17 Start from warm condition If the rotor would lock at this moment, i.e. motor current will stay at,,,I level, the stator thermal overload function will trip the motor (refer to figure 4.1 8). - - - - - - - - - _ _ _ _---_ -- - - -.. -....-_._...-_ ./ _ ---- - - Figure 4.1 6 : rotor ---. ..-2 locked rotor Stopped motor in warm condition stator Q I i If we would start again shortly after stopping the motor, the rotor and stator thermal reserves will not have increased noticeably. Figure 4.17 shows the start from this warm condition. The 'rigid' locked rotor protection curve is activated again but in this case it is no longer the first function which trips the motor. 4.9 Unbalance protection 4.9.1 General MFR 7SJ551 is equipped with unbalance protection, protecting all electric network components against phase unbalance. Furthermore, the unbalance protection detects interruptions, short-circuits and swapped phase connections of the current transformer circuits. Single-phase and two-phase short-circuits can be detected even when the fault current is too small to be detected by the overcurrent protection. Figure 4.1 8 Blocked rotor in warm condition For three-phase connection MFR 7SJ551 filters out the fundamental wave of the phase currents and separates it into symmetrical components (negative The sequence ,il and positive sequence.),,,I unbalance protection evaluates the magnitude of linv. The sequence of connections can be externally selected either clockwise or counterclockwise, by means of a binary input. When the sequence direction is reversed, the calculation of the inverse current and the calculation of the normal current are exchanged. - 6 MFR 7SJ551 ! Method of operation For two-phase connection the following formula is applicable: with ,il - inverse component of the phase currents ,,I - the largest of the two phase currents lmi, - the smallest of the two phase currents When the negative sequence current exceeds the unbalance pick-up the unbalance protection jumps into the alarm condition. Then every sample period the tripping time is calculated according to an extremely inverse characteristic: 4.9.2 Unbalance protection of motor* The unbalance protection especially protects motors switched by vacuum contactors with -associatedfuses. When running on single phase the motor develops small and pulsating torques. With unchanged torque load the motor will quickly be thermally overloaded. Furthermore, thermal overloading of the motor can arise by asymmetrical system voltage. Even small unbalanced system voltages may lead to large slip load currents because of the small negative sequence reactances. During start-up (motor status is 'start') unbalance may occur because of closing time differences of the circuit breaker phase contacts. Tripping the motor for this reason is undesirable, therefore for 'rotating objects' MFR 7SJ551 provides the possibility to set a delay time fbypass. This bypass 1 time is started at the moment the motor status changes from 'stopped' to 'start'. During the bypass time the unbalance protection is inactive. a with ti, - tripping time IPp - unbalance pick-up tPD - unbalance time multiplier When the inverse current stays larger than the unbalance pick-up during the tripping time, the unbalance (trip) output is energized. The passed time is distracted from the calculated actual tripping time. When the inverse current becomes smaller than the pick-up value, the unbalance function jumps back into the 'no alarm' condition. When the motor status is still 'start' after the bypass time has expired, pick-up takes place with I"' , (with ,,I the root mean square value of the 3 largest phase current) in stead of 12p. When one phase drops out during start this is detected immediately because the inverse current will be larger than then. The calculation of the 3 tripping time stays unchanged (withthe original unbalance pick-up IPp). After the motor status has changed to 'running' the function picks up with .12, 1 4.1 8 Undercurrent protection 1 4.1 0.1 General The undercurrent protection protects network components against a decrease in current flow. For motors this can be caused by a loss of or decrease in motor load. Examples of such situations are: loss of suction of pumps, loss of airflow for fans or a broken belt in conveyors. Because the cooling is limited severely these situations may result in excessive overheating of the motor, even when the motor is protected by (current dependent) thermal overload protection. For non-rotating objects the most customary application of undercurrent protection is the protection of capacitor banks against their being switched on. Only when the undercurrent protection picks up (no remaining capacitive current) the circuit breaker may be closed (figure 4.1 9). For the undercurrent protection MFR 7SJ551 computes the fundamental wave of the phase currents. " c MFR 7SJ551 Method of operation 4.1 Q.2 Figure 4.1 9 Protection of capacitor banks Motor undercurrent protection Before start-up (motor status is 'start') the current is zero: this is a pick-up condition for the undercurrent protection. Tripping the motor for this reason is undesirable, therefore for 'rotating objects' the undercurrent protection is inactive when the motor status is 'stopped'. During operation the function can be blocked dynamically via a binary input even during pick up of the protection. Refer to section 4.1 9 'Block' for detailed information. Furthermore, MFR 7SJ551 provides the possibility to set a delay time tbypass.his bypass time is started at the moment the motor status changes from 'start' to 'running'. During the bypass time the undercurrent protection function is inactive. Each phase current is compared with the pick-up e I< which is applicable for all three phases. ck-up is separately indicated for each phase. .'ick-up occurs when the measured value is smaller than the pick-up value. After pick-up the undercurrent protection jumps into the alarm condition and the delay timer is started. After the delay time ti< has elapsed the undercurrent (trip) output is energized. When the phase currents become larger than the pick-up value, the undercurrent protection function jumps back into the 'no alarm' condition. If the motor status is 'running' during the bypass time and after expiration of the bypass time all phase currents decrease under the undercurrent pick-up value I<, the undercurrent protection function jumps into the alarm condition. If the motor status stays running and all phase currents stay smaller than the undercurrent pick-up value I< during tlc, the undercurrent (trip) output is energized. When the phase currents become larger than the pick-up value or if the motor status becomes 'stopped', the undercurrent protection function jumps back into the 'no alarm' condition. e Overtemperature protection (optional) 4.1 1 MFR 7SJ551 provides the possibility to measure the temperature of network components directly. This is especially useful for protecting nonparts of network components against erheating. For overtemperature protection temperature sensors are necessary. The sensors is connected to the temperature sensor inputs of the (optional) interface unit. Depending on the ordered type the interface unit has 2 or 8 inputs for temperature sensors. Temperature sensors are normally mounted in: - bearings, stator windings, - transformer cores, coolants, lubrication oil. - For each temperature sensor an alarm pick-.up and a trip can be set individually. Pick-up values of 999 "C should be set to prevent unwanted pick-ups of an unused temperature sensor. When one of the temperatures exceeds the corresponding alarm pick-up value the overtemperature protection function jumps into the alarm condition. When one of the temperatures exceeds the corresponding trip pick-up value the overtemperature protection (trip) output is energized. When all temperatures become smaller than the alarm pick-up value, the overtemperature function jumps back into the 'no alarm' condition. bow set overcurrent protection 4.1 2 m Temperature sensor inputs that are not connected to a temperature sensor should be closed with a resistor (50 - 100 a)to maintain the display value. e low set overcurrent protection protects network lomponents against high impedance short-circuits. 07 It can be used as definite time or inverse time overcurrent protection. Three standardized inverse G88700-C3527-07-7600 1 I " I Method of o~eration MFR 7SJ551 time characteristics are available for inverse time mode. In addition, a user specified characteristic (custom curve) can be defined. Two more characteristics are available for earth faults. The trip time characteristics and the applied formula are given in the Technical data, refer to section 3.1 1. For phase currents and for earth currents separate characteristics can be set. For the low set overcurrent protection MFR 7SJ551 computes the fundamental wave of the phase and earth currents. During operation the characteristics can be switched over or blocked dynamically via binary inputs even during pick-up of the protection. By switching over to an instantaneous characteristic (delay time is zero) rapid trip is provided. Refer to section 4.1 4 'Curve switch' and section 4.1 9 'Block' for detailed information. The measured currents are fed to the relay via the input transducers for each phase. The inputs are galvanically isolated against the electronic circuits as well as against each other. To the earth current input either the residual current of the phase current transformers or a separate summation current transformer can be connected. The earth current input is either a regular earth current input (for high magnitude earth currents) or a sensitive earth current input (for low magnitude earth currents). 4.1 2.1 Definite time overcurrent protection Each phase current is compared with the pick-up value I> which is applicable for all three phases. Pick-up is separately indicated for each phase. Pick-up occurs when one of the phase currents exceeds the pick-up value. After pick-up the overcurrent protection jumps into the alarm condition and the delay timer is started. After the delay time tl> has elapsed the overcurrent (trip) output is energized. When the phase currents become smaller than the pick-up value, the low set overcurrent protection function jumps back into the 'no alarm' condition. The residual (earth) current is processed separately and compared with the earth overcurrent pick-up value I,>. The delay time tie> can be set individually. 4.1 2.2 Inverse time overcurrent protection Each phase current is compared with the pick-up value I, which is applicable for all three phases. Pick-up is separately indicated for each phase. Pick-up occurs when one of the phase currents exceeds the pick-up value. After pick-up the overcurrent protection jumps into the alarm condition and the trip time delay is calculated from the inverse time characteristic and the magnitude of the fault current. The passed time is distracted from the calculated actual delay time. After the calculated delay time has elapsed the overcurrent (trip) output is energized. When the phase currents become smaller than the pick-up value, the low set overcurrent protection function jumps back into the 'no alarm' condition. The residual (earth) current is processed separately and compared with the earth overcurrent pick-up'value .,I The earth overcurrent characteristic may differ from the phase overcurrent characteristic; the associated parameters can be set individually. 4.1 2.3 Custom curve overcurrent protection When the definite or inverse time overcurrent protection function cannot cover the short-circuit characteristic of the network component a user specified characteristic can be defined. Minimum 2 and maximum 15 I-t co-ordinates (I, ... Il5) can be defined. The MFR 7SJ551 will construct an I-t curve by using these co-ordinates and assuming straight lines between the co-ordinates. Each phase current is compared with the pick-up value I, which is applicable for all three phases. Pick-up is separately indicated for each phase. Pick-up is separately indicated for each phase. Pick-up occurs when one of the phase currents exceeds the pick-up value. After pick-up the overcurrent protection jumps into the alarm condition. The trip time delay is calculated every sample period out of the line drawn between the two I-t co-ordinates that lie closest to the measured current. The passed time is distracted from the calculated actual delay time. After the calculated delay time has elapsed the overcurrent (trip) output is energized. When the phase currents become smaller than the pick-up value, the low set overcurrent protection function jumps back into the 'no alarm' condition. The residual (earth) current is processed separately and compared with the earth Method of operation MFR 7SJ551 overcurrent pick-up value Iel. The earth overcurrent characteristic may differ from the phase 4.1 3 overcurrent characteristic; the associated parameters can be set individually. High set overcurrent protection The high set overcurrent protection protects network components against low impedance shortcircuits. overcurrent pick-up value I,>>. The delay time tie>> can be set individually. For phase currents and for earth currents separate parameters can be set. For the high set overcurrent protection MFR 7SJ551 computes the fundamental wave of the phase and earth currents. During operation the characteristic can be switched over or blocked dynamically via binary inputs even during pick-up of the protection. By switching over to an instantaneous characteristic (delay time is zero) rapid trip is provided. Refer to section 4.14 'Curve switch' and section 4.1 9 'Block' for detailed information. The measured currents are fed to the relay via the input transducers for each phase. The inputs are galvanically isolated against the electronic circuits as well as against each other. For the earth current input either the residual current of the phase current transformers or a separate summation current transformer can be connected. The earth current input is either a regular earth current input (for high magnitude earth currents) or a sensitive earth current input (for low magnitude earth currents). @ 4.1 3.1 The high set overcurrent protection can be blocked via a binary input of the relay. A setting parameter determines whether the binary input operates in the normally open mode (i.e. energize input to block) or in the normally closed mode (i.e. energize input to release). Thus the high set overcurrent protection can be used as a fast bus bar protection in star connected networks or in open ring networks (ring open at one spot), using the reverse interlock principle. This is used in high voltage systems. Reverse interlocking means that the high set overcurrent protection can trip within time tl>>, which is independent of the low set overcurrent protection time tl> if it is not blocked by pick-up of one of the next downstream feeder protections (figure 4.*). Therefore, the protection which is closest to the fault will always trip within a short time, as it cannot be blocked by a relay behind the fault location. The low set overcurrent time stages tl> or I, operate as delayed back-up stages. Each phase current is compared with the pick-up value I>> which is applicable for all three phases. Pick-up is separately.indicated for each phase. Pick-up occurs when one of the phase currents exceeds the pick-up value. After pick-up the high set overcurrent protection jumps into the alarm condition and the delay timer is started. After the delay time tl>> has elapsed the high set overcurrent (trip) output is energized. When the phase currents become smaller than the pick-up value, the high set overcurrent protection function jumps back into the 'no alarm' condition. The residual (earth) current is processed separately and compared with the high set earth 4.14 Curve switch Fast bus bar protection using the reverse interlock scheme I Figure 4.20 - tfault detectic - & fault detectic Reverse interlock principle MFR 7SJ551 With the curve switch function MFR 7SJ551 provides the possibility to adapt the overcurrent characteristics during motor or transformer inrush by setting the pick-up values higher. Furthermore, by switching over from a time delayed to an instantaneous characteristic (delay time is zero) rapid trip is provided. For low set overcurrent protection and for high set overcurrent protection two sets of I-t co-ordinates can be defined. With the curve switch function the MFR 7SJ551 can be parametrized to use set 1 or set 2, controlled by motor status or a binary input. Three curve switch modes can be selected: continuous mode: MFR 7SJ551 switches from curve 1 to curve 2 during the activation of the curve switch binary input, 4.65 Method of operation - - pulse mode: MFR 7SJ551 switches from curve 1 to curve 2 during the curve switch time tcs, after the activation of the curve switch binary input, status mode (only for motors): depending on motor status MFR 7SJ551 automatically switches from curve 1 to curve 2. For the status mode two different options can be selected: status = stopped/start: when the motor status is 'stopped' or 'start' curve 2 is active, when the motor status is 'running' curve 1 is active, e status = running: when the motor status is 'running' curve 2 is active, when the motor status is 'stopped' or 'start' curve 1 is active. Directional earth fault protection (optional) The directional earth fault protection can be used in isolated or arc compensated networks to discriminate the earth fault direction. Trip commands for earth fault overcurrent will only be activated if the direction of the earth fault current corresponds with the selected direction. The residual voltage Uo is one of the two conditions for release of the directional determination. Uo is the voltage measured at the terminals of an open delta voltage transformer. In order to detect earth currents, the two-stage low set overcurrent protection (refer to section 4.12) or high set overcurrent protection (refer to section 4.1 3) must be set. When the earth fault direction function is enabled, the denomination of the pickup values changes to I d , I+, and I+> (in stead of 12, ,,I and I,>>). The earth fault direction protection does not process the magnitude of the earth current but the component which is at right angle to a settable directional symmetry axis. A precondition for determination of the fault direction is that one of the current magnitude stages has picked up and that the residual voltage exceeds the displacement voltage. When the measured residual voltage Uo exceeds the pick-up value Us, during the pick-up delay tUSt, the directional determination is released. The directional earth fault protection picks up as soon as - the directional determination is released - the earth fault direction current exceeds the overcurrent threshold value I p - the direction of the earth fault is in the selected direction. The trip delay time is calculated according to the selected time characteristic. After pick-up the directional earth fault protection jumps into the alarm condition and the delay timer is started. After the delay time t l p has elapsed the directional earth fault (trip) output is energized. When the zero sequence voltage Uodecreases below ,U , or when the earth fault direction current I, decreases below lp or when the direction changes, the directional earth fault protection function jumps back into the 'no alarm' condition. The same is valid for the inverse time characteristics and for the high set overcurrent stage IG>. 4.1 5.1 Cos $ determination For resistance-earthed networks or networks earthed with a Petersen coil cos 41 determination is used. When an earth fault occurs the Petersen coil superimposes a corresponding inductive current on the capacitive earth fault current, so that this capacitive current at the fault spot is compensated. However, dependent upon the point of measurement in the network the resultant " € MFR 7SJ551 sured current can be inductive or capacitive eht ! ! ! reactive current is therefore not suitable for the determination of direction. In this case only the ohmic residual current which results from the losses of the Petersen coil can be used for directional determination. This earth fault ohmic current is only a few percent of the capacitive earth fault current. Method of operation with P - active power in the earth current path Uo - residual voltage - earth current I, I$ - component of the earth current which is at a right angle with the directional symmetry axis It must be noted that, dependent upon the location of the protective relay, a considerable reactive component may be superimposed, which, in the most unfavourable cases, can attain a value of fifty times the value of the active component. Despite the extremely high accuracy the calculation algorithm is then inadequate if the current transformers do not exactly convert the primary values. I e se of cos 9determination the active power P is decisive factor. The direction is forwards if P is i .~ositive: The earth fault component is calculated according to the following formula: f I' capacif ive earth fault load inductive earth fault load backward Figure - Q 4.dp0' Sin 4.15.2 I I$ f o ~ y e ermination Sin $ determination For isolated networks sin I$determination is used. The earth fault current flows as capacitive current from the healthy lines via the measuring spot to the fault spot. This capacitive current determines the direction. In case of sin 9 determination the reactive power Q is the decisive factor. The direction is forwards if Q is positive. The earth fault component is calculated according to the following formula: MFR 7SJ551 with Q path Method of operation - reactive power in the earth current I '9 forward (Q>O) /7'~capaciy fault load earth inductive earth fault load I I Figure 4.22 4.15.3 Dependent of the value of the expected earth current I, the angular error of the core balance current transformer can be corrected in three ranges: 0 backward (Q<O1 Cos (g determination 4.15.5 Earth fault location By means of the directional indication the earthfaulted line in radial networks is located. Since all circuits on a bus bar carry a capacitive partial current, the measuring spot on the faulted line in a isolated network covers almost the entire prospective earth fault current of the network; in compensated networks the wattmetric residual current from the Petersen coil flows through the measuring spot. For the faulted line or cable a definite 'forwards' decision will result, whilst in the remaining circuit a 'reverse' indication will be given unless the earth current is so small that no measurement can be performed. In any case the faulted cable can be clearly determined. 0, Sensitivity improvement by shif ing the symmetry axis The symmetry axis can be shifted by up to t 4 5 " (settable rotation angle $, refer to figure 4.23). Thus it is possible to achieve maximum sensitivity. Correcting the angular error of 4.1 5.4 the core balance transformer The sensitive measurement input circuit of the relay for directional earth fault protection permits an extremely high sensitivity for the directional determination of the wattmetric residual current. In order to utilize this sensitivity it is recommended that a core balance current transformer is used for the earth fault detection. As even these transformers have an angle error, MFR 7SJ551 allows the setting of factors which, dependent on the reactive current, will correct the error angle. 4.1 6 backward IPc01 Figure 4.23 Undervoltage protection (optional) @w Shifting the symmetry axis , MFR 7SJ551 1 Method of operation The undervoltage protection protects network components against too low voltage. of the protection. Refer to section 4.1 9 'Block' for detailed information. For the undervoltage protection MFR 7SJ551 contains one voltage input. This means only one phase voltage can be measured. The user determines whether the measured voltage Ui, is a phase to phase voltage by parametrizing it as U,, a phase to earth voltage by parametrizing it as UP,, and a residual voltage by parametrizing it as Uo. The measured voltage is compared with the pickup value U<. Pick-up occurs when the measured value is smaller than the pick-up value. After pickup the undervoltage protection jumps into the alarm condition and the delay timer is started. After the delay time tU< has elapsed the undervoltage (trip) output is energized. When the measured voltage becomes larger than the pick-up value, the undervoltage protection function jumps back into the 'no alarm' condition. During operation the function can be blocked dynamically via a binary input even during pick-up MFR 7SJ551 4.1 7 Overvoltage protection (optional) The overvoltage protection protects network components against too high voltage. For the overvoltage protection MFR 7SJ551 contains one voltage input. This means only one phase voltage can be measured. The user determines if the measured voltage Ui, is a phase to phase voltage by parametrizing it to U,, a phase to earth voltage by parametrizing it to Uphand a residual voltage by parametrizing it to Uo. 8 For the low set stage the measured voltage is compared with the pick-up value U>. Pick-up occurs when the measured value exceeds the pickup value. After pick-up the overvoltage protection jumps into the alarm condition and the delay timer is started. After the delay time tU> has elapsed the 4.18 For the high set stage the measured voltage is compared with the pick-up value U>>. Pick-up occurs when the measured value exceeds the pickup value. After pick-up the overvoitage protection jumps into the alarm condition and the delay timer is started. After the delay time tU>> has elapsed the overvoltage (trip) output is energized. When the measured voltage becomes smaller than the pickup value, the overvoltage protection function jumps back into the 'no alarm' condition. Instead of by the algorithm described above, start of the breaker failure protection can be initiated by an external protection relay. The trip signal of the external protection device is coupled into MFR 7SJ551 via a binary input. The timer tbf is started. If the measured current is higher than a settable level Ibfafter tbf has elapsed, the breaker failure protection energizes the breaker failure protection relay output to cause the circuit breaker to clear the fault. The breaker failure protection function can only be deactivated if the measured current becomes smaller than Ibf. Block With the block function MFR 7SJ551 provides the possibility to block the overcurrent, undercurrent and undervoltage characteristics during motor or transformer inrush. Three block modes can be selected: continuous mode: MFR 7SJ551 activates the block function during the activation of the block binary input, pulse mode: MFR 7SJ551 activates the block after the function during the block time tBLOC~, activation of the block binary input, - 4.20 overvoltage (trip) output is energized. When the measured voltage becomes smaller than the pickup value, the overvoltage protection function jumps back into the 'no alarm' condition. Breaker failure protection In order to supervise correct functioning of the circuit breaker, MFR 7SJ.551 checks whether the current becomes zero after a trip signal has been given. When the trip command is generated a timer tbf is started. The timer continues to run for as long as the trip command is maintained. If the circuit breaker does not respond to the trip command the timer runs to its set limit. If the then measured current is higher than a settable level Ibfthe breaker failure protection energizes a second relay output to trip the upstream circuit breaker to clear the fault. 4.19 Method of o~eration External command - status mode (only for motors): depending on motor status MFR 7SJ551 automatically activates the block function. For the status mode two different options can be selected: status = stoppedlstart: when the motor status is 'stopped' or 'start' the block function is active, when the motor status is 'running' the block function is inactive, status = running: when the motor status is 'running' the block function is active, when the motor status is 'stopped1or 'start' the block function is inactive. MFR 7SJ551 With the external command function an immediate trip can be generated by activating a binary input, for example to make an emergency stop. 4.21 After the circuit breaker position binary input is activated the circuit breaker position LED indicator will be energized. Ancillary functions The ancillary functions of MFR 7SJ551 include: - processing of annunciations - storage of short-circuit data for fault recording - operational measurements - test routines - monitoring functions 4.22.1 After activating the external command binary input a delay timer ten is started. If the binary input the external continues to be activated during tm command output will be energized after Lxr has elapsed. Circuit breaker position With the circuit breaker position function the position of the circuit breaker can be indicated. 4.22 Method of operation Processing of annunciations After a fault in the protected component information concerning the response of the protective device and knowledge of the measured values are important for an exact analysis of the history of the fault. For this purpose the MFR 7SJ551 provides annunciation processing which is effective in three directions. Indicators and binary outputs (signal relays) Important events and conditions are indicated by optical indicators (LED) on the front pIate. MFR 7SJ551 also contains signal relays for remote signalling. All of the signals and indications can be marshalled freely. In section 6.1 1 the marshailing facilities are described in detail. The output relays can be arranged to latch or to be self-resetting. The general alarm LED, the prealarm LED and the general trip LED are memorized. The four freely programmable LEDs (optional) can be arranged to be memorized or to be self-resetting. The memories of the LEDs can be reset locally, by pushing the 'reset indicators' button (RI) on the front plate; - remotely, by energizing the remote reset binary input; - via the operating interface. - The latching of the output relays can be reset: - locally, by pushing the 'reset indicators' button (RI) on the front plate - remotely, by energizing the remote reset binary input - via the operating interface - automatically, after elapsing of a settable reset ti me Sometimes indicators and relays indicate conditions, which naturally should not be stored. In these cases the indicators cannot be reset until the originating criterion has disappeared. A green LED indicates readiness for operation ('on line'). This LED is illuminated when the microcontroller is working correctly, the unit is not faulty and performing its protection task. The LED extinguishes when the self-checking function of the microcontroller detects a fault or when the auxiliary voltaae is absent. The 'on line' LED will flash when theriis a non-fatal defect in the real time clock module, for example an empty battery. With the auxiliary voltage present but with an existing internal fault or with the unit in off line (programming) mode a red LED ('monitor') illuminates and the outputs will be blocked. Information on the display panel, t o a personal computer or t o a substation automation system Events and conditions can be either read off in the display on the front plate of the unit (using the keyboard) or transferred to a personal computer or a substation automation system connected to the serial interface (optional). MFR 7SJ551 outputs selectabte operating information like operational measured values or motor status and also contains several event buffers for operating messages or fault annunciations. The fault inception is indicated with the absolute time of the operating system. The sequence of events is tagged with the relative time referred to the pick-up time. I *, f MFR 7SJ551 Method of operation For using a personal computer or communication with a substation automation system the MFR 7SJ551 interface module has to be connected. This module can either be ordered together with the relay unit by choosing the appropriate ordering number (refer to section 2.3.1) or be ordered separately later on (refer to section 2.3.2). Normally no special arrangements are necessary to operate the relay after connecting the interface module. When the data are transmitted to a personal computer or to a substation automation system, read out can proceed automatically, optionally after pick-up or after trip. The following then applies: - the interface unit of the relay signals the availabijity of fault record data - the data remain available for recall until they are overwritten by new data - a transmission in progress can be aborted by the central unit of the control system. For setting and evaluating MFR 7SJ551 the personal computer has to be loaded with the software program 'Communication Utility MFR 7SJ551'. This allows the user to comfortably set the relay and analyze events and faults by means of systematic screen use and graphical aids. Additionally, the data can be documented on a printer or stored on a floppy disk. Alternatively, the fault recording can be triggered by applying an external binary input signal. The recording time is fixed a t ~ 3seconds, directly after the triggering. 4.22.3 Operational value measurements MFR 7SJ551 stores the data of the last three events; if a fourth event occurs the first event is overwritten in the event memory. For local recall or transmission of data, the first harmonic values of the phase currents, the earth current and the voltage (optional) are available. When the thermal overload protection is active, the calculated thermal resewe and the largest true root mean square current value can be read out. For motors the rotor thermal reserve, the stator thermal reserve and the motor status are displayed. With an interface unit containing RTD inputs the measured temperatures can be read out. One of the binary input signals can be transmitted via the serial interface ('serial event') to the substation automation system. 4.22.2 Fault event data storage and transmission (optional) The instantaneous values of the measured values are sampled at 1 ms intervals (for 50 Hz) and stored in a circulating shift register. In case of a fault, the data are stored over a selectable time period, with a maximum of 3 seconds. Only one fault record is stored at a time. If the interface unit is connected to the relay unit during the fault, the fault data are available for fault analysis. For each new event the old event is overwritten by the new fault data. The following items can be recalled: ' phase and earth currents in primary amperes voltage in primary volts thermal reserve in % largest true root mean square current value in primary amperes inverse current in primary amperes temperatures measured by the 2 or 8 RTD elements in degrees Celsius three possible modes: stop start - running - The data can be transferred to a connected personal computer via a serial interface (optic fiber or RS485, selectable) on the interface unit and evaluated by the 'Communication Utility MFR 7SJ551' program. The currents are referred to their maximum values, normalizes to their rated values and prepared for graphic visualization. - The fault record data can also be transmitted to a substation automation system via one of the serial interfaces. Evaluation of the data is made in the substation automation system, using appropriate software programs. The demand ampere meter allows the user to check correct dimensioning of network components and makes special external arrangements unnecessary. motor status 4.22.4 Demand ampere meter The demand ampere meter displays 1 - the dynamic 8 minutes average of the measured currents - the maximum 8 minutes average of the measured currents since the last reset - the dynamic 15 minutes average of the measured currents - the maximum 15 minutes average of the measured currents since the last reset. 1 Method of operation MFR 7SJ551 4.22.5 Test facilities MFR 7SJ551 allows simple checking of the tripping circuit and the circuit breaker as well as interrogation of the state of all binary inputs and outputs. Initiation of the test can be given from the front keyboard or via one of the serial interfaces with a personal computer. 4.22.6 Hardware monitoring MFR 7SJ551 incorporates comprehensive hardware monitoring functions. The hardware is monitored for faults and inadmissible functions, from the measured value inputs to the output relays. In detail this is accomplished by monitoring: - Auxiliary and reference voltages Failure or switch-off of the auxiliary voltage automatically puts the system out of operation; this status is indicated by the breaking contact of the 'monitor' relay and the illumination of the 'monitor' LED. Transient dips in supply voltage of less than 40 milliseconds (for rated auxiliary voltage higher than 110 V DC) will not disturb the functioning of the relay. Output channels The output relays are controlled by two command and one additional release channel. As long as no pick-up condition exists, the microcontroller makes a cyclic check of these output channels for availability, by exciting each channel one after the other and checking for change in the output signal level. Change of the feed-back signal to low level indicates a fault in one of the control channels or in the relay coil. This condition automatically leads to alarm and blocking of the output. - Memory modules After the relay has been connected to the auxiliary supply voltage, the RAM memory is checked by writing a data bit pattern and reading it. The further memory modules are periodically checked for fault by 0 formation of the modulus for the EPROM program memory and comparison of it with a reference program modulus stored there formation of the modulus of the values stored in the EEPROM parameter memory and comparison of it with a newly determined modulus after each parameter change. 1 MFR7SJ551 Installation instructions installation insbuctions A Warning The successful and safe operation of this device is dependent on proper handling and installation by qualified personnel under observance of all warnings and hints contained in this manual. In particular the general erection and safety regulations (e.g. IEC, DIN, VDE and the national standards) regarding the correct use must be observed. Non-observance can result in death, personal injury or substantial property damage. @ Unpacking and repacking When dispatched from the factory, the equipment is packed in accordance with the guidelines laid down in DIN 40046 part 7, which specifies the impact resistance of packaging. This packing shall be removed with care, without force and without the use of inappropriate tools. The equipment should be visually checked to ensure that there are no external traces of damage. It must also be checked whether the order number (on the top of the housing) of the relay corresponds with the ordered relay type. A possibly ordered optional interface unit will be packed separately, but shipped in the same box as the relay unit. The packing can be re-used for further transport en applied in the same way. If alternative packing sed, this must provide the same degree of grotection against mechanical shock, as laid down in DIN 40046 part 7 (class 23). F. 5.2 Preparations The operating conditions must comply with VDE 010015.73 and VDE 0105 part 117.83, or corresponding national standards for electrical power installations. /L, Caution! The modules of digital relays contain CMOS circuits. These shall not be withdrawn or inserted under live conditions! The modules must be handled in such a way that any possibility of damage due to static electrical discharges is excluded. During any necessary handling of individual modules the recommendations relating to the handling of electrostatically endangered components (EEC) must be observed. In installed conditions, the modules are in no danger. Installation instructions MFR 7SJ551 5.2.1 Mounting and connections Panel flush mounting or cubicle installation - Lift up both the labelling strips on the lid of the unit and remove the cover to gain access to the four holes for the fixing screws. - lnsert the unit into the panel cut-out and secure it with the fixing screws. For dimensions refer to figure 2.3. - Connect the earthing screw on the rear of the relay unit to the protective earth of the panel or the cubicle. - Make a solid low-ohmic and low-inductive operational earth connection between the earthing surface at the rear of the unit using at least one standard screw M4 and the earthing continuity system of the panel or cubicle; recommended grounding strap DIN 72333-form A, e.g. order number 15284 of Messrs Druseidt, Remscheid, Germany. - Make connections via the screwed or snap-in terminals of the sockets of the housing. Observe labelling of the individual connector modules to ensure correct location: observe the maximum permissible conductor cross-sections. The use of the screwed terminals is recommended; snap-in connection requires special tools. Auxiliary voltage The auxiliary supply voltage is 24V60VDCor - 110V- 250VDCand110V-230VAC The supply voltage selection is fixed according to the order designation. The power consumption is about 22 W maximum. Rated currents MFR 7SJ551 has three (PI, T and e) or four (R, S, T and e) current input modules with a rated current ,I of 1 A or 5 A. On the backside the relay is fitted with connection terminals for 1 A and connection terminals for 5 A. The current inputs must be connected to the secondary windings of a current transformer with a minimum accuracy of 10P10. The current transformer ratio can be set as a parameter value. For sensitive ,I measuring a different current circuit is available only suited for a rated current I,= 1 A. The selection for a normal or a sensitive earth current input is fixed according to the order designation. * Control DC voltage of binary inputs The minimal version of MFR 7SJ551 is fitted with two binary control inputs. MFR 7SJ551 with extended I10 has 5 binary control inputs. The control voltage range is 24 V - 250 V DC or 110 V - 230 V AC. The inputs can be configured either normally open or normally closed. Panel surface mounting using a 7SJ55 surface mounting bracket - Assemble the surface mounting bracket to the panel. For the dimensions refer to figure 2.4. 5.2.3 Checking the (optional) interface unit transmission link ... - Insert the unit into the surface mounting bracket cut-out and secure it with the fixing screws. - Mount the interface unit to the relay unit according to figure 2.1 5.2.2 Checking the rated data - Connect the earthing screw of the interiace unit to the protective earth of the panel or the cubicle. The rated date of MFR 7SJ551 must be checked against the plant data. This applies in particular to the auxiliary supply voltage, the rated current of the current transformers, the input range of the binary control inputs and the switching capacity of the output relay contacts. - Make connections via the male connector for the RTD temperature sensors (optional). Observe labelling of the female connector to ensure correct location. - Make connection with a 9-pole make D connector for the RS-485 interface for the data communication with a personal computer. - Make connection with the fibre optic interface: unscrew the protective caps at both FSMA connectors a. j MFR 7SJ551 6. 0 plug on the optical fibre cable terminal carefully; observe the designation of transmitter and receiver end; the transmitter terminal of MFR 7SJ551 (light grey) must be connected to the receiver terminal and the receiver terminal of MFR 7SJ551 (dark grey) must be connected to the transmitter terminal tighten the cap nuts without force and without use of tools observe the permissible bending radius of the fibre optic cable. Installation instructions measures and pay due attention to them. Non-observance can result in severe personal injury. - Switch off the circuit breakers for the auxiliary supply voltage. - Check the continuity of all the current transformer circuits and the (optional) voltage transformer circuit against the plant and connection diagrams: - Check if the fibre optic interface is set to the , 0 desired signal position: e the factory setting for the fibre optic interface is 'light off' 0 if the normal signal position should be changed in 'light on' open the serial interface housing and change the position of the plug jumpers X3 and X4 each from 1 - 2 to 2 - 3 according to figure 5.1. The jumpers are situated on the main board of the serial interface near the connection terminals of the optical fibre cable; close the housing. 0 Are the current and voltage transformers earthed correctly? Are the polarities of the current and voltage transformer connections consistent? Is the phase relationship of the current transformers correct? Is the polarity of the voltage transformer correct? - If test switches have been fitted in the secondary circuits, check their function. Check if the current transformer secondary circuits are automatically short-circuited in the 'test' position. - Fit a corresponding ampere meter in the auxiliary power circuit, range approx. 1 A. - Close the auxiliary voltage supply circuit r breaker, check the polarity (for the DC version) and the magnitude of the voltage at the terminals of the unit. ure 5.1 Jumper setting optical interface - The measured current consumption should correspond to a power consumption of 14 -18 W. Transient movement of the ampere meter pointer only indicates the charging current of the storage capacitors. 5.2.4 Connections General and connection diagrams are shown in Appendix A and B. The marshalling possibilities of the binary inputs and outputs are described in section 6.1 1. 5.2.5 Coming from the manufacturer the display will show: Checking the connections /!\Warning i - Some of the following test steps are carried out in presence of hazardous voltages. They shall be performed by qualified personnel only which is thoroughly familiar with all safety regulations and precautionary and the red 'monitor' LED will light up a few seconds after applying the auxiliary voltage. - Open the circuit breaker for the auxiliary power SUPP~Y. - Remove the current ampere meter and reconnect the auxiliary voltage supply leads. ~ MFR 7SJ551 - Thoroughly check the tripping command output circuits to the circuit breaker. - Thoroughly check the control wiring to and from other devices including the signal circuits. Installation instructions - For setting mode and for operative ('on line') @,' mode the auxiliary supply voltage circuit breaks. should be closed. I MFR 7SJ551 Operating instructions 9 Operating instructions 6.1 Safety precautions // - Warning All safety precautions which apply for work in electrial installations are to be observed during tests and commissioning. Dialogue with the relay 6.2 8 ing, operation and interrogation of MFR 7SJ551 ,an be carried out via the keyboard, display panel and LED'Slocated on the front plate. All the necessary operating parameters can be entered and all the information can be read out from the frontplate. Additionally, operation is possible via the serial interface by means of a personal computer. 6.2.1 Display panel The display panel is a 32 character display (two lines of 16 characters) and is used to visualize all communication to and from MFR 7SJ551. The language is English or German. In the display clearly understandable text is displayed, which makes comfortable parametrization and evaluation ~ossible. * display can also be used for ampere metering. 6.2.2 Keyboard Arrow keys With the arrow keys I&', '+' and '+'the user can move to the different menu parts, following the menu map. These keys can be depressed with closed front cover. Some parameters only have distinct values. For setting these parameters a right arrow (3) in the right most digit will appear. Selection of such a value key. occurs with the A continuous depressing of the 4 and keys will cause a fast presentation of the menu, in accordance with the existing setting. + @!set indicators key With the key for resetting indicators 'RI' memorized indicators and output relays can be reset. This key can be depressed with closed front cover. + Decimal keys ' 0 9' Function: The decimal keys allow the user to alter the currently selected parameter value or setpoint value. Effect: A figure in accordance with the decimal key will be inserted at the right most digit of the second row of the display while already present digits (or a decimal point) are shifted one position to the left. Depressing these keys while MFR 7SJ551 is 'on line' has no effect. Decimal point key '.' Function: The decimal point key allows the use of a decimal point in the currently selected parameter value or setpoint value. Effect: A decimal point will be inserted at the right most digit at the second row of the display, while already present digits are shifted one position to the left. The decimal point key can only be used once in a parameter value or a set point value. The first digit may be a decimal point so 0.015 can be entered as .015. Depressing this key while MFR 7SJ551 is 'on line' has no effect. Backspace key 'BS' Function 1: The backspace key allows the user to delete the right most digit or decimal point of the currently selected parameter value or setpoint value. Effect 1: Deletes the right most digit or decimal point of the currently selected parameter value or setpoint value of the second row of the display, while already present digits and decimal point are shifted one position to the right. Function 2: Effect 2: With the backspace key the user confirms the setting if MFR 7SJ551 asks for confirmation with the text "TYPE BACKSPACE". MFR 7SJ551 accepts the execution of special actions such as switching from 'on line' to 'off line' and vice versa. Depressing any other key will cancel the confirmation action. Representation of numerical values 1 O~eratinainstructions MFR 7SJ551 If any a l a n condition is detected by MFR 7SJ551 the ALARM indicator will light up. Numerical values can have the following appearance: range > number of decimals 100 100 example 16.8 742 0 If a time needs more than 4 digits before the decimal point the unit s (seconds) can be changed to m (minute) or h (hours) with the key. + If negative values are possible the sign of the value can be changed with the key. + 6.2.3 LED indicators e Trip (red) If any trip condition is detected by MFR 7SJ551 the TRIP indicator will light up. Monitor (red) Whenever MFR 7SJ551 is not performing its protection functions, the MONITOR indicator will light up. It indicates that MFR 7SJ551 is in 'off line' mode, which allows parameters to be changed, or that MFR 7SJ551 has detected an internal fauit and is out of operation for that reason. LED 1 to LED 4 (yellow, optional) These 4 LED indicators can be used to indicate specific alarm or trip conditions, among other things. It is advisable to indicate the chosen meaning of each LED indicator on its left side using the special sticke delivered together with the relay. 8 I On line (green) Whenever MFR 7SJ551 is performing its protection functions, the ON LINE indicator will light up. If a non-fatal internal fault is detected this indicator will blink. 6.2.4 Operation with a personal computer Pre-alarm (yellow) If the remaining thermal capacity has decreased under the adjustable alarm value, the PRE-ALARM indicator will light up, indicating that the protected device will get into thermal overload in the near future if no special measures are taken or no load decrease occurs. A personal computer (industrial standard) allows all the appropriate setting, initiation of test routines and read-out of data, with the comfort of screenbased visualisation and a menu-guided procedure. The PC Program 'Communication Utility MFR 7SJ551' is available for setting and processing of all digital protection data. Alarm (yellow) All data can be read in from, or copied onto diskette or documented on a connected printer. 1 / '., MFR7SJ551 (L.5 Operating instructions Front view of the relay Two line display (LCD) with 16 characters , Indication operative mode (green) 8 / Overload indication (yellow) / Alarm indication (yellow) Trip indication (red) Reset microcontroller hole ' indication OFF LINE mode / indication unit faulty (red) LED 1 to 4 (yellow) can be marshalled Arrow keys , I I A Reset indicators key 1 1 9 1 0 1 * 1 4 V Figure 6.1 Front view with operating keyboard and display panel Numerical keyboard MFR 7SJ551 Operating instructions Parameterizing procedure 6.3.1 Menu structure The operating interface is built up by a hierarchically structured menu tree, which can be passed through by means of the scrolling keys '&', '/t" and '+'.Thus, each operation object can be reached. In figure 6.2 the menu structure is shown. From the initial display, the key \L is used to switch to the first operation item SETTINGS, which contains all setting and configuration blocks of the device (see figure 6.3). Key is pressed to change to the next operation level. The display shows the first item DEVICE DATA, which is described in section 6.6. Further parameter blocks can be called up with the scrolling keys J/ or Figure 6.2 + +. Menu structure + Pressing the key leads to the third operation level where the individual functions and values are set; refer to figure 6.3. They are explained in detail in thf following sections. OPERATING OFF L I N E n NON-ROTATING CHANNELS J. Figure 6.3 Setting example In the following sections each menu item is explained. There are three forms of display: - Menu items without request for operator input These menu items guide you through the menu. No input is expected. By using keys \L or /f\ the next or previous menu item can be selected. By using the key 3 the next operation level can be reached. - Menu items which require numerical input These menu items display parameters that have a numerical value. When the relay is delivered a value has been preset. In the following sections, this value is shown. If this value is to be retained, no other input is necessary. If the value needs to be altered, you can use the numerical keyboard, as described in section 6.2.2. O~eratinainstructions MFR 7SJ551 &en" items which require a choice These menu items display parameters which only have a limited number of possible values or applicable text inputs. When the relay is delivered, a value or text has been preset. In the following sections, this setting is shown. If this settina is to be retained. no other i n ~ uist necessary. If the setting needs to b; altered, you can use the key +. After altering a setting, scrolling down with the key 4 causes the setting to be saved. The altered parameters are permanently secured in EEPROMs and protected against power outage. For each of the menu items, the possible parameters and text are given in the following sections. 6.3.2 initial display When the relay is switched on, shortly some startup messages appear. After that, the initial display appears. The SETTINGS block is reached by pressing the key 4. 6.4 Main menu (OFF LINE) OPERATING OFF L I N E This menu item is used for changing the OFF LlNE programming mode into the ON LlNE protective mode and vice versa. Refer to section 6.13 for a detailed description. If there are any unallowed settings the relay will ask for a change of the concerning settings. OFF L I N E 4 .1- OFF LINE ALARMITRI P OFF L I N E pE!Tq+ OFF L I N E UFACT. ;OFF L I N E In the SETTINGS menu all relay parameters can be set. Refer to section 6.8 for a detailed description. In the COUNTERS menu statistical data about the circuit breaker can be seen. Refer to section 6.1 4.3 for a detailed description. In the ALARMfrRiP DATA event recordings of the last three fault detections and the last three trips can be seen. Refer to section 6.14.4 for a detailed description. In the DEMAND AMMETER menu the demand ampere meter can be read out. Refer to sections 4.22.4 and 6.14.5 for a detailed description. MFR 7SJ551 Operating instructions In the MANUFACTURER DATA various information is provided, for example about the ordering code and the serial number of the relay. 6.5 s Furthermore, in this menu block a reset to the factory settings can be initiated. Refer to section 6.14.7 for a detailed description. SETTINGS menu The SETTINGS menu part is used for setting the parameters of MFR 7SJ551. SElTlNGS contains 7 sublevels. This description is only fully applicable to the maximum version of the relay. OFF L I N E + pr=J+ + D E V I C E DATA In the DEVICE DATA information about the protected component is programmed, to match the protection functions to the component data. Refer to section 6.6 for a detailed description. $ I In the CHANNELS menu the operator determines which current and voltage inputs are used and matches them to primary values. Refer to section 6.7 for a detailed description. 1- PROTECTIONS + In the PROTECTIONS menu all protection functions are set. Refer to section 6.8 for a detailed description. In the TRANSIENT DATA the operator determines how the fault recording is started. Refer to section 6.9 for a detailed description. In the REAL TIME CLOCK menu date and time can be altered. Furthermore, time synchronisation can be activated here. Refer to section 6.1 0 for a detailed descgption. In the MARSHALLING menu all inputs, outputs ar freely programmable LED indicators can be designated to all protective input and output signals. Refer to section 6.1 1 for a detailed description. 1 In the SERIAL COMMUNlCATlON menu the serial communication facility can be matched to the connected personal computer or station management system. Refer to section 6.12 for a detailed description. 6.6 Settings foe DEVICE DATA In the DEVICE DATA information about the protected component is programmed, to match the protection functions to the component data. a. MFR 7SJ551 Operating instructions Uiil":;i-i D E V i C E DATA + 3 L FREOUENCY L t v = fn r n 1- [Hz1 ~ - f l c~ 1 n 1 '// Nominal frequency of the protected device. 50 Hzor 60 Hz Full load current of the protected device. Setting range: 0.05 to 28 . I, The rated current provided by the manufacturer of the protected component should be filled in here. The full load current value is used by MFR 7SJ551 for the thermal overload protection and the start inhibit function. The full load current is converted in accordance with the current transformers and expressed in the secondary current value of the current input transformers (1 A or 5 A). Example I A device with a nominal full load current of 88 A and a current transformer with a ratio of 100 : 1 needs an If!, value of 1/100 x 88 = 0.88 . I, (this current can be connected to the 1 A current input). Example 2 A device with a nominal full load current of 88 A and a current transformer with a ratio of 100 : 5 will cause a current of 5/100 x 88 = 4.4 A. This current should be connected to the 5 A current input and the setting value is again 4.415 = 0.88 . I,. D E V I C E TYPE: ROTATING Type of the protected device. NON-ROTATING or ROTATING Choose NON-ROTATING for transformers, blow-out coils, cables, overhead lines and capacitor banks. Choose ROTATING for motors. Depending on the device type two different menu parts will appear. MFR 7SJ551 6.6.1 Operating ins.tructions Non-rotating device For a non-rotating device only the overload factor and the type of the temperature sensors have to be set. N O N -R O T A T I N G JI Overload factor Setting range: 1 to 1.5 The overload factor determines the maximum allowable continuous current (k x Inc). In most cases the overload factor is mentioned in the data of the manufacturer. If k = 1.05 it means that a current of 1.05 x IRcwill not cause a thermal overload. TEMPERATURE Temperature sensor type 100 This menu part determines the kind of temperature sensor used for performing the ambient temperature biasing and the overtemperature protection. 6.6.2 Rotating device For motors several motor data have to be set. Together with the full load current these data are used to determine if the motor is standing still, starting or running; furthermore these settings are used by the rotor and stator thermal overload functions. rn DEVICE TYPE: No-load current Setting range: 0.05 to 1 . ,I The motor will be regarded stopped when all the phase currents are below the setpoint value Inoload. In most cases the no-load current value is provided by the motor manufacturer. The motor status 'STOPPED' is used by MFR 7SJ551 for several functions (for example for 'Curve switch' and 'Block'). MFR 7SJ551 Operating instructions Permissible start-up current Setting range: ,,I 0.05 to 2 8 . I, must be set higher than IRc. MFR 7SJ551 uses,,I for the calculation of z,,,,,. In most cases the permissible start-up current value is provided by the motor manufacturer. Often values of lSt, are given for 80% and 100% rated motor voltage. For setting the manufacturer value of I,,,, for 100% rated motor voltage is preferable, even if the actual motor start-up current is different. Permissible start-up time t - s t a r t Csl \I, Setting range: 1 to 200 s MFR 7SJ551 uses & ,t for the calculation of .r,,. In most cases the permissible start-up time is provided by the motor manufacturer. Often values of,,,t are given for 80°h and 100% rated motor voltage. For setting the manufacturer value of Gta,for 100% rated motor voltage is preferable, even if the actual motor start-up time is different. Overload factor stator Setting range: 1 to 1.5 The stator overload factor determines the maximum x IRc). allowable continuous stator current (kStat In most cases the stator overload factor is mentioned in the data of the manufacturer. If k, = 1.10 it means that a current of 1.I 0 x lfl, will not cause a stator thermal overload. For most motors a minimum setting level for k, 1.05. is Unbalance factor Setting range: 0 to 10 The unbalance factor represents the extra warming up of the rotor due to asymmetric currents. Practical values can be calculated out of: Permissible number of starts from warm condition. Setting range: 1 to 15 i MFR 7SJ551 Operating instructions In most cases the permissible number of starts from warm condition is provided by the motor manufacturer. Permissible number of starts from cold condition. Setting range: 1 to 15 In most cases the permissible number of starts from cold condition is provided by the motor manufacturer. TEMPERATURE Temperature sensor type. 100 This menu part determines the kind of temperature sensor used for performing the ambient temperatur biasing and the overtemperature protection. ': 6.7 Settings for CHANNELS In the CHANNELS menu measuring inputs can be selected. Here primary and secondary values are linked together. Three submenus, 'PHASE CIRCUITS', 'EARTH CIRCUIT' and 'VOLTAGE CIRCUIT' must be entered. Operating instructions MFR 7SJ551 o g i n n i n g of the submenu CHANNELS and of the submenu PHASE CIRCUITS Disabling measuring of input phase current lL3 Enabling measuring of input phase current lL3 Disabling measuring of input phase current lLl Enabling measuring of input phase current lL, Maximum three and minimum two phases must be enabled to make processing of measured input currents possible. Disabling measuring of input phase current Ii, Enabling measuring of input phase current Iw Rated current IAor5A I in : J 1' IA1 This is the rated secondary current transformer current. Current transformer ratio. CIRCUITS CT- Setting range: 1 to 9999 J Be aware that this is a ratio, not the primary current transformer current. Example For a 500 : 5 current transformer the rated current must be set to 5 A and the current transformer ratio must be set to 100. Full scale phase current Imax [In] The full scale phase current is of influence on the accuracy of the measured current values. As the sampling of the current amplitude is discrete, the available number of sampling steps is distributed over the programmed full scale. This means the accuracy is highest for a full scale of 7 A and a factor 4 lower for 28 A. In practice, this has no significant effect on the performance of the protection functions, but is noticeable only for fault recording momentary values. Set the full scale phase current higher than the expected maximum current. (For currents higher than the programmed full scale phase current MFR 7SJ551 uses the maximum value instead. As the relay works on the ground harmonic only, the work value will be lower than the real value.) Example If the programmed full scale phase current is 7 A (RMS), a phase current of 10 A (RMS) will be cut off when the sinus momentary value reaches 62 . 7 A. I MFR 7SJ551 Operating instructions Disabling measuring of input earth current I, Enabling measuring of input earth current I, Beginning of the submenu EARTH CIRCUIT Rated earth current E A R T H CIRCUIT IAor5A This is the rated secondary current transformer earth current. & For ordering types MFR 7SJ5513 and MFR 7SJ5514 (sensitive earth current) only 1 A is possible. Earth current transformer ratio CT-RATIO Setting range: 1 to 9999 \L EARTH C I R C U I T Full scale earth current 7Aor 14Aor28A (regular earth current) 0.35 A or O.7A or 1.4 A(sensitive earth current) Set the full scale earth current higher than the expected maximum earth current. Beginning of the submenu VOLTAGE CIRCUIT Disabling measuring of input voltage Ui, Enabling measuring of input voltage Ui, ENABLED Voltage circuit type U select: / / Uoor Ynselect: U-tl tIhsel e c t : U-f( J/ U,,or Uph Here residual voltage, line-to-linevoltage or phase to earth voltage can be selected. These are merely text indications, no functional difference is made by the relay. MFR 7SJ551 Operating instructions Rated voltage 100 p q 6 VT- R A T I O 100 V o r 110 V Voltage transformer ratio Setting range: 1 to 9999 Operating instructions MFR 7SJ551 6.8 Settings for PROTECTIONS In the PROTECTIONS menu all protection functions are set. PROTECTIONS contains 16 sublevels. This description is only fully applicable to the maximum version of the relay. m, PROTECTIONS + + THERM.OVERLOk + m LOW S E T O . C . + 3 p5mq H I G H S E T O.C.+ 3 PROTECTION EARTHFAULT 1- . I , L O C K E D ROTOR a + pm%==J+ ZERO S P E E D )PROTECTION1 + + UNDERVOLTAGE OVERVOLTAGE & p i h q+ CURVE S W I T C H a PROTECTION MFR 7SJ551 Operating instructions 6.8.1 THERMAL OVERLOAD protection 6.8.1.I Thermal overload protection for rotating objects For motors MFR 7SJ551 uses different thermal models for the rotor and the stator. Most parameters for the rotor thermal overload protection are set already in DEVICE DATA. The parameters set in the submenu THERMAL OVERLOAD (ROTATING OBJECTS) are combined with the motor manufacturer data as set in the DEVICE DATA menu to form the rotor and stator thermal overload models. Most parameters for the stator thermal overload protection are programmed in the submenu THERMAL OVERLOAD described here. 1:;'"""' THERM.OVEi?LO& + OVERLOAD Beginning of the submenu THERMAL OVERLOAD I DISABLED )I AMBIENT TEMP. 11 1 DISABLED 1 ENABLED 1' Enabling the thermal overload protection Disabling the thermal overload protection Disabling the AMBIENT TEMPERATURE BIASING Enabling the AMBIENT TEMPERATURE BIASING. Refer to section 6.8.2 for a detailed description. Thermal time constants stator ~ 1 , s t a tCsl 1- Setting range: 1 s to 999 rain .L OVERLOAD MFR 733551 uses two time constants for the stator thermai overload protection. Each time constant determines an exponential curve. These two curves are added up, weighted by a weighing factor Pweism. Weighing factor p-wei g h t Setting range: 0 to 1 \L The parameters rlmstat, T ~and, p w~e i g are ~~ set ~ according to the stator thermal withstand curve supplied by the motor manufacturer. Use the operating and evaluation software program 'Communication Utility MFR 7SJ551' to calculate the three parameters out of three current-time points. Operating instructions MFR 7SJ551 1 Example 1 Figure 6.3 For the three current-time points of figure 6.3 k(, 1.05, preload = 0%) 'Communication Utility MFR 7SJ551' calculates: TI,S~~ = 861 s %,stat = 195 s Pweisht = 0.61 = With no thermal withstand curve (or three operating points) available it makes no sense to use all three t ~ t pwerght Just set P w e i g ~to 1; parameters ~ 1 . ~a 2~, ~and then onlyzl is effective. To set Tl,stat only one operating point is needed (besides the stator overload factor k,,,). Example Only one operation point is available: if the current step response I is 1.5 x Inc, the motor has to be tripped in ttdP= 20 minutes (cold condition). Then the formula for the tripping time (refer to section 4.2.3) changes to: t trip = T~,sta: . I.(,. 1 j - kstat .~:lc Filling in all known values leads to T~,,~, =26 minutes. Cooling-down factor stator Setting range: 1 to 10 Cooling-down factor rotor Setting range: 1 to 10 When the motor is stopped it begins to cool down. Cooling down from an attained MFR 7SJ551 Operating instructions temperature generally lasts longer than warming up to this temperature. How many times longer can be set with these factors. In most cases the cooling down factors are provided by the motor manufacturer. Warning level stator thermal overload protection Setting range: 0 '10 to 95 O h By setting this warning level a pre-alarm will be given to enable the network operator to disconnect load from the electric network. Set the warning level in accordance with the normal load current. For a continuous load current I smaller than, ,k x Ifi, the thermal reserve will eventually attain an equilibrium value: The warning level must be set lower than this equilibrium value, to be sure there will be a warning for overload only. For I = Iflcthe formula changes to: Example The normal load of a motor is full load current. k , = 1.05. The equilibrium value of the thermal reserve will be 9.3 %. The warning level is set to 5 %. START I INHIBIT ENABLED '1 Disabling the start inhibit function Enabling the start inhibit function Refer to section 6.8.3 for a detailed description. 0 MFR 7SJ551 6.8.1.2 Operating instructions Thermal overload protection for non-rotating objects In the submenu THERMAL OVERLOAD (NONROTATING OBJECTS) parameters are set for thermal overload protection of transformers, blowout coils, cables and capacitor banks. THERM.OVERLOA, + OVERLOAD I DISABLED ?I f AMBIENT TEMP. DISABLED ml TrueRMS: IL;;fiMS: \L 21 Disabling the AMBIENT TEMPERATURE BIASING Enabling the AMBIENT TEMPERATURE BIASING Refer to section 6.8.2 for a detailed description. Measuring circuit for thermal overload protection PHASEor EARTH This menu part determines whether the phase currents or the earth current are used for the thermal overload protection of the device. Choose 'PHASE' if the protected device is a transformer, cable or capacitor bank. Connect the current transformer currents to the phase inputs of the relay. Choose 'EARTH' if the protected device is a blowout coil. Connect the ring core transformer to the earth current input of the relay. Thermal time constants stator Setting range: 1 s to 999 rnin MFR 7SJ551 uses two time constants for the thermal overload protection of non-rotating objects. Each time constant determines an exponential curve. These two curves are added up, weighted by a weighing factor pWeig~. Weighing factor p-weight \L Setting range: Oto1 The parameters TI,TZ and P ~,,~ are set according to the thermal withstand curve supplied by the manufacturer of the network component. Use the operating and evaluation software program 'Communication Utility MFR 7SJ551' to calculate the three parameters out of three current-time I Operating instructions MFR 7SJ551 points. Refer to the preceding paragraph for an example of how to calculate .rl, 2 2 and &eight with this program. With no thermal withstand curve (or three operating points) available it makes no sense to use all three paranIeters TI, 7 2 and Pweig~. Just set Pweight to 1; then only T, is effective. To set z,only one operating point is needed (besides the stator overload factor .),k, Refer to the preceding paragraph for an example of how to calculate z, in this situation. pgq ENABLED Enabling the adjustment of the time constants Disabling the adjustment of the time constants Adjusting factor Setting range: 0.01 to 10 When the network component is switched off it begins to cool down. Cooling down from an attained temperature can last longer than warming up to this temperature, for example when the cooling pump of a cable is switched off. Also, the cooling pump can break down while the cable is warming up. In this case the warming-up goes faster. How many times shorter or longer warming-up or cooling down takes, can be set with the adjusting factor. By energizing the binary 7,dj input (via a control system or by hand) the time constants are multiplied each with the Cadi factor. Warning level thermal overload protection for nonrotating objects Setting range: Oto95% By setting this warning level a pre-alarm will be given to enable the network operator to disconnect load from the electric network. Set the warning level in accordance with the normal load current. For a continuous load current I smaller than k x lfl, the thermal reserve will eventually attain an equilibrium value: * 6 MFR 7SJ551 Operating instructions The warning level must be set lower than this equilibrium value, to be sure there will be a warning for overload only. For i = IRcthe formula changes to: Example The normal load of a network component is full load current. k = 1.05. The equilibrium value of the thermal reserve will be 9.3 %. The warning level is set to 5 %. ) 6.8.2 AMBIENT TEMPERATURE BIASING (optional) The AMBIENT TEMPERATURE BIASING menu is a submenu of the THERMAL OVERLOAD menu. With these parameters MFR 7SJ551 adjusts the values in the thermal reserve buffers according to 1 the actual ambient temperature. This menu part is only applicable in relays equipped with an interface module containing temperature sensor connectors. Beginning of the submenu AMBIENT TEMPERATURE BIASING DISABLED Enabling the ambient temperature biasing Disabling the ambient temperature biasing A M B I E N T TEMP. \L Maximum ambient temperature Setting range: 0 to 200 OC This menu part determines the maximum allowable temperature of the used isolation material of the device (and not the expected maximum environment temperature!). Set this value to 120 "C if isolation is in accordance with class B, and to 140 "C for class F. Nominal ambient temperature AMBIENT TEMP. **** Setting range: 0 to 200 "C This menu part determines the nominal environment temperature (and not the minimum allowed environment temperature!). In most cases this MFR 7SJ551 Operating instructions value is set to 40 O C (refer to manufacturer data). , ,T must always be higher than Tmin. Input sensor number I "I N P U T 1 6.8.3 SENSOR pl Choose the number of the input sensor that is measuring the ambient temperature. I ANPUT SENSOR 1) START IkdHlBlT The START INHIBIT menu is a submenu of the THERMAL OVERLOAD menu. With the parameters set in this menu, MFR 7SJ551 inhibits starting of the motor until the motor has regained sufficient thermal reserve. ml-1 THERM.OVERLOA, + OVERLOAD Beginning of the submenu START INHIBIT START I N H I B I T Enabling the start inhibit function Disabling the start inhibit function START I N H I B I T Start inhibit release extension time \L Setting range: 0 s to 166 min This is an additional release time of the start inhibit output relay after the thermal reserve has reached the threshold value. With this parameter the total time the start inhibit output prevents the motor from . . starting is extended. 0 " I MFR 7SJ551 Operating instructions Example A motor has been tripped upon rotor thermal overload. The stator thermal reserve is above the stator inhibit level. The rotor warming-up time constant is 200 s. The rotor inhibit level is 30% (refer to sections 3.* and 4.* for calculations). The rotor cooling down factor is 2. According to the manufacturer data a start has to be inhibited for 10 minutes after trip. How long must the start inhibit release extension time be set? As the load current is x lRc, the formula zero and the preload current is k, for the rotor thermal reserve changes to: After -400 x In 0.7 = 143 s the rotor thermal reserve will reach 30%. So tinh must be set to 10 x 60 - 143 START I N H I B I T @-stator[%] Stator start inhibit level Setting range: 0 to 100% The stator start inhibit level only works upon the stator thermal reserve buffer. Be aware that the start inhibit function works for both rotor thermal reserve and stator thermal reserve buffers. Both thermal reserves must exceed the release thresholds before the start inhibit output is released. (The rotor start inhibit level cannot be set separately from the stator start inhibit level; it is calculated by the relay as described in section 4.4.) Set the stator inhibit level in accordance with motor manufacturer recommendations. The time needed for reaching the inhibit level after trip, is related to the stator start inhibit level according to the following formula. Example 1 For a motor with ~,,~t, = 100 S, 22,stat = 200 S, Pwelght = 0.5 and ~,c, = 2 the manufacturer recommends to inhibit a start for 5 minutes after stator overload trip. How must the stator start inhibit level be set? Filling in the release time gives a stator start inhibit level of 54.1 %. (The 6 MFR 7SJ551 Operating instructions start inhibit release extension time can be set to 0 s.) Example 2 For a motor with T,,,, = 100 S, %,,tat = 200 S, Pweigm= 0.5 and c,~,~, = 2 the stator start inhibit level is set to 50% and the start inhibit release extension time is set to 0 s. How long does it take to release a start? Filling in different release times: release time 275 s 276 s 277 s 278 s 279 s 280 s stator start inhibit level 49.6% 49.8% 50.0% '0 50.11 50.3% 50.5% gives a release time of 277 s. Enabling the emergency restart function Disabling the emergency restart function When the start inhibit function is enabled, here the emergency restart function can be activated. 6.8.4 EMERGENCY RESTART The EMERGENCY RESTART menu is a submenu of the START INHIBIT menu. With setting the EMERGENCY RESTART parameter the start inhibit can be overruled. MFR 7SJ551 Operating instructions START I N H I B I T l ENABLED 41 Beginning of the submenu EMERGENCY RESTART Enabling the emergency restart function Disabling the emergency restart function ENABLED 8 6.8.5 No further parameters have to be set. To overrule the start inhibit the binary emergency restart input has to be energized. Then the thermal reserve buffers will be reset to 100%. OVERTEMPERATURE protection (optional) i I For OVERTEMPERATURE PROTECTION the relay has to be equipped with an interface module containing temperature sensor connectors. Two types RTD interface modules are available: with two or with eight temperature sensor con-nec-tors. Temperature sensor inputs that are not connected to a temperature sensor should be closed with a resistor (50 - 100 Q) to fix the display value. Beginning of the submenu OVERTEMPERATURE. Enabling the overtemperature protection. Disabling the overtemperature protection. Overtemperature alarm level Setting range: TRIP 1 ["C] 0 to 200 OC Overtemperaturetrip level Setting range: 0 to 200 "C For each temperature sensor an alarm pick-up and a trip pick-up can be set individually (only integers). Unused temperature sensor pick-ups should be set to 999 "C to prevent unwanted pick-up. The trip value must be set higher than the alarm value. OVERTEMPERATU TRIP 8 C°CI I - 6 MFR 7SJ551 6.8.6 Operating instructions UNDERCURRENT protection UNDERCURRENT PROTECTION can be applied to all network components. For motors the function 1 ""'i'-:""-i UNDERCURRENT + needs one parameter more (tbypass) than for nonrotating objects. Beginning of the submenu UNDERCURRENT + Enabling the undercurrent protection Disabling the undercurrent protection UNDERCURRENT t-bypassisl \L Bypass time Setting range: 0 to 100s The undercurrent bypass time is applicable for motors only. The bypass time is started at the moment the motor status changes from 'start' to 'running'. During the bypass time the undercurrent protection function is inactive. Undercurrent pick-up Setting range: 0.05 to 28 . I, For motors the pick-up value must be set higher than the no-load current. Pick-up occurs in case of a loss of or decrease in motor load. Examples of such situations are: loss of suction of pumps, loss of airflow for fans or a broken belt for conveyors. For capacitor banks the pick-up value must be set minimum to (0.05 . I,), to be sure the relay does not pick up if there is remaining capacitive current. Undercurrent delay time Setting range: 0 s to 166 min 3 Operaiing instructions MFR 7SJ55i I 6.8.7 LOW SET B\/ERCURRENT protection For low set overcurrent protection, MFR 7SJ551 distinguishes between - phase fault overcurrent - earth fault overcurrent. The possible characteristics for low set phase and earth fault overcurrent protection are: - definite time overcurrent - inverse time overcurrent - custom curve overcurrent. Two different characteristics for phase overcurrent protection and two different characteristics for earth fault overcurrent protection can be programmed. During operation the CURVE SWITCH function determines which of the two is effective. Refer to section 6.8.1 6 for a detailed description. Beginning of the submenu LOW SET OVERCURRENT Enabling the low set phase fault overcurrent protection Disabling the low set phase fault overcurrent protection I,,,,I: L O W SET O . C . pFq DEFINITE 1 ;tlIR:NORMAL 21 VERY 11 ERR '1 : R I : Choose the type of phase fault overcurrent characteristic for CURVE 1. DEFINITE Refer to section 6.8.7.1 NORMAL INVERSE VERY INVERSE EXTREMELY INVERSE Refer to section 6.8.7.3 CUSTOM CURVE Refer to section 6.8.7.5 C UH SA TR O: M m L O W SET O . C . LOW SET O . C . ENABLED The same procedure is followed for setting phase fault CURVE 2. Enabling the low set earth fault overcurrent protection Disabling the low set earth fault overcurrent protection 1 " I MFR 7SJ551 Operating instructions h L O WS E T O.C. 11 Choose the type of earth fault overcurrent characteristic for CURVE 1. DEFINITE R ICHAR: I VERY 11 EXTR 21 NORMAL INVERSE VERY INVERSE EXTREMELY INVERSE LONG TIME EARTH FAULT RESIDUAL DEPENDANT TIME NV CUSTOM CURVE l CHAR: RD .L I~LOW SET B.C. 21 11 m,m, 6.8.7.1 Refer to section 6.8.7.2 Refer to section 6.8.7.4 Refer to section 6.8.7.5 The same procedure is followed for setting earth fault CURVE 2. Definite time phase fault overcurrent protection LOW S E T O . C . + + PHASE: Beginning of the submenu LOW SET OVERCURRENT PHASE Enabling the low set phase fault overcurrent protection Disabling the low set phase fault overcurrent protection LOW SET O . C . J, Beginning of the settings for phase fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Beginning of the phase fault DEFINITE TIME overcu rrent settings DEFINITE J, MFR 7SJ551 Operating instructions Pick-up value of the phase fault overcurrent stage I> Setting range: 0.05 to 28 . I, The maximum load current determines the setting of the overcurrent stage I>. Pick-up on overload must be excluded since the low set overcurrent is a shortcircuit protection with adequate short tripping time. Therefore the overcurrent stage is set to 120% for feeder lines, and 150% for transformers or motors referred to maximum overload current. Trip time delay for the overcurrent stage I> Setting range: 0 s to 166 min The time delay tl> depends on the grading plan for the network. For modern circuit breakers minimum 0.3 s time difference between two grading levels can be used. Use 0.5 s for older circuit breakers. The setting times are pure delay times which do not include the relay operating time. LOW SET O . C . For curve 2 an alternative characteristic or an alternative pick-up value or delay time can be set. CURVE 2 is available only if the CURVE SWITCH function is activated. For motor protection it is beneficial to set the CURVE SWITCH function in the mode STATUS. In this case, for high speed clearing of motor phase faults the following conditions must be fulfilled for the setting of the pick-up value I> of CURVE 2: - the minimum pick-up value must be greater than 1.6 times motor locked rotor current (maximum inrush due to asymmetry) - the minimum pick-up value must be smaller than the minimum short-circuit current. Differential protection should be provided if the above criteria are not met! In practice the maximum pick-up current must be smaller than circa 113 of the maximum occurring 3-phase shortcircuit current. Program the STATUS mode to STOPISTART; then CURVE 2 is activated automatically when the relay recognizes a start or stand-still. For transformer protection CURVE 2 can be used to lift up the pick-up value temporarily MFR 7SJ551 Operating inst ructions during transformer inrush. To activate CURVE 2 a binary input is energized. Refer to section 6.8.16 for a more detailed description of the CURVE SWITCH function. 6.8.7.2 Definite time earth fault overcurrent protection Beginning of the submenu LOW SET OVERCURRENTEARTH LOW SET O . C . ENABLED LOW S E T O . C . DEFINITE Enabling the low set earth fault overcurrent protection Disabling the low set earth fault overcurrent protection Beginning of the settings for earth fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Beginning of the earth fault DEFINITE TIME overcurrent settings & Pick-up value of the earth fault overcurrent stage I,> Setting range: 0.05 to 28 . I, for regular earth current detection 0.003 to 1.4 - ,I for sensitive earth current detection The minimum earth fault current determines the setting of the overcurrent stage 12. With DIRECTIONAL EARTHFAULT PROTECTION enabled, the denomination of the pick-up value changes to 19. Trip time delay for the overcurrent stage I,> Setting range: 0 s to 166 min The time delay tl,> depends on the grading plan for the network which can be separate for earth faults. For modern circuit breakers minimum 0.3 s time difference between two grading levels can be used. Use 0.5 s for older circuit MFR 7SJ551 Operating instructions breakers. The setting times are pure delay times which do not include the relay operating time. With DIRECTIONAL EARTHFAULT PROTECTION enabled, the denomination of the time delay changes to t l p . LOW @ 11 SET O . C . For curve 2 an alternative characteristic or an alternative pick-up value or delay time can be set. CURVE 2 is available only if the CURVE SWITCH function is activated. 6.8.7.3 Inverse time phase iauit overcurrent protection Beginning of the submenu LOW SET OVERCURRENT PHASE I +I PHASE: Enabling the low set phase fault overcurrent protection Disabling the low set phase fault overcurrent protection Beginning of the settings for phase fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Type of INVERSE characteristic for CURVE 1 NORMAL INVERSE ICHAR: VERY 21 R EXTR 21 I NV : 1 CHAR: . . . -+I VERY INVERSE EXTREMELY INVERSE time lag according to IEC 255-3, type A time lag according to IEC 255-3, type B time lag according to IEC 255-3, type C. A choice can be made between three tripping characteristics defined in IEC 255-3. Pick-up value of the phase fault overcurrent stage ,1 Setting range: 0.05 to 28 . I, Time multiplier for the overcurrent stage ,I Setting range: 0 to 10 i " MFR 7SJ551 For curve 2 an alternative characteristic or an alternative pick-up value or delay time can be set. CURVE 2 is available only if the CURVE SWITCH function is activated. LOW S E T O . C . 6.8.7.4 ' Operating instructions inverse time earth fault overcurrent protection Beginning of the submenu LOW SET OVERCURRENT EARTH Enabling the low set earth fault overcurrent protection Disabling the low set earth fault overcurrent protection LOW S E T O . C . ENABLED I EARTH: DISABLED [ L O W SET O.C. 11 '"4 C H A R : NORMAL 1 1 R : VERY ?/ R : EXTR 21 CHAR: I CHAR: I CHAR: Beginning of the settings for earth fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Type of INVERSE characteristic for CURVE 1 NORMAL INVERSE time lag according to IEC 255-3, type A VERY INVERSE time lag according to IEC 255-3, type B EXTREMELY INVERSE time lag according to IEC 255-3, type C. LONG TIME EARTH FAULT RESIDUAL DEPENDANT TIME RD ... ... 2 2 A choice can be made between three tripping characteristics defined in IEC 255-3 and two additional characteristics. Pick-up value of the earth fault overcurrent stage Ie, Setting range: 0.05 to 28 - I, for regular earth current detection 0.003 to 1.4 . I, for sensitive earth current detection MFR 7SJ551 Operating instructions With DIRECTIONAL EARTHFAULT PROTECTION enabled, the denomination of the pick-up value changes to .,I For the RESIDUAL DEPENDANT TIME curve the denomination of the pick-up value changes to 12. Time multiplier for the overcurrent stage ,I Setting range: 0 to 10 With DIRECTIONAL EARTHFAULT PROTECTION enabled, the denomination of the time multiplier changes to 6,. For curve 2 an alternative characteristic or an alternative pick-up value or delay time can be set. CURVE 2 is available only if the CURVE SWITCH function is activated. LOW S E T O . C . 6.8.7.5 Custom curve overcurrent protection The description of the CUSTOM CURVE overcurrent protection is valid for both phase and earth fault overcurrent protection. For earth fault overcurrent protection 'earth' should be read where 'phase' is used. Beginning of the submenu LOW SET OVERCURRENT PHASE I ~E!::~LED \L '1 LOW SET O . C . mi \L CUSTOM pF-1 #/ OF P O I N T S Enabling the low set phase fault overcurrent protection Disabling the low set phase fault overcurrent protection Beginning of the settings for phase fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Beginning of the phase fault overcurrent settings CUSTOM CURVE , I Operating instructions MFR 7SJ551 Number of current-time points Setting range: 2 to 15 Up to 15 pairs of values of current and time can be programmed. The relay calculates intermediate values by linear interpolation. It is permitted to program less current-time points. Pick-up value of the custom curve overcurrent stage 1 0.05 to 28 . I, for regular earth current detection 0.003 to 1.4 . I, for sensitive earth current detection Trip time delay for the custom curve overcurrent stage 1 Setting range: 0 s to 166 min The relay has the following preset values: 2.50 MFR 7SJ551 6.8.8 Operating instructions HlGH SET OVERCURRENT protection For high set overcurrent protection MFR 7SJ551 distinguishes between: - phase fault overcurrent - earth fault overcurrent H l G H SET O.C.+ 3 PHASE: & x HIGH SET O.C. Two different characteristics for phase overcurrent protection and two different characteristics for earth fault overcurrent protection can be programmed. During operation the CURVE SWITCH function determines which of the two is effective. Refer to section 6.8.16 for a detailed description. Beginning of the submenu HlGH SET OVERCURRENTPHASE Enabling the high set phase fault overcurrent protection Disabling the high set phase fault overcurrent protection Beginning of the settings for phase fault CURVE 1. If the CURVE SWITCH function is disabled, this menu line will not appear. Pick-up value of the phase fault overcurrent stage 1>> Setting range: 0.05 to 28 . 1, This stage is often used for current grading before high impedances, e.g. transformers or motors. This stage is always a definite time stage, independent of which characteristic is set for the low set overcurrent stage. It protects against short-circuits taking place in this concentrated impedance, e.g. for 1 If ,I transformers up to 1.5 times -. UK transi In c.t. Trip time delay for the overcurrent stage I>> Setting range: 0 s to 166 min HIGH SET O.C. \L For curve 2 an alternative characteristic or an alternative pick-up value or delay time can be set. CURVE 2 is available only if the CURVE SWITCH function is activated. " MFR 7SJ551 ' Operating instructions Beginning of the submenu HIGH SET OVERCURRENT EARTH Enabling the high set earth fault overcurrent protection Disabling the high set earth fault overcurrent protection All further settings for the high set earth fault overcurrent protection are similar to the settings of the high set phase fault overcurrent protection. 6.8.9 A further application of the high set overcurrent protection is the reverse interlocking principle. The I>> stage is used for rapid tripping in case of a bus bar fault, with only a short safety time. The low set overcurrent stage is the back-up for faults on an outgoing feeder. The relays protecting the outgoing feeders block the I>> stage via the binary input when the fault is in their protection area (refer to figure 4.20). Set the pick-up value I>> at the same value as I> or I,. UNBALANCE protection UNBALANCE PROTECTION can be applied to all network components. For motors the function than for nonneeds one parameter more (bypass) rotating objects. Beginning of the submenu UNBALANCE Enabling the unbalance protection Disabling the unbalance protection UNBALANCE Bypass time t-bypass[sl & Setting range: 0 to 100 s The unbalance bypass time is applicable for motors only. The bypass time is started at the moment the motor status changes from 'stopped' to 'start'. During the bypass time the unbalance protection function is inactive. A practical value is 1.0 s. I Operating instructions MFR 7SJ551 UNBALANCE .zoo \L Unbalance pick-up 0.05 to 28 . I, Setting range: For motors a practical setting value can be calculated out of: mi UNBALANCE Unbalance time multiplier 0 to 25 Setting range: For motors a practical setting value can be calculated out of: with tc, the thermal copper warming-up time constant as provided by the motor manufacturer. 6.8.1.8 C DlRECT10NAE EARTHFAULT protection (optional) The DIRECTIONAL EARTHFAULT protection can be used in isolated or arc compensated networks to detect an earth fault and to determine the earth fault direction. Because of its high sensitivity it is not suited for detection of higher earth fault currents (from 1 A and above at the relay terminals for sensitive earth current detection). For those + 3 EARTHFAULT EARTHFAULT ENABLED pjq applications use the relay ordering option with terminals for regular earth current detection. The directional earth fault protection function uses the two-stage current time characteristic which is set in the submenus LOW SET OVERCURRENT EARTH and HIGH SET OVERCURRENT-EARTH. Beginning of the submenu DIRECTIONAL EARTHFAULT Enabling the directional earth fault protection Disabling the directional earth fault protection Measuring principle CONTROL: COSlNE SINE active power measurement reactive power measurement MFR 7SJ551 Operating instructions In isolated systems earth fault measurement with SINE is used because the capacitive current is decisive for the earth fault direction. In compensated systems earth fault measurement with COSINE is used because the ohmic current is decisive for the earth fault direction. In earthed systems earth fault measurement with COSINE is used with a correction angle of -45" because the earth current is ohmic-inductive. In electrical machines in bus-bar connection with an isolated system, COSINE measurement can be selected with a correction angle of +4S0because the earth current is often composed of a capacitive component from the system and an active component from an earth fault load resistor. EARTH FAULT U - s t r t [Un] Displacement voltage Setting range: 0.05 to 1.2 . U, \L The residual voltage Us,, initiates earth fault detection and is one condition for release of directional determination. Since, for earth faults in isolated or compensated networks, the full displacement voltage appears, the setting value is not critical; it should lie between 30 V and 60 V. In earthed networks, the set value of the earth voltage Us,, can be more sensitive (smaller); but it should not be exceeded by operational asymmetry of the voltages of the power system. EARTH FAU LT t U-strt[sl Pick-up delay Setting range: 0 s to 166 min Earth fault is detected and annunciated only when the displacement voltage has been present for the t., duration U pLq FORWARD Directional trip condition for low set earth current stage FORWARD or BACKWARD * I MFR 7SJ551 Operating instructions mi FORWARD Directional trip condition for high set earth current stage FORWARD or BACKWARD Rotation angle EARTHFAULT [a]+**** Setting range: -45" to +45" Set the rotation angle to -45' in earthed systems using COSINE earth fault measurement which is used for angle correction for ohmic-inductive earth currents. In electrical machines in bus-bar connection with an isolated system, COSINE measurement can be selected with a correction angle of +45" because the earth current is often composed of a capacitive component from the system and an active component from an earth fault load resistor. EARTHFAULT Current transformer angie correction for I, 2 100 mA ** ** \L EARTHFAU L T Setting range: 0"to 5" Current transformer angle correction for 100 mA < ,I 5 200 mA **** & EARTH FAU LT Setting range: On to 5" Current transformer angle correction for I, > 200 mA **r* Setting range: 0"to 5" The high reactive current component in compensated networks and the unavoidable air gap of the window-type current transformers often make compensation of the angle error of the current transformer necessary. With the programmed angle corrections the relay adapts the measurement results to the characteristic of the transformer. In isolated or earthed networks this angle error compensation is not necessary. ~ I MFR 7SJ551 6.8.1 1 Operating instructions LOCKED ROTOR protection /1 - Beginning of the submenu LOCKED ROTOR protection LOCKED ROTOR + 3 Enabling the locked rotor protection Disabling the locked rotor protection LOCKED R O T O R Permissible locked rotor time Setting range: 0 to 200 s In most cases the permissible locked rotor time is mentioned in the data of the manufacturer. As the locked rotor condition is very critical, take a safety margin of 1 s. If the permissible start-up time is longer than the permissible locked rotor time the locked rotor protection function is inadequate: then the zero speed function has to be used. 6.8.1 2 ZERO SPEED protection If the permissible start-up time is longer than the permissible locked rotor time the locked rotor protection function is inadequate: then the zero speed function has to be used. Beginning of the submenu ZERO SPEED protection Enabling the zero speed protection Disabling the zero speed protection , Zero speed detection time Z E R O SPEED Setting range: 0 s to 166 min If, during zero speed alarm, the binary zero speed input (connected to a binary tachometer) stays energized during,,,t , the relay will issue a trip command. MFR 7SJ551 @ 6.8.13 Operating instructions UNDERVOLTAGE protection (optional) Beginning of the submenu UNDERVOLTAGE protection UNDERVOLTAGE + 3 Enabling the undervoltage protection Disabling the undervoltage protection m UNDERVOLTAGE Undervoltage pick-up Setting range: 0.05 to 1.2 . U, Depending on the programmed voltage circuit type Uo<, UI,< or Uph<is displayed. As a default Uo< is displayed. Undervoltage delay time UNDERVOLTAGE 0 s to 166 min Setting range: 6.8.1 4 OVERVOLTAGE protection (optional) Beginning of the submenu OVERVOLTAGE protection 1 DISABLED - Enabling the overvoltage protection Disabling the overvoltage protection \L p!pqEq I I1 ./3U \L Pick-up value of the low set stage U> Setting range: 0.05 to 1.2 . U, Depending on the programmed voltage circuit type Uo>, U,,> or Uph>is displayed. As a default Uo> is displayed. OVERVOLTAGE 4 Trip time delay of the low set stage U> Setting range: 0 s to 166 min MFR 7SJ551 Operating instructions OVERVOLTAGE 1. o o OVERVOLTAGE L . Pick-up value of the high set stage U>> Setting range: 0.05 to 1.2 . U, Trip time delay of the high set stage U>> Setting range: O s t o 166rnin 6.8.65 BREAKER FAILURE PROTECTION p m q l + ~ ] ENABLED EXTERN: D I S A B L + Beginning of the submenu BREAKER FAILURE PROTECTION Enabling the breaker failure protection Disabling the breaker failure protection Disabling the external control Enabling the external control Start of the breaker failure protection can be initiated by an external protection relay. The trip signal of the external protection device is coupled into MFR 7SJ551 via a binary input. Pick-up value of current stage Setting range: 0 to 28 . I, Time stage Setting range: 0 s to 166 min When the trip command is generated timer tbfis started. The timer continues to run for as long as the trip command is maintained. If the circuit breaker does not respond to the trip command the timer runs to its set limit. If the then measured current is higher than Ibfthe breaker failure protection energizes a second relay output to trip the upstream circuit breaker to clear the fault. MFR 7SJ551 Operating instructions external protection device is coupled into MFR 7SJ551 via a binary input. The timer tbfis started. If the measured current is higher than lbf after tbf has elapsed, the breaker failure protection energizes the breaker failure protection relay output to trip the circuit breaker to clear the fault. Deenergizing of the binary breaker failure protection input only has effect as soon as the measured current becomes smaller than fbf. The submenu CURVE SWITCH only appears when low set overcurrent protection or high set overcurrent protection is enabled. ';""I':"Im i CURVE S W I T C H + + Beginning of the submenu CURVE SWITCH Enabling the curve switch function Disabling the curve switch function ~ Curve switch mode. CONTlNUOUS PULSE STATUS MFR 7SJ551 switches from curve 1 to curve 2 during the activation of the curve switch binary input MFR 7SJ551 switches from curve 1 to curve 2 during the curve switch time tcs, after the activation of the curve switch binary input only for motors; depending on motor status MFR 7SJ551 automatically switches from curve 1 to curve 2 If the curve switch mode CONTINUOUS is set, no further menu item appears. CURVE SWITCH 10.0 Curve switch activation time Setting range: 0 s to 166 min If the curve switch mode PULSE is set, this menu item appears. a J MFR 7SJ551 Operating instructions CURVE SWITCH RUNNING 6.8.17 Curve switch status If the curve switch mode STATUS is set, this menu item appears. RUNNING when the motor status is RUNNING, curve 2 is active, when the motor status is STOPPED or START curve 1 is active STOPPED/START when the motor status is STOPPED or START, curve 2 is active, when the motor status is RUNNING curve 1 is active BLOCK With the BLOCK function MFR 7SJ551 provides the possibility to block the overcurrent, undercurrent and undervoltage characteristics during motor or transformer inrush. The submenu BLOCK only appears when undercurrent protection, low set overcurrent protection, high set overcurrent protection or undervoltage protection is enabled. p=i&q+rnI Beginning of the submenu BLOCK ENABLED Enabling the block function Disabling the block function BLOCK mode CONTINUOUS PULSE STA TUS M F R 7SJ551 activates the block function during the activation of the block binary input MFR 7SJ551 activates the block function during the block time tBLoCK, after the activation of the block binary input only for motors; depending on motor status MFR 7SJ551 automatically activates the block function if the BLOCK mode CONTINUOUS is set, no further menu item appears. MFR 7SJ551 Operating instructions BLOCK activation time Setting range: p z q RUNNING 0 s to 166 min Block status If the block mode STATUS is set, this menu item appears. RUNNING STOPPED/START when the motor siatus is STOPPED or START, the block function is active, when the motor status is RUNNING, the block function is inactive when the motor status is RUNNING, the block function is active, when the motor status is STOPPED or START, the block function is inactive Disabling the BLOCK TIMERS ('block on pick-up'). There will be no alarm and no trip indication. Enabling the BLOCK TIMERS ('block on timers'). There will be an alarm indication after pick-up, but no trip. B L O C K U.C. I<: ENABLED BLOCK O.C. Enabling BLOCK UNDERCURRENT Disabling BLOCK UNDERCURRENT Enabling BLOCK LOW SET OVERCURRENT PHASE Disabling BLOCK LOW SET OVERCURRENT PHASE DISABLED BLOCK O . C . ENABLED /:i""": ENABLED 1- DISABLED ENABLED Enabling BLOCK HlGH SET OVERCURRENT PHASE Disabling BLOCK HlGH SET OVERCURRENT PHASE Enabling BLOCK LOW SET OVERCURRENT EARTH Disabling BLOCK LOW SET OVERCURRENT EARTH \ MFR 7SJ551 1 Operating instructions Enabling BLOCK HIGH SET OVERCURRENT Disabling BLOCK HIGH SET OVERCURRENT EARTH BLOCK U . V . ENABLED 6.8.18 ' Enabling BLOCK UNDERVOLTAGE Disabling BLOCK UNDERVOLTAGE EXTERNAL COMMAND With the external command function an immediate trip can be generated by activating a binary input, for example to make an emergency stop i m[ E X T . COMMAND 9 + I I I I Beginning of the submenu EXTERNAL COMMAND Enabling the external command Disabling the external command EXT. COMMAND Delay time Setting range: 0 s to 166 min After activating the external command binary input, the delay timer tEXTis started. If the binary input continues to be activated during tEXrl the external command output will be energized after tEXrhas elapsed. 6.8.19 ClRCUlT BREAKER POSITION With the circuit breaker position function the position of the circuit breaker can be indicated. i'"""'I:""i Beginning of the submenu CB POSITION CB P O S I T I O N + + Enabling the circuit breaker position annunciation Disabling the circuit breaker position annunciation * MFR 7SJ551 I Operating instructions After the circuit breaker position binary input is activated the c,ircuit breaker position LED indicator will be energized. Operating instructions MFR 7SJ551 6.9 Settings for TRANSIENT DATA mi- In the TRANSIENT DATA the operator determines how the fault recording is started. TRANSIENT + + Beginning of the submenu TRANSIENT DATA DATA Enabling the internal triggering of the data storage (triggering by fault) Enabling the external triggering of the data storage (triggering by binary input) INTERN 1 E.TERN . J. Data storage can be initiated by any protection function (INTERN). The actual storage time begins prematurely by a fixed pre-trigger time. Total storage time is three seconds. Data storage can also be initiated via a binary input. The storage is triggered dynamically, in these cases. Total storage time is three seconds. Storage criterion DATA STORAGE FAULT DETECTION TRIP The storage criterion can be the general fault detection (FD) or the trip command (TRIP). Especially for delay times larger than 3 seconds storage by trip can be desirable, as for storage by fault detection MFR 7SJ551 will not record sampling values at the trip instant. MFR 7SJ551 is equipped with a real time clock. In the REAL TIME CLOCK menu date and time can be altered. Furthermore, time synchronisation can be activated here. Beginning of the submenu REAL TIME CLOCK Setting the date format to day - month - year Setting the date format to month - day year FORMAT: OD-MM-- I [PRMAT: MM-DO-? - I I MFR 7SJ551 Operating instructions Date. Depending on the date format the date is set using the numerical keyboard. The dashes are put in automatically. The day after 31-12-99 will be 01-0100. Time The time is in European format (00:00:00 to 23:59:59). The colons are put in automatically. Disabling the real time clock synchronization Enabling the real time clock synchronization MFR 7SJ551 provides the possibility to synchronize the real time clock via a binary input. For this purpose a mother clock or a receiver for a DCF pulse must be connected. Energizing the binary input will set the seconds to zero. The minutes will be set to the nearest value. Example 1 A synchronizing pulse at 13:27:18 will set the real time clock to 13:27:00. Example 2 A synchronizing pulse at 13:27:48 will set the real time clock to 13:28:00. MARSHAkkiNG of binary inputs, binary outputs and LED indicators 6.1 1.I General As a factory setting the binary inputs, the binary outputs and the LED indicators are not marshalled. This means the relay will not be able to perform any protection function. The assignment of the different input and output criteria must be marshalled according to on-site conditions. When the firmware programs are running, the specific logic functions will be allocated to the physical input and output modules or LEDs in accordance with the selection. Exampie An earth fault is registered from the low set earth overcurrent time protection. This event is generated in the device as a START (logical function) and should be available at one or more of the output contacts, for example output relay 3. The microcontroller must be advised that the logical signal START E> should be transmitted to the output relay 3. Thus, when marshalling is performed two statements of the operator are important: 1. Which logical annunciation generated in the protection unit program should trigger an output relay? 2. Which output relay should be triggered by this logical annunciation? The trip relays can be assigned to more than one function. Up to 33 logical annunciations can trigger ! hAFR 7SJ551 I I @ Operating instructions one relay (maximum version), although this is not a realistic situation. One logical annunciation can be assigned to more than one output relay, up to the maximum number of output relays available. (namely blocking). The corresponding question to the operator is then: 1. Which signal to a binary input should initiate a reaction by the device? 2. Which reaction should be initiated? A similar situation applies to binary inputs. In this case external information (for example blocking of the I>> stage) is connected to the unit via an input module and should initiate a logical function The (optional) marshallable LED indicators can be assigned to more than one function. Up to 30 logical annunciations are permitted. Marshalling LED indicators is performed similar to marshalling output relays. One logical annunciation can be assigned to only one LED indicator. ~SETTIN~SI pmq+ + Beginning of the submenu MARSHALLING and of the submenu BINARY INPUT MARSHALLING + BINARY INPUT pOUTPUT % R E LTA Y S , q+ Beginning of the submenu OUTPUT RELAYS - , MARSHALLING Beginning of the submenu LED INDICATOR When the MARHALLING menu is left, the settings are permanently secured on EEPROM and protected against power outage 6.1 1.2 Marshalling of the BINARY INPUTS The unit contains 2 or 5 binary inputs (dependent on model) which are designated BINARY INPUT 1 to BINARY INPUT 5. They can be marshalled in the submenu MARSHALLING BINARY INPUT. 1 NORMALLY : :/EN MFR 7SJ551 Operating instructions NORMALLY CLOSED Beginning of the submenu MARSHALLING BINARY INPUT First a choice can be made for each individual input as to whether the assigned function should become operative in the NORMALLY OPEN mode or in the NORMALLY CLOSED mode: NORMALLY OPEN The control voltage at the input terminals activates the function. BINARY INPUT BLOCK: Control voltage present at the terminals turns off the function, control voltage absent activates the function. As a next step, each input function must be assigned to one binary input. Scrolling down the MARSHALL1NG BINARY INPUT menu the different functions appear. The normally open or normally closed status is displayed by 'NO' or 'NC' in the right upper corner of the display. By pushing the arrow right key 3 the binary input number can be set. E.ampie For assigning the BLOCK input signal to a binary input the menu appears as showed on the left. Binary inputs 2 and 4 are set normally closed. BINARY INPUT BINARY INPUT BINARY INPUT BINARY INPUT \L The following input functions will appear if the concerning protection functions have been enabled. Otherwise these functions will not appear. Refer to section 4 and 6.8 for a detailed description of these input functions REMOTE RESET For resetting the relay via a binary input instead of the RI key at the front. To obtain this possibility set the REMOTE RESET function to EXTERN. REMOTE RESET ENABLED a i MFR 7SJ551 Operating instructions This menu item will appear in the submenu MARSHALLING BINARY INPUT. If disabled no binary input assignment is requested. Enabling the remote reset Disabling the remote reset ?-adjust For adapting the warming-up time constants to onsite conditions. CURVE SWITCH For switching from overcurrent curve set 1 to overcurrent curve set 2. BLOCK For blocking the overcurrent, undercurrent or undervoltage characteristics. CW/CCW INPUT For adapting the calculation of inverse current and unbalance to the reverse rotation direction. First a choice has to be made in the MARSHALLING BlNARY INPUT menu whether the clockwise/counterclockwise determination is performed internally or externally. Rotating direction determination MODE CW/CCW INPUT INTERN INTERN MODE: E.TERN E.TERN 3, CW/CCW I N P U T IlFiREcT:oN: The direction of rotation is determined in the ne-t menu line. The direction of rotation is normally clockwise. The binary input signal will reverse the direction of rotation to counterclockwise, Rotating direction CLOCKWISE COUNTERCLOCKWISE After setting the mode to INTERN the rotating direction can be set. For reversing the direction the relay has to be reprogrammed. EMERGENCY RESTART For resetting the thermal reserve buffers to 100%. ZERO SPEED For protecting the motor against stalled rotor by connecting a binary tachometer to this ZERO SPEED binary input. BREAKER FAILURE TRlP For initiating start of the breaker failure trip by an external protection relay. The trip signal of the external protection device is coupled into MFR 7SJ551 via the BREAKER FAILURE TRlP binary input. E.TERNAL COMMAND For generating an immediate trip, for example to make an emergency stop. CIRCUIT BREAKER POSITION For indicating the position of the circuit breaker. When the binary circuit breaker position input is energized one of the rnarshallable LED indicators (assigned to circuit breaker position) will be illuminated. FAULT RECORDING For initiating data storage. SERIAL EVENT For passing on a binary signal serially to the station control system. * MFR7SJ551 ' I Operating instructions Example The input function SERIAL EVENT is assigned to normally open binary input 3. If binary input 3 is energized the relay will send away a serial message via its serial interface to the control system that binary input 3 has been energized. In the control system this message can be given a special meaning, for e,ample "cubicle door open". ' RTCSYNC For synchronizing the real time clock. 6.1 1.3 Marshalling of the OUTPUT RELAYS Dependent on the ordered model the unit contains 4 output relays or 6 output relays (with output 1 doubled). These outputs are make contacts. One (breaker) output contact signals the availability of the relay (MONITOR), its allocation cannot be changed. The six make contacts are designated OUTPUT-1 to OUTPUT 6 and can be marshalled in the menu MARSHALLING OUTPUT RELAYS. Multiple designations are possible, i.e. one logical annunciation function can be routed to several output relays and several logical annunciation functions can be routed to one output relay. Beginning of the submenu MARSHALLING OUTPUT RELAYS and of the submenu LATCH TIMERS Enabling the latching timer Disabling the latching timer If enabled output signals will be locked for a limited amount of time. MFR 7SJ551 Operating instructions Latching time t - r e s e t [sl Setting range: 0 s to 766 min The output relay will be locked until tEsethas elapsed. This menu line will only appear if the latching timer is enabled. First a choice can be made for each individual output relay as to whether it has to be locked after excitation or not: UNLATCHED 1 '1 LATCHED & UNLATCHED i I LATCHED After disappearing of the output condition the output relay will drop off. After disappearing of the output condition and elapsing of the latching time the output relay will drop off. OUTPUT R E L A Y Ne.t each output function must be assigned to one or more output relays. Scrolling down the MARSHALLING OUTPUT RELAYS menu the different functions appear to the left and the concerning output matrix lines to the right. The latched or unlatched status is displayed by ' - ' or '1 ' in the upper line of the display. By pushing the 0 to 6 numerical keys the desired output relay numbers can be set. By pushing the 0 to 6 numerical keys a second time the setting disappears. UNLATCHED Example For assigning the TRIP L>> output signal to output relays the menu appears as follows. Outputs 2 and 4 are set latched. mi T R I P L>>: --- T R I P L>>: 1 - - T R I P L>>: To assign output 1 and output 4 to the high set overcurrent trip signal push 1 and 4 once. If output 4 is set incorrectly and output 2 has to be set, push 4 again and push 2 once. 12- The following output functions will appear if the concerning protection functions have been enabled. Otherwise these functions will not appear. Refer to section 4 and 6.8 for a detailed description of these output functions. I MFR7SJ551 PRE-ALARM For annunciating the pre-alarm condition. The output will be energized after the thermal reserve has decreased to the warning level. TRIP 8-th For thermal overload trip and annunciation. The output will be energized after th,e thermal reserve has decreased to zero. START L I> For annunciating pick-up of the low set overcurrent protection function due to overcurrent in phase 1. START L2> For annunciating pick-up of the low set overcurrent protection function due to overcurrent in phase 2. START L3> For annunciating pick-up of the low set overcurrent protection function due to overcurrent in phase 3. START L> For annunciating pick-up of the low set overcurrent protection function due to overcurrent in one or more of the phases, TRlP b For low set phase overcurrent trip and annunciation. The output will be energized after the low set phase overcurrent delay time has elapsed. Operating instructions For directional earth fault trip and annunciation. The output will be energized after the low set earth overcurrent delay time has elapsed. START b> For annunciating pick-up of the high set overcurrent protection function due to short-circuit in one or more of the phases. TRlP L>> For high set phase overcurrent trip and annunciation. The output will be energized after the high set phase overcurrent delay time has elapsed. START e>> For annunciating pick-up of the high set stage of the directional earth fault protection function due to earth overcurrent in the protective direction. START For annunciating pick-up of the directional earth fault protection function due to earth overcurrent in the protective direction. TRlP e>> For high set earth overcurrent trip and annunciation. The output will be energized after the high set earth overcurrent delay time has elapsed. TRIP @>> For directional earth fault trip and annunciation. The output will be energized after the high set earth overcurrent delay time has elapsed. START e> For annunciating pick-up of the low set overcurrent protection function (or the directional earth fault protection function) due to earth overcurrent. ALARM UB For annunciating pick-up of the unbalance protection function. START @> For annunciating pick-up of the low set stage of the directional earth fault protection function due to earth overcurrent in the protective direction. TRlP UB For unbalance trip and annunciation. The output will be energized after the calculated unbalance delay time has elapsed. TRlP e> For low set earth overcurrent trip and annunciation. The output will be energized after the low set earth overcurrent delay time has elapsed. ALARM U c For annunciating pick-up of the undervoltage protection function. TRlP @> TRlP U< For undervoltage trip and annunciation. The output will be energized after the undervoltage delay time has elapsed. MFR 7 ~ ~ 5 5 1 , ALARM U> For annunciating pick-up of the low set overvoltage protection function. TRlP U> For low set overvoltage trip and annunciation. The output will be energized after the low set undervoltage delay time has elapsed. ALARM U>> For annunciating pick-up of the high set overvoltage protection function. TRlP U>> For low set overvoltage trip and annunciation. The output will be energized after the low set undervoltage delay time has elapsed. 7 i a I Operating instructions TRlP Ic For undercurrent trip and annunciation. The output will be energized after the undercurrent delay time has elapsed. le DIRECTION -> For annunciating the forward direction as determined by the directional earth fault protection. Be aware that this output function is not the trip condition of the directional earth fault protection! le DlRECTlON <For annunciating the backward direction as determined by the directional earth fault protection. Be aware that this output function is not the trip conditiori of the directional earth fault protection! START INHlBlT For preventing the motor circuit breaker to close before the motor regained sufficient thermal reserve again. ALARM ZERO SPEED For annunciating pick-up of the zero speed protection function. The output will be energized after the binary tachometer has energized the zero speed binary input. LOCKED ROTOR For locked rotor trip and annunciation. The output will be energized after the calculated locked rotor trip delay time has elapsed. TRlP ZERO SPEED For zero speed trip and annunciation. The output will be energized after the zero speed trip delay time has elapsed. ALARM T For annunciating temperature increase above the overtemperature alarm level. BREAKER FAILURE TRlP For breaker failure trip of the upstream circuit breaker and for annunciation. The output will be energized after the breaker failure trip time stage has elapsed. TRlP T For overtemperature trip and annunciation. The output will be energized as soon as the measured temperature crosses the overtemperature trip level. ALARMlc For annunciating pick-up of the undercurrent protection functibn. E.TERNAL COMMAND For immediate or delayed trip after the binary e.ternal command input is energized. The output will be energized after the external command trip delay has elapsed. 1 MFR785551 1 6.11.4 Marshalling of the BED INDICATORS (optional) I Operating instructions Dependent on the ordered model the unit contains 4 marshallable LED indicators. The allocation of the five standard LED indicators cannot be changed. The 4 marshallable LED indicators are designated LED 1 to LED 4 and can be marshalled in the menu MARSHALLING LED INDICATOR. Beginning of the submenu MARSHALLING LED INDICATOR MEMORIZED First a choice can be made for each individual LED indicator as to whether it has to be memorized after excitation or not: Ul'itl MEMORIZED I MEMORIZED '1 NO#-MEMORIZED After disappearing of the excitation condition the LED indicator will drop off. MEMORIZED After disappearing of the excitation condition the LED indicator will stay illuminated until it is reset. As a next step, each excitation condition must be assigned to one LED indicator. Scrolling down the MARSHALLING LED INDICATOR menu the different functions appear. The memorized or nonmemorized status is displayed by 'NM' or 'ME' in the upper line of the display. Initially the excitation functions are not marshalled, designated by '.'. By pushing the arrow right key the binary input number can be set. + Example For assigning the TRIP b>excitation signal to a LED indicator the menu appears as follows. LED indicators 2 and 4 are set latched. LED INDICATOR LED I N D I C A T O R -1 LED INDICATOR 1 :RIP L>>: '1 INDICATOR TRIP > : MFR 7SJ551 Operating instructions The following excitation functions will appear if the concerning protection functions have been enabled. Otherwise these functions will not appear. The excitation of the LED indicators is similar to a large extent to the energizing of the output relays. Refer to the output functions described briefly in the preceding section 6.1 1.3. Refer to section 4 and 6.8 for a detailed description of these output functions. 8 TRlP 8-th START L, TRlP b START e> START TRlP e> TRlP @> STARTb> TRlP b> START,>> START @>> TRlP e>> TRlP @>> ALARM UB TRlP UB ALARM U< TRlP U< ALARM U> TRlP U> ALARM U>> TRlP U>> START INHIBIT LOCKED ROTOR ALARM T TRlP T ALARM I< TRlP I< le DIRECTION -> le DIRECTION <ALARM ZERO SPEED TRlP ZERO SPEED BREAKER FAILURE TRlP EXTERNAL COMMAND One excitation function is available for LED indication only: CIRCUIT BREAKER POSITION For indicating the position of the circuit breaker. The LED indicator will be illuminated when the binary circuit breaker position input is energized. There is no use in setting a memorized LED indicator for CIRCUIT BREAKER POSITION. 6.12 Settings for SERIAL COMMUNICATION (optional) In the SERIAL COMMUNICATION menu the serial communication facility can be matched to the connected personal computer or station management system. Address number Setting range: 0 to 254 I " t MFR 7SJ551 Operating instructions With the relay address different relays incorporated in a control system can be distinguished from each other. Subaddress number Setting range: 0 to 254 The subadress is needed when the relay is incorporated in an elder Siemens SINAUT LSA station control system. Baudrate S E R I A L COMM. 1 A T E : 21 BAUDRATE: 138400 1 ;RATE: 21 BAUDRATE: Type of serial interface RS-485 or optical Both interfaces can be used for communicating with a personal computer or a control system. It is not possible to communicate with both interfaces at a time. The type of the serial interface set in this menu line should correspond to the communication link desired at that moment. Often the optical interface is connected to an inputloutput unit of the control system and the RS485 interface to a notebook. The normal type setting is OPTICAL then; only for setting and commissioning using a notebook the type setting is changed to RS-485. Most personal computers only provide a RS-232 interface for communication with the relay. To achieve communication the selected interface should be connected via a converter to RS-232. S E R I A L , COMM. DISABLED Enabling the SERIAL EVENT Disabling the SERIAL EVENT For passing on a binary 'serial event' input signal to the station control system. In the control system this message can be given a special meaning, for e.ample "cubicle door open". @ i Operating instructions MFR 7SJ551 Communication protocol P R T C L : VDEW- 2 LSA VDEW VDEW-erw S E R I A L COMM. DISABLED ILSA-protocol according to DIN 19244 international protocol according to IEC 870-5 international protocol according to IEC 870-5, e.tended with edra annunciations specific for MFR7SJ551 Disabling the serial communication BLOCK Enabling the serial communication BLOCK For commissioning it can be useful to prevent the relay from serial sending of analogue signal values. This is achieved by enabling the serial communication block. Thus, these messages cannot be confused with messages which occur during real operation. 6.13 Putting the relay into operative mode (ON LINE) When the relay is fully parametrized it must be set into ON LlNE mode to enable it to perform its protection tasks. All settings should be carefully checked. After starting in the OFF LlNE mode and selecting the OPERATING MODE the display will present the initial disolav. OPERATING OFF L I N E + Depressing the key will activate the operating mode menu part and the display will show: The symbol in the right corner of the lower te.t row is flashing. Depressing the backspace key will change the mode from OFF LlNE to ON LlNE and the display will present: O P E R A T i NG ON L I N E The red MONITOR LED indicator will drop off and the green ON LlNE LED indicator will illuminate. It is not possible to change any setting in the ON LlNE mode. Depressing any other key instead of the backspace key will cancel the setting to ON LlNE and the initial display will appear again. A R E YOU SURE and after appro.imately two seconds: ON L I N E OK ? BACKSPACE To set the relay back to OFF LlNE mode this identical procedure has to be followed again. I I I I Operating instructions MFR 7SJ551 6 4 Annunciations 6.1 4.1 Introduction After a network fault, annunciations and messages provide a survey of important fault data and the function of the relay, and serve for checkina sequences of funciional steps during testing and commissioning. Further, they provide information about the relay itself during normal operation. The annunciations generated in the relay are present in various ways: - LED indications in the front plate of the relay (figure 6.1). I - Binary outputs via the connections of the relay. - Indications in the display on the front plate or on the screen of a personal computer, via the serial interface (optional). - Transmission via the serial interface to local or remote control facilities Most of these annunciations can be relatively freely allocated to the LED indicators and binary outputs (see section 6.1 1). To call up annunciations on the operator panel scroll to the concerning submenus. I I pq.+ ON L I N E MEASURED VALUES lndication of operational measured values (currents, voltage, thermal reserve, etc.). COUNTERS Annunciation for circuit breaker operation statistics, that is counters for tripping commands and accumulated short-circuit currents. ALARMITRIP DATA Event annunciations for the last three network faults. I/ONl+ RUNNING HOURS MANUFACT. ON L I N E DEMAND AMPERE METER Dynamic and maximum 8 minutes and 15 minutes averages of the measured currents. RUNNING HOURS Actual running hours (since previous start-up) and total running hours. MANUFACTURING DATA Ordering code, serial number and software version. i MFR 7SJ551 @ 6.14.2 Operating instructions MEASURED VALUES The steady state RMS operating values can be read out any time in the submenu MEASURED VALUES. submenu CHANNELS as described in section 6.7. In the following menu description only values zero are shown. In practice the actual values appear. The data are displayed in absolute primary values. To ensure correct primary values, the rated data must have been entered to the device in the Some of the described menu items only appear when corresponding functions are enabled or available (if ordered as option). Operational current values Depending on the magnitude the current unit is A or kA. 8 .ooo I RMS V A L U E S .ooo J, 1- RMS V A L U E S .ooo + Operational voltage value Depending on selected circuit type, residual voltage, line-to-line voltage or phase to earth voltage is displayed. Depending on the magnitude the voltage unit is V or kV. RMS V A L U E S nnn Earth fault component for directional earth fault protection. Depending on the selected measuring principle (COSINE or SINE) here the value 1,. cos $ or I, sin Q is displayed. Thermal reserve ON LINE 8-rotor [%I For motors the rotor thermal reserve and the stator thermal reserve are displayed. For non-rotating objects there is only one thermal reserve buffer, denominated with "8- t h". ' MFR 7SJ551 I Operating instructions I ][THERMAL ---- -. .- The displayed true root mean square current is . . . t-.h. -e hinhest n . .lomentary phase current used by the . ., \L - True RMS current - thermal overload function. As this contains all harmonic components a small noise current will be displayed even when there is no actual operation current. Inverse current The inverse current is calculated out of the three phase currents according to the symmetric components method. .I. 1 + TEMP 1 L O C I TEMPERATURES TEMP 2 C ° C l Temperatures The temperatures are measured by the 2 or 8 RTD elements and processed in the interface unit (optional). When these menu lines are recalled, the interface unit will send the temperature values to the relay unit. This will take a short moment, in which 4 stars "****"are shown instead of a temperature value. TEMPERATURES TEMP 8 [ O C l \I/ TEMPERATURES AMBIENT[OCI & m//+ml Motor status I I - STOPPED, START or RUNNING Refer to section 4.8 for a detailed description. " MFR 7SJ551 6.14.3 ' Operating instructions COUNTERS The submenu COUNTERS provides circui.t breaker operation statistics. Counter status and stores are secured against auxiliary voltage failure. . m+ml rn 08-97 4 + ALARM COUNTER GENERAL: n= the Beginning last time of the the counters submenuwere COUNTERS. reset is displayed. After that, The alarm counters show the total number of alarms since the last reset date, and further the number of alarms due to phase current faults, earth current faults and voltage faults. ALARM COUNTER EARTH: n= VOLTAGE: n= \L The number of trip commands initiated by 7SJ551 is counted. Additionally the interrupted currents are accumulated and stored. To reset the counters the backspace key has to be used. Resetting counters is possible in ON LINE mode. RESET The symbol in the right corner of the lower text row is flashing. Depressing the backspace key will set all counters back to zero. A new COUNTERS RESET DATE is stored. Depressing any other key instead of the backspace key will cancel the reset and the COUNTERS RESET display will appear again. 6.14.4 ALARM I TRIP DATA The annunciations which occurred during the last three networks faults can be read off in the front panel or via the serial interface. When a further fault occurs, the data relating to the eldest are I erased. These annunciations can be read off in the submenu ALARMrrRlP DATA. Only fault annunciations related to available and enabled functions will appear in this menu. I 1 8 MFR 7SJ551 Operating instructions I I There are two separate fault data buffers, one for the last three alarms and one for the last three trips. The different alarms and trip buffers are numbered separately. Example Alarm number 23 has nothing to do with trip number 23 (or only by coincidence). In most cases more alarms than trips occur, so alarm protocol number 23 will probably concern the same fault as trip protocol number 15. To match the alarm protocol and the trip protocol concerning the same network fault the RTC ALARM TlME and the RTC TRIP TlME should be compared. The submenu ALARM DATA gives an overview of the status of all enabled protection functions. Beginning of the menu ALARM/TRIP DATA and of the submenu ALARM DATA. Display of the most recent alarm number, designated with In'. Depress key to recall the two preceding alarm the protocols, designated with 'n-1' and 'n-2'. + Alarm date and time Refers to the moment of pick-up of one of the protection functions. ALARM C I R C U I T Alarm circuit \L In this menu part the measuring circuits are indicated via which a fault has been detected. 1.000 \L OVERTEMPERATU UNBALANCE .ooo 4 UNDERCURRENT LOW S E T O . C . .ooo H I G H SET O . C . I I : LOW S E T O . C . • , MFR 7SJ551 \ Function status and alarm or trip duration time. In these menu lines all enabled functions and their states at the moment of pick-up are displayed. The following three states are possible: 8 --- No alarm. The concerning function did not detect a fault. ALM Alarm. The concerning function had detected a fault but did not trip. The displayed time is the time between pick-up of the function and drop off of the alarm condition. TRP Trip. The concerning function had detected a fault and tripped. The displayed time is the time between generation of the trip signal and drop off of the trip signal. Be aware that the displayed time is not the reaction time of the relay, but the total time a Operating instructions MFR7SJ551 o p e r a k g instructions LOCKED ROTOR function is in ALARM state or the total time a function is in TRlP state. This means the displayed time contains the circuit breaker reaction time. .OOO ZERO SPEED .OOO \L UNDERVOLTAGE ,000 For the thermal overload protection the tripping time recording differs. Counting of the TRlP time starts when the thermal reserve has decreased to the warning level Ow,,. Counting stops when the thermal overload function has taken up the TRlP state and the thermal reserve has increased to the again. warning level, , ,8 m: OVERVOLTAGE > OVERVOLTAGE .ooo E.T. COMMAND .ooo \L Beginning of the submenu TRlP DATA and display of the most recent trip number, designated with 'n'. key to recall the two preceding trip Depress the protocols, designated with 'n-1' and 'n-2'. + RTC T R I P DATE 08-97 J Trip date and time Refers to the moment of trip of one of the protection functions. Operational values at the moment of trip For each recorded operational quantity the value is displayed at the moment of trip by one of the protection functions. Refer to section 6.14.2 for a description of the operational measurements. a i " r MFR 7.9551 Operating instructions Calculated values of the current components accordinq to the symmetrical components method. For 2-phase connection the menu item ' I - T R I P - : 0 s eq" disappears and an e.tra menu item appears, namely "UB 1 2 - T R I P". /11 ~ ~ 0 - ~ ~ 1 ~ - r o t o For r anooo [%I 8-TRIP-stator motors the rotor thermal reserve and the stator thermal reserve are displayed. For non-rotating objects only one value is displayed, denominated by " 6 - T R I P". .ooo Temperature values at the moment of trip .ooo TEMPERATURE 2 .ooo J, TEMPERATURE 8 .ooo 6.14.5 DEMAND AMPERE METER The submenu DEMAND AMPEREMETER provides display of - the dynamic 8 minutes average of the measured currents - the maximum 8 minutes average of the measured currents since the last reset - - the dynamic 15 minutes average of the measured currents the maximum 15 minutes average of the measured currents since the last reset. Beginning of the submenu DEMAND AMPEREMETER. After that, the last time the meter was reset is displayed. Eight minutes average of the measured currents This is the calculated average of the three root mean square phase currents over the last eight minutes. Eight minutes maximum of the measured currents. AMMETER 0 & This is the highest eight minutes average since the last reset. This allows the user to check correct dimensioning of network components. , G88700-C3527-07-7600 147 I MFR 7SJ551 Operating instructions Fifteen minutes average of the measured currents This is the calculated average of the three root mean square phase currents over the last fifteen minutes. " r Operating instructions MFR 7SJ551 Fifteen minutes maximum of the measured currents This is the highest fifteen minutes average since the last reset. This allows the user to check correct dimensioning of network components. 15m-MA CAI 3. I ~ I 1 AMMETER KESET, + A R E YOU S U R E RESET COUNTERS ? BACKSPACE 8 To reset the demand ampererneter the backspace key has to be used. Resetting the demand amperemeter is possible in ON LINE mode. I RUNNING HOUWS The submenu RUNNING HOURS provides display of the actual running hours (since previous startup) of the motor and of the total running hours since last reset. This menu will only appear when the DEVICE TYPE is set to ROTATING. Beginning oi the submenu RUNNING HOURS. After that, the last time the meter was reset is displayed. RUNNING HOURS ACTUAL [ h l \I, R U N N I N G HOURS \I, I , The symbol in the right corner of the lower text row is flashing. Depressing the backspace key will set the values back to zero. A new DEMAND AMMETER RESET DATE is stored. Depressing any other key instead of the backspace key will cancel the reset and the DEMAND AMMETER RESET display will appear again. 6.14.6 I Actual running hours since previous start-up The time unit is minutes or hours. The value will be reset to zero automatically when MFR 7SJ551 detects a new start. Total running hours since last reset. The time unit is minutes or hours. The value can only be set to zero by resetting it in the next menu line. 1 MFR 7SJ551 Operating instructions El+ R U N N I N G HOURS RESET RUN HRS? ARE Y O U SURE RESET RUN HRS? T Y P E BACKSPACE To reset the running hours counter the backspace key has to be used. Resetting the running hours counter is possible in ON LlNE mode. I The symbol in the right corner of the lower text row is flashing. Depressing the backspace key will set the values back to zero. A new RUNNING HOURS RESET DATE is stored. Depressing any other key instead of the backspace key will cancel the reset and the RUNNING HOURS RESET display will appear again. 1 6.14.7 MANUFACTURER DATA In the submenu MANUFACTURER DATA, ordering code, serial number and software version can be read out. I In OFF LINE mode the submenu DEFAULT VALUES will be part of the MANUFACTURER DATA menu. Refer to section 6.15 for a detailed description of how to reset all settings to default values. Beginning of the submenu MANUFACTURER DATA Ordering code I As an example here the maximum version with sensitive earth current measurement is shown. The last character of the ordering code can be A, 8, C or D, depending on the ordered interface unit. If the interface is ordered later or if this relay is part of a batch delivery, this character will be A. In this case, after mounting the interface unit the displayed last character of the ordering code will stay " A . This has no influence on the good operation of the relay. Serial number Here the serial number of the relay unit is displayed. If the relay unit is inserted in an other housing the serial number of the relay unit and the housing wiil differ. Refer to this menu read-out serial number in your correspondence. (This serial number is also registered on a sticker on the draw-out module.) I MFR 7SJ551 Operating instructions Firmware version relay unit Behind the firmware version the date of release of this firmware is shown. Firmware version interface unit This menu line will only appear when there is an interface unit connected. Behind the firmware version the date of release of this firmware is shown, together with the ordering type (the last character of the ordering code: B, C or D). Self-monitoringannunciation Normally here "NO ERRORS" can be read. The following messages are shown when the relay has an internal failure. (Refer to section 7.3 for a detailed description.) HW: AUX. SUPPLY HW: EZPROM H W: RAM HW: REF.VOLTAGE HW: ROM HW: TRIP COIL SW: MLFB SW: SW ERROR 6.15 I Resetting all settings to factory settings MFR provides the possibility to reset a parameters back to factory settings. Therefore the submenu DEFAULT VALUES has to be recalled. This submenu will only be available in OFF LINE mode. Initialization of the parameter memory has to be executed always after firmware exchange (EPROM set). 1 MFR 7SJ551 Operating instructions pql+ I N I T MEMORY To initialize the memory the backspace key has to be used. A R E YOU SURE Depressing the backspace key will lead to a new dialogue line, in which the initialization action has to be reconfirmed. I N I T MEMORY BACKSPACE n RECONFIRM The symbol in the right corner of the lower text row is flashing. Depressing the backspace key will set all parameters back to initial settings. A R E Y O U SURE I N I T MEMORY BACKSPACE I 1 Depressing any other key instead of the backspace key will cancel the initialization and the INIT MEMORY display will appear again. While initializing, the display will look as showed on the left; the lowest line shows a 'running' row of symbols. ***** DONE After approximately 15 seconds the display will show that it is finished. After pressing a key the relay will start up again. After initialization the relay must be parametrized according to on-site conditions. The default values are used in the settings description of the preceding sections. * MFR 7SJ551 0 6.16 Testing and commissioning 6.16.1 General Prerequisite for commissioning is the completion of the preparation procedures detailed in sections 5 and 6. /;\ Warning Hazardous voltages are present in the electrical equipment during operation. Non-observance of the safety rules can result in personal injury or damage. Only qualified personnel shall work on and around this equipment after becoming thoroughly familiar with all warnings and safety notices of this manual as well as with the applicable safety regulations. Particular attention must be drawn to the following: - The earthing screw of the device must be connected solidly to the protective earth conductor before any other connection is made. - Hazardous voltages can be present on all circuits and components connected to the supply voltage or to the measuring and test quantities. - Hazardous voltages can be present in the device even after disconnection of the supply voltage (storage capacitors!). - The limit values given in the Technical data (section 3) must not be exceeded at all, not even during testing and commissioning. When testing the unit with a secondary injection test set, it must be ensured that no other measured values are connected and that the tripping leads to the circuit breaker trip-coils have been interrupted. m A DANGER! i Operating instructions Secondary connections of the current transformers must be short-circuited before the current leads to the relay are interrupted! If a test switch is installed which automatically short-circuits the current transformer secondary leads, it is sufficient to set this switch to the "Test" position. The short-circuit switch must be checked beforehand. It is recommended that the actual setting for the relay be used for the testing procedure. If these values are not (yet) available, test the relay with the factory settings or reasonable alternatives. In the following description of the test sequence values will be used that will be stated with each test. For almost all functional tests a single-phase current source is sufficient. However, if asymmetrical currents occur during the test and the unbalance protection has been selected, it is likely that the unbalance protection will frequently operate. This is of no concern because the condition of steady-state measured values is monitored and, under normal operating conditions, these are symmetrical: under short circuit conditions the unbalance protection will normally not activate a trip command (depending on the concerning delay timers). For testing the rotor thermal overload function and the unbalance function a three phase current source IS necessary. NOTE!The accuracy which can be achieved during testing depends on the accuracy of the testing equipment. The accuracy values specified in the Technical data can only be reproduced under the reference conditions set down in IEC 255 or VDE 0435/ part 303 resp. and with the use of precision measuring instruments. The tests are therefore to be iooked upon purely as functional tests. During all the tests it is important to ensure that the output relay contact(s) close (during a trip command activation), that the proper indications appear at the LED'S and the output relays for remote signalling. If the 7SJ551 relay is connected to a central memory device via the serial interface, correct communication between the relay and the master station must be checked. one hundred fifty-one and 00/100 E I MFR 7SJ551 i Operating instructions Stored indications are not erased automatically with a new pick-up of the relay or replaced by new annunciations. For a clear overview the LED indicators should therefore be reset after each test. Reset at least once by both of the possible methods: the reset key RI on the front plate or via the remote reset binary input (if this function has been selected). All described tests are done with a setting for a ROTATING device, because than all the protection functions are available. 1 6.16.2 Parameter L1 L2 L3 In CT RATIOph e Uin U select un VT-RATIO I i // Caution For the normal current circuits, test currents larger than 6 times I, and for the I, sensitive current circuit, test currents larger than 4 times In may overload and damage the relay current input channels if applied continuously. Observe a cooling period if necessary. Move to the menu part MEASURED VALUES (ON LINE) and select the menu part RMS-values on the display. Setting CHANNELS [en 0 Testing the measurement of operational values Parametrize the relay according to the following settings. CT RATIO, For a NON-ROTATING device the described methods of testing are equally valid, in some cases however they will be simpler. ENABLED ENABLED ENABLED I 150 ENABLED I On injecting the nominal value In = 1 A alternately in the different 1 A phase and earth leads, the correct RMS value of 150 A must be calculated and shown on the display. On administering the nominal secondary value of 110 V to the 110 V lead, the correct RMS value of 6.6 kV must be calculated and shown on the display. 150 ENABLED U,, or Uph or Uo 110 60 2 one hundred fifty-two and 00/100 G88700-C3527-07-7600 MFR 7SJ551 6.16.3 Operating instructions Testing the motor status Parametrize the relay according to the following settings. Setting Parameter DEVICE DATA Iflc DEVICE TYPE lno load CHANNELS L1 L2 L3 6.16.4 1.oo . I, ROTAT ING .I00 A ENABLED , ENABLED ENABLED Move to the menu part MEASURED VALUES (ON LINE) and select the menu part MOTOR STATUS on the display. With no current injected the display shows: 'STOPPED'. MFR 7SJ551 derives the motor status out of the level,,I = 1.I 25 . I, and the level ,I ol ,d. On injecting the value I = 1. I 2 A in one of the 1 A leads, the display should still show: 'STOPPED'. Raise the injected current over 1.I25 A. The display should show: 'START'. Decrease the current to In, (1.OO A). The relay should show: 'RUNNING'. Decrease the current under InOload. The display should show 'STOPPED'. Testing the rotor thermal overload protection Parametrize the relay according to the following settings. Parameter DEVICE DATA Ific DEVICE TYPE Istart tsart kin" nwarm bold CHANNELS L1 L2 L3 1, PROTECTIONS THERMAL OVERLOAD 7.1 ,stat Pweight cstop,mt START INHIBIT EMERGENCY RESTART ( Setting 1.oo . ,I ROTATING 4.00 . I, 10.0 s 5.00 2 3 For testing the rotor thermal overload function a three-phase test case is required. Disable all other protection functions. Set the stator thermal overload to a very large time constant to be sure it will not trip earlier than the rotor thermal overload protection. Marshall the thermal overload protection to one of the output relays. For test-purposes it is recommended to marshall the emergency restart function to one of the inputs, in order to be able to reset the rotor thermal reserve manually back to 100%. ENABLED ENABLED ENABLED ENABLED 999 min 1.oo 2.00 ENABLED ENABLED Checking the steady state rotor thermal reserve Move to the menu part MEASURED VALUES (ON LINE) and select the menu part THERMAL RESERVE ROTOR on the display. Initially the displayed value will be 100% (Ipreload.rOtor = 0). Inject a symmetric three-phase current I = 1.20 A. The rotor thermal reserve will decrease. The steady state value can be calculated out of the formulas for the rotor thermal overload protection: G88700-C3527-07-7600 one hundred fifty-three and 00/100 * I Operating instructions MFR 7SJ551 Trotor . f start -"cold = In(l - -3'10'0 - 3 . I-OO)" 'Kc - -r;o;" 1 =144,5s (4.00)' start First the equivalent heating current is calculated. For a symmetric current only a normal component will result: = liorm+ kin, . ltv= liorm+ 5 . ifnv= 1' = (120)~= 1.44 Substituting this value in the basic iterative equation gives: steady state value of the thermal rotor current will be the injected current: The formula for the rotor thermal reserve is: eth,rotor (t) = k?otor 2 - lth,rotor (t) . O o S -3 0 G o t o r .CI:I ~?lc -1 ,r o t o r oOoo , 3.0 0 The steady state thermal reserve will be: Check if the displayed value for the rotor thermal reserve decreases to 52.0%. Checking the trip time (cold condition) Check the trip time with cold condition (8th,rotor= 100%). Inject a symmetric three-phase overload current I = 3.00 A (step function). The equivalent heating current will be 3.00 A, as there is no inverse component. The trip time follows out of the formula: After trip the thermal reserve can be set back to 100% by energizing the emergency restart input. Checking the trip time (warm condition) Now check the trip time with a preload of 80%. The preload current Ipreload,rotor can be calculated out of the From: preload percentage 6preload,rolor. it follows: epreload,rotor - erel load, rotor - k:otor ' 0°% .I?IC Ipreload,rotor = krotor . l f l c epreload, rotor ' p = -10O0h &.1.00~=1.55 A Applying the preload current I = 1.55 A for a long time will eventually result in a steady state rotor thermal reserve of 20%. For test purposes a higher current can be injected until the display value is 20%. one hundred fifty-four and 00/100 G88700-C3527-07-7600 MFR 7SJ551 Operating instructions Starting from 20 % rotor thermal reserve, raise the symmetric three-phase current stepwise to I = 3.00 A. The trip time will be: Checking the trip time characteristic lnject the following symmetric three phase injecting currents and check the tripping times. Be sure the thermal reserve is back at the initial value before each time measurement. '1 (s) preload = 0 376.1 94.5 58.6 40.6 30.0 23.2 I (A) ftrip 1.80 2.50 3.00 3.50 4.00 4.50 ttrip (s) preload = 80% 180.6 24.4 13.7 9.0 6.5 4.9 Checking the trip time with asymmetrical current Start with cold condition (Bth,,,or = 100%). Inject a asymmetric overload current by injecting only two phases with lphase = -' 3.00 = 2.60 A (step function). This simulates the situation in which one phase of a symmetric three 2 phase current of 3.00 A is interrupted. The normal and inverse components are 1.50 A then. First the equivalent heating current is calculated. The trip time follows out of the formula: t trip = Trotor ' In ~Eeating- ~ ~ r e i o arotor d. Ceating 1 - kktor 1';c =14'4.5 .In 1 3.5 -(o)~ 13.5 - 3 . (1.00)~ = 36.3 s Checking the rotor cooling down time lnject a symmetric three phase current of 3.00 A for 26.3 s. The stator thermal reserve will decrease to 50%. Then decrease the current to 1.22 A. The steady state stator thermal reserve will be 50% then: Now take away the current. The motor status will change to 'STOPPED', which means the rotor cooling down factor will be incorporated. Check if the time to cool down to 75% is approximately 200 s: tcoal down 2 l?h,rotor(t cool down = Ipreload,rotor ' G88700-C3527-07-7600 '=,~~.rot '%tor -- cool down = 1.50 . e 2.00.'44.5 = 0.75 t cool = 200.3 s one hundred fifty-five and 00/100 MFR 7SJ551 6.16.5 Operating instructions Testing the stator thermal overload protection Parametrize the relay according to the following settings. Parameter DEVICE DATA lflc DEVICE TYPE b a t CHANNELS L1 L2 L3 In PROTECTIONS THERMAL OVERLOAD 71,stat %,stat PweighI Cstop,stat am START INHIBIT EMERGENCY RESTART Setting 1.oo . I, ROTATING 1.10 For testing the stator thermal overload function a single-phase test case is sufficient. Disable all other protection functions. Marshall the thermal overload protection to one of the output relays. For test-purposes it is recommended to marshal1the emergency restart function to one of the inputs, in order to be able to reset the stator thermal reserve manually back to 100%. ENABLED ENABLED ENABLED I ENABLED 100 s 200 s 500 2.00 25% ENABLED ENABLED Checking fhe sfeady sfate stator thermal reserve Move to the menu part MEASURED VALUES (ON LINE) and select the menu part THERMAL RESERVE STATOR on the display. Initially the displayed value will be 100% (Ipreload,stator = 0). Inject a current I = 0.80 A in one of the phase leads. The stator thermal reserve will decrease. The steady state value can be calculated out of the formulas for the stator thermal overload protection. The basic iterative equation Fort = 03 the steady state value of the thermal stator current will be the injected current: The formula for the stator thermal reserve is: The steady state thermal reserve will be: Check if the displayed value for the stator thermal reserve decreases to 47.1%. one hundred fifty-six and 001100 G88700-C3527-07-7600 " I Operating instructions MFR 7SJ551 Checking the trip fime (cold condition) Check the trip time with cold condition (Bth,sta,or = 100%). Inject an overload current I = 1.50A (step function). I The trip time follows out of the basic iterative equation for the thermal stator current /th,stat- The trip condition is: By filling in different trip times the corresponding injecting current can be found. In this case the trip time will be 108 s. After trip the thermal reserve can be set back to 100% by energizing the emergency restart input. Checking the trip time (warm condition) Now check the trip time with a preload of 80%. The preload current Ipreioad,stator can be calculated out of the preload percentage 8prejoad,statar. From: Efth,stator(t = kEtat m, = . ~ f l c- ~Ereload,stator kgtat . i00% .l?Ic it follows: epreload,stator - Itreload,stator kztat . ~:,c ' Ipreload,stator = kstat 00% ,/ ro ; ; ; ; l ; r " ' lflc ' = 1.1 .1.00. = 0.98 A Applying the preload current I = 0.98 A for a long time will eventually result in a steady state stator thermal reserve of 20%. For test purposes a higher current can be injected until the display value is 20%. Starting from 20 Oh stator thermal reserve, raise the current stepwise to I = 1.50A. The trip time will be 29 s. Checking the trip time characteristic lnject the following currents and check the tripping times. Be sure the thermal reserve is back at the initial value before each time measurement. I Check via the MEASURED VALUES menu if the PRE-ALARM and ALARM LED indicators light up when the stator thermal reserve reaches 25%. (s) 1 (A) trip 1.15 1.25 1.50 1.75 2.50 3.00 381.9 21 7.3 107.7 69.0 29.0 19.4 preload = 0 ttrip (s) preload = 80% 167.2 73.6 29.0 17.0 6.5 4.2 Checking the stator cooling down time lnject a current of 2.00A for 22.1 s. The stator thermal reserve will decrease to 50%. Then decrease the current to 0.78A. The steady state stator thermal reserve will be 50% then: ) G88700-C3527-07-7600 one hundred fifty-seven and 0011 00 MFR 7SJ551 Operating instructions Now take away the current. The motor status will change to 'STOPPED', which means the stator cooling down factor will be incorporated. Check if the time to cool down to 75% is approximately 193 s: tcwldown ]%,stat(t coal 2 dew" = IIpreioad,stator 0.500 . e --boo1down 2.00~100 Cstop,stat .?l.stat + (1 - ' + 0.500 . e one hundred fifty-eight and 001100 = 0.3025 tcool down , weight ). Cstop.sta1 '72.stat 1 = t cool down = 192.5 s G88700-C3527-07-7600 Operating instructions MFR 7SJ551 * 6.16.6 Testing the thermal overload protection of non-rotating objects Parametrize the relay according to the following settings. Parameter DEVICE DATA Iflc DEVICE TYPE k CHANNELS L1 L2 L3 In 1 Setting 1.oo . I" NON-ROTATING 1.I0 1 For testing the thermal overload function a singlephase test case is sufficient. Disable all other protection functions. Marshall the thermal overload protection to one of the output relays. ENABLED ENABLED ENABLED 1 ENABLED PHASE I00 s 200 s ,500 ENABLED 2.00 25% Checking the steady state thermal reserve Move to the menu part MEASURED VALUES (ON LINE) and select the menu part THERMAL RESERVE on the display. Initially the displayed value will be 100% (Ipreioad = 0). Inject a current I = 0.80 A in one of the phase leads. The thermal reserve will decrease. The steady state value can be calculated out of the formulas for the thermal overload protection. The basic iterative equation is: Fort = = the steady state value of the thermal current will be the injected current: 2 Ith(t = m) = 0.64 The formula for the thermal reserve is: The steady state thermal reserve will be: Check if the displayed value for the thermal reserve decreases to 47.1%. G88700-C3527-07-7600 one hundred fifty-nine and 001100 i MFR7SJ551 -Operatinginstructions Checking the trip time (cold condition) Check the trip time with cold condition (eth= 100%)- Inject an overload current I = 1.50 A (step function). 1 The trip time follows out of the basic iterative equation for the thermal current It. The trip condition is: By filling in different trip times the corresponding injecting current can be found. In this case the trip time will be 108 s. Checking the trip time (warm condition) Now check the trip time with a preload of 80%. The preload current percentage .,1,,8 From: 1 can be calculated out of the preload Applying the preload current I = 0.98 A for a long time will eventually result in a steady state thermal reserve of 20%. For test purposes a higher current can be injected until the display value is 20%. 1 Starting from 20 % thermal reserve, raise the current stepwise to I = 1.50 A. The trip time will be 29 s. i Checking the trip time characteristic lnject the following currents and check the tripping times. Be sure the thermal reserve is back at the initial value before each time measurement. Check via the MEASURED VALUES menu if the PRE-ALARM and ALARM LED indicators light up when the thermal reserve reaches 25%. 1 , 1 (A) ttnp (s) ttnp (s) 1.15 1.25 1.50 1.75 2.50 3.00 381.9 217.3 107.7 69.0 29.0 19.4 167.2 73.6 29.0 17.0 6.5 4.2 preload = 0 preload = 80% Checking the adjustment factor Inject a current of 2.00 A for 22.1 s. The thermal reserve will decrease to 50%. Then decrease the current to 0.78 A. The steady state thermal reserve will be 5O0/0then: one hundred sixty and 00/100 G88700-C3527-07-7600 MFR 7SJ551 Operating instructions Now energize the binary tadjinput. As the thermal reserve is in steady state this will have no influence. Now take away the current. Check if the time to cool down to 75% is approximately 193 s: tcoal down --tcooi down f h (t cool down) 2 = lpreioad . 0.500 . e 6.16.7 --tcooldown 2.oo.lao cadi .'=I + - Pweight ) - 1 ' tcoal down + 0.500 . e *.00.2°0 = 0.3025 tcooldown = 192.5 s Testing the ambient temperature biasing Parametrize the relay according to the following settings. Parameter DEVICE DATA Iflc DEVICE TYPE k PROTECTIONS THERMAL OVERLOAD AMBIENT TEMPERATURE Tm, Tmin INPUT SENSOR Setting 1.oo . I, NON-ROTATING 1.10 Disable all other protection functions. Connect an RTD sensor simulator to input sensor connection 1. The thermal protection will take into account the simulated temperature by the RTD simulator in determining the thermal reserve. Refer to section 4.3 for a detailed description. ENABLED ENABLED 120 "C 40 "C 1 -- Simulate a temperature above 120 "C.Check if the thermal reserve is 0%. Make sure the input currents are zero and there is no preload. Simulate a temperature of 20 "C. 'ambient - Tarnbient - Tmin . k2 . 1Ec = Tmax -Trnin - 40 . (1.1 C))2 . (1.00)~= -0,3025 120 - 4 0 Check if the thermal reserve in cold condition is 125%. 6.16.8 Testing the start inhibit G88700-C3527-07-7600 one hundred sixty-one and 001100 Operating instructions MFR 7SJ551 Parametrize.the relay according to the following settings. Parameter DEVICE DATA Iflc DEVICE TYPE Istart tstart nwarrn n ~ ~ l d CHANNELS L1 L2 L3 1" PROTECTlONS THERMAL OVERLOAD Setting 1 .oo . In ROTAT ING 4.00 . In 10.0 s 2 3 ENABLED ENABLED ENABLED 1 %,stat Pweig~ START INHIBIT tinh ENABLED 999 min 200 s 1.OO ENABLED 5s @stator 50.0% 71.stat Marshall one of the output relays to the protection function start inhibit. Disable all other protection functions. Checking the rotor start inhibit For testing the rotor thermal overload function a three-phase test case is required. 1 The rotor start inhibit level is calculated out of: Inject the relay with a three-phase current of 3.00 A. Take away the current when the rotor thermal reserve is smaller than 35.7%. Check if the start inhibit output relay closes. After cooling off again to a thermal reserve of 35.7% the delay time of 5 seconds starts. Check this delay time. Checking the stator start inhibit Now change the stator thermal overload settings to: Parameter 71,stat %,stat Pweiaht 1 Setting I00 s 200 S .500 For testing the stator start inhibit a single-phase test case is sufficient. I Inject the relay with a current of 2.00 A. Take away the current when the stator thermal reserve is smaller than 50.0%. Check if the start inhibit output relay closes. After cooling off again to a thermal reserve of 50.0% the delay time of 5 seconds starts, after which the start inhibit output is released again. Check this delay time. 6.1 6.9 Testing the emergency restart I Parametrize the relay according to the settings of the preceding section 6.1 6.8. one hundred sixty-two and 00/100 Enable the EMERGENCY RESTART function. Marshall the EMERGENCY RESTART function to one of the binary inputs. G88700-C3527-07-7600 MFR 7SJ551 Operating instructions Inject a current of 2.00 A and take away the current when the stator thermal reserve is smaller than 50%. 6.16.10 Energize the binary emergency restart input. Check if the rotor thermal reserve and the stator thermal reserve are set back to 100%. Testing the 6velltemperature protection Parametrize the relay according to the following settings. Parameter PROTECTIONS OVERTEMPERATURE ALARM 1 TRIP 1 ALARM 2 TRIP 3 Setting ALARM 8 TRIP 8 ENABLED 70 "C 100 "C 70 "C I 0 0 "C 1 70 "C 100 "C 6.16.1 6 Testing the undercurred78 protection i Parametrize the relay according to the following settings. Parameter DEVICE DATA lflc DEVICE TYPE lno load CHANNELS L1 L2 L3 In PROTECTIONS UNDERCURRENT fbypass I< t I< Setting 1.OO . In ROTATING 0.1 A ENABLED ENABLED ENABLED I ENABLED 5.00 s .500 3.00 s Marshall the OVERTEMPERATURE ALARM condition to one of the output relays. Marshall the OVERTEMPERATURETRlP condition to one of the other output relays. Disable all other protection functions. The tested sensor must be disconnected and replaced by a RTD sensor simulator. Check the performance of the overtemperature protection by simulating different temperature vatues. Check the alarm and trip level. UNDERCURRENT TRIP condition to one of the other output relays. Disable all other protection functions. For testing the undercurrent protection a single-phase test case is sufficient. Checking the undercurrent protection for motors When the motor status is 'STOPPED' or 'START' the undercurrent protection is inactive. Inject a current higher than 1.I25A to change the motor status from 'STOPPED' to 'START'. Now lower the current to 1.OO A. The motor status will change to 'RUNNING' and the bypass timer will start. After 5 s the undercurrent protection will be active. Check the performance of the undercurrent protection by injecting different current values. Check the pick-up level and the delay time. Do not lower the current under 0.1 00 A, as the motor status will change to 'STOPPED' then. Marshall the UNDERCURRENT ALARM condition to one of the output relays. Marshall the Checking the undercurrent protection for nonrotating objects Change the device type to NON-ROTATING. After changing the operating mode to ON LINE the relay will pick-up. After injection of a current higher than 0.500 A the pick-up condition will vanish and the LED indicators can be reset. G88700-C3527-07-7600 one hundred sixty-three and 001100 MFR 7SJ551 Operating instructions Check the performance of the undercurrent protection by injecting different current values. 1 Check the pick-up level and the delay time. Testing the low set overcurrent protection 6.16.12 I Parametrize the relay according to the following settings. Parameter CHANNELS L1 L2 L3 1" e ,I 6.16.12.1 Setting ENABLED ENABLED ENABLED 1 ENABLED 1 Marshall the LOW SET OVERCURRENT START L> condition to (m e of the output relays. Marshall the LOW SET 01VERCURRENT TRlP L> condition to a second outpiut relay. Marshall the LOW SET OVERCURFlENT START e> condition to a third output relay. Marshall the LOW SET OVERCURFIENT TRlP e> condition to a fourth output relay. Disable all other protection functions. For testing ttl e low set overcurrent protection a single-phase! test case is sufficient. Testing the definite time overcurrent protection Parametrize the low set overcurrent protection according to the following settings. Parameter PROTECTIONS LOW SET OVERCURRENT PHASE CHARACTERlSTiC I> tl> EARTH CHARACTERISTIC 1 2 tl2 Setting ENABLED DEFINITE 1.50 . I, 5.00 s ENABLED DEFINITE ,500 ,,I 5.00 s For test currents below 6 x ,1 (4 x I, for sensitive earth current input) , slowly increase the test current over one phase and earth until the protection picks up. For test currents above 6 x I, (4 x I, for sensitive earth current input) measurement shall be performed dynamically. Inject a test current of 1.OO x I, via one phase and the earth path. Check if the START e> output picks up and if the TRlP e> output closes after expiry of the delay time. Inject a test current of 2.00 x I, via one phase and the earth path. Check if the START L> 1 one hundred sixty-four and 00/100 G88700-C3527-07-7600 Operating instructions MFR 7SJ551 @ output picks up and if the TRlP b output closes after expiry of the delay time. Reset occurs at approximately 95% of the pick-up value. 6.16.1 2.2 Be aware that the parametrized times are pure delay times; operating times of the measurement functions are not included. Testing the inverse time overcurrent protection Parametrize the low set overcurrent protection according to the following settings. Parameter PHASE CHARACTERISTIC IP ,t EARTH CHARACTERISTIC lep teo Setting ENABLED NORMAL INVERSE 1.50 . I, 1.oo ENABLED NORMAL INVERSE .500 . Ien 1.OO For test currents below 6 x ,1 (4 x I, for sensitive earth current input) , slowly increase the test current over one phase and earth until the 6.16.12.3 1 protection picks up. For test currents above 6 x I, (4 x I, for sensitive earth current input) measurement shall be performed dynamically. lnject a test current of 1.OO x I, via one phase and the earth path. Check if the START e> output picks up and if the TRlP e> output closes after expiry of a delay time of 10.0 s. The expected delay times can be calculated from the formula given in the technical data. lnject a test current of 2.00 x I, via one phase and the earth path. Check if the START L> output picks up and if the TRlP L> output closes after expiry of a delay time of 10.0 s. Testing the custom curve overcurrent protection I Parametrize the [ow set overcurrent protection according to the following settings. Parameter PHASE CHARACTERISTIC # OF POINTS 11 t 11 I 115 t11s EARTH CHARACTERISTIC It31 tlel I IBIS Setting ENABLED CUSTOM 15 1.50 . In 100 s I 6.00 . In SO0 s ENABLED CUSTOM 0.50 . Ien 100 s I 6.00 . Ien Choose convenient current-time points for the phase and earth custom curves. For test currents below 6 x I, (4 x I, for sensitive earth current input) , slowly increase the test current over one phase and earth until the protection picks up. For test currents above 6 x I, (4 x I, for sensitive earth current input) measurement shall be performed dynamically. Inject different test currents via one phase and the earth path. Check if the START e> output picks up and if the TRlP e> output closes after expiry of the corresponding delay times. Check if the START L> output picks up and if the TRlP L> output closes after expiry of the corresponding delay times. I G88700-C3527-07-7600 one hundred sixty-five and 001100 Operating instructions MFR7SJ551 6.1 6.13 Parametrize the relay according to the following settings. Parameter CHANNELS L1 L2 Ien PROTECTIONS HlGH SET OVERCURRENT PHASE ENABLED L3 1, e I>> 2.00 .500s tl>> EARTH 12> ENABLED 1 .oo .,,I 2.50 s Marshall the HlGH SET OVERCURRENT START L>> condition to one of the output relays. Marshall the HIGHHSET OVERCURRENT TRlP L>> condition to a second output relay. Marshall the HlGH SET OVERCURRENT START e>> condition to a third output relay. Marshall the HlGH SET OVERCURRENT TRlP e>> condition to a fourth For test currents below 6 x ,1 (4 x I, for sensitive earth current input) , slowly increase the test current over one phase and earth until the protection picks up. For test currents above 6 x I, (4 x I, for sensitive earth current input) measurement shall be performed dynamically. Inject a test current of 1.50x ,I via one phase and the earth path. Check if the START e> output picks up and if the TRlP e> output closes after expiry of the delay time. Inject a test current of 3.00x I, via one phase and the earth path. Check if the START L> output picks up and if the TRlP L> output closes after expiry of the delay time. Reset occurs at approximately 950h of the pick-up value. Be aware that the parametrized times are pure delay times; operating times of the measurement functions are not included. Testing the unbalance protection Parametrize the relay according to the following settings. best results are achieved with a three-phase test case. Parameter DEVICE DATA Iflc DEVICE TYPE Checking the unbalance protection for motors Inject a current higher than 1.I25 A to change the motor status from 'STOPPED' to 'START1.The bypass timer starts. Now lower the current to 1.OOA. The motor status will change to 'RUNNING'. During the bypass time the unbalance protection is inactive. Af-ter 5 s the unbalance protection will be active. 11-10load CHANNELS L1 L2 L3 ,1 PROTECTIONS UNBALANCE fbypass 12 Setting 1 .oo. I, ROTATlNG 0.1 A ENABLED ENABLED ENABLED 1 ENABLED 1.oo s .200 .200 Marshall the UNBALANCE ALARM condition to one of the output relays. Marshall the UNBALANCE TRlP condition to one of the other output relays. Disable all other protection functions. For testing the unbalance protection a single-phase test case is sufficient, but 1 output relay. Disable all other protection functions. For testing the high set overcurrent protection a single-phase test case is sufficient. Setting ENABLED ENABLED ENABLED 1 ENABLED 1 6.1 6.1 4 * Testing the high set overcurrent protection one hundred sixty-six and 0011 00 'I Check the performance of the unbalance protection by injecting different asymmetric currents. Check the pick-up level. Do not lower the current under 0.100 A, as the motor status will change to 'STOPPED' then. Be aware that the unbalance protection function calculates the delay time out of absolute values and not out of relative values. Example 1 lap= 0.2x I,. The injected current is I .OO x I,. The function picks up with 20% asymmetry. G88700-C3527-07-7600 0 ? ~ MFR 7SJ551 Operating instructions Example 2 Izp= 0.2 x I,. The injected current is 2.00 x In. The function picks up with 10% asymmetry. A convenient test is injecting 1.00 A in one phase. The unbalance current will be 0.33 A then, which leads to a trip delay time (extremely inverse) of 9.0 s. phase current instead of with Izp.Check this pick-up behaviour. Checking the unbalance protection for non-rotating objects Change the device type to NON-ROTATING.The bypass time and the motor status dependent behaviour do not apply. All further tests and examples are valid. If the motor status is 'START' the unbalance protection picks up with one third of the largest 6.16.15 Testing the Pocked rotor protection Parametrize the relay according to the following settings. Parameter DEVICE DATA Iilc DEVICE TYPE !no load Istart CHANNELS L1 L2 L3 1" PROTECTIONS LOCKED ROTOR 4r G88700-C3527-07-7600 Setting 1.oo . I" ROTATING 0.1 A 4.00 . I, ENABLED ENABLED ENABLED 1 Marshall the LOCKED ROTOR condition to one of the output relays. Disable all other protection functions. For testing the locked rotor protection a single-phase test case is sufficient. The locked rotor protection is only active for motor status 'START'. Check the performance of the locked rotor protection by injecting different current values higher than 1.1 25 A. Check the delay times. A convenient injecting current is the start current of 4.00 A. The locked rotor protection should trip in the locked rotor time of 5.00 s then. ENABLED 5.00 s one hundred sixty-seven and 00/100 MFR 7SJ551 6.1 6.16 Operating instructions Testing the zero speed protection Parametrize the relay according to the following settings. Parameter DEVICE DATA Iflc DEVICE TYPE lno load halt CHANNELS L1 L2 L3 In PROTECTIONS ZERO SPEED 6.16.6 7 Setting 1.oo . I, ROTATING 0.1 A 4.00 - 1, ENABLED ENABLED ENABLED I ENABLED Parameter CHANNELS L1 L2 e len U,n un PROTECTIONS LOW SET OVERCURRENT EARTH CHARACTERISTIC I? ti+ DIRECTIONAL EARTHFAULT CONTROL turn Id > ' +I @e 81 s, 83 110.0 s Marshall the ZERO SPEED ALARM condition to one of the output relays. Marshall the ZERO SPEED TRIP condition to one of the other output relays. Marshall the ZERO SPEED function to one of the binary inputs. Disable all other protection functions. For testing the ZERO SPEED protection a singlephase test case is sufficient. 1 The ZERO SPEED protection is only active for motor status 'START'. Check the performance of the ZERO SPEED protection by injecting a current value of 4.00 A. Energizing the binary zero speed input will cause the zero speed function to pick up. If the binary input stays energized for 10.0 s the zero speed function will trip. Check this behaviour. Testing the directional earth fault protection Parametrize the relay according to the following settings. Ustn 1 ZERO Setting ENABLED ENABLED ENABLED I ENABLED I00 v ENABLED DEFINITE .500 . Ien 5.00 s ENABLED COSINE 0.1 . U, 8.5 s FORWARD FORWARD 0" 0" 0" 0" Marshall the LOW SET OVERCURRENT START $> condition to one of the output relays. Marshall the LOW SET OVERCURRENT TRIP $> condition to a second output relay. Marshall the HIGH SET OVERCURRENT START I$>> condition to a third one hundred sixty-eight and 00/100 output relay. Marshall the HIGH SET OVERCURRENT TRIP $>> condition to a fourth output relay. Marshall the EARTH CURRENT DIRECTION FORWARD condition to a fifth output relay. Marshall the EARTH CURRENT DIRECTION BACKWARD condition to a sixth output relay. Disable all other protection functions. For testing the directional earth fault protection a single-phase test case is sufficient. The directionai earth fault protection is tested in a similar way as the low set earth overcurrent time protection (section 6.16.12). But the following must be observed. The test current is injected on the sensitive earth current input. Otherwise this function cannot operate. This input is specially designed for highly sensitive measurement. Thus, restricted threshold values up to 1.4 A are available only. The voltage which is needed for directional determination is applied to the voltage input (open delta voltage). For directional determination the direction indicator outputs can be useful. For any voltage and earth current one of these two outputs will close, indicating the forward or backward direction. Be aware that these direction indicator outputs are not the alarm or trip output! Testing of the earth fault protection for non-earthed networks is not completely possible with conventional test sets, since the simulation of an G88700-C3527-07-7600 MFR 7SJ551 ! Operating instructions earth fault requires a complete displacement of the voltage triangle. The correct relationship and polarity of the measuring transformer connections, essential 6.16.18 for proper earth fault detection, can only be tested when primary load current is available during commissioning. Testing the undervoBtage protection Parametrize the relay according to the following settings. Parameter CHANNELS Setting Ll un ENABLED ENABLED ENABLED 10ov UNDERVOLTAGE U< t U< ENABLED 250 . U, 5.00 s L2 U,n PROTECTIONS 6.16.1 9 Marshall the UNDERVOLTAGE ALARM condition to one of the output relays. Marshall the UNDERVOLTAGE TRlP condition to one of the other output relays. Disable all other protection functions. For testing the undervoltage protection a single-phase test case is sufficient. After changing the operating mode to ON LINE the relay will pick-up. After applying a voltage higher than 25.0 V the pick-up condition will vanish and the LED indicators can be reset. Check the performance of the undervoltage protection by applying different voltage values. Check the pick-up level and the delay time. Testing the overvoltage protection Parametrize the relay according to the following settings. Parameter Setting CHANNELS L1 L2 U,n U" ENABLED ENABLED ENABLED I00 v Marshall the OVERVOLTAGE ALARM U> condition to one of the output relays. Marshall the OVERVOLTAGE TRlP U> condition to a second output relay. Marshall the OVERVOLTAGE ALARM U>> condition to a third output relay. Marshall the OVERVOLTAGE TRlP U>> condition to a fourth output relay. Disable all other protection functions. For testing the overvoltage protection a single-phase test case is sufficient. PROTECTIONS OVERVOLTAGE U> t U> u>> t U>> G88700-C3527-07-7600 ENABLED .750 . U, 5.00 s 1.oo . U, 1.oo s Check the performance of the overvoltage protection by applying different voltage values. Check the pickup levels and the delay times. one hundred sixty-nine and 001100 1 l MFR 7SJ551 6.1 6.20 Operating instructions Testing the breaker failure protection Parametrize the relay according to the following settings. Parameter CHANNELS L1 L2 L3 In PROTECTlONS LOW SET OVERCURRENT PHASE CHARACTERISTIC I> tl> BREAKER FAILURE PROTECTION EXTERN Ibf tbf Setting ENABLED ENABLED ENABLED I ENABLED DEFINITE 1.so . In 5.00 s ENABLED DISABLED .500 . In 10.0 S BREAKER FAILURE PROTECTION condition to one of the other output relays. Disable all other protection functions. For testing the breaker failure protection a single-phase test case is sufficient. Checking the internal mode lnject a current of 2.00 A. The low set overcurrent protection will pick up. After 5.00 s the low set overcurrent protection trips. Make sure, however, that the current stays higher than 0.500 A. Check whether the breaker failure protection output closes after 10.0 s. Checking the external mode Marshall the breaker failure protection function to one of the binary inputs. Enable the external mode of the breaker failure protection function. . . lnject a current of 1.OO A. Energize the breaker failure protection input. Check if the breaker failure protection output closes after 10.0 s. Marshall the LOW SET OVERCURRENT TRlP condition to one of the output relays. Marshall the 6.16.21 Testing the curve switch Parametrize the relay according to the following settings. Parameter DEVICE DATA lflc DEVICE TYPE lno load CHANNELS L1 L2 L3 In PROTECTIONS CURVE SWITCH LOW SET OVERCURRENT PHASE CURVE 1 CHARACTERISTIC 1>1 tl>, CURVE 2 CHARACTERISTIC 1>2 tI>* Setting LOW SET OVERCURRENT TRIP b condition to a second output relay. Disable all other protection functions. For testing the curve switch a singlephase test case is sufficient. 1.oo . In ROTATING 0.1 A Checking the continuous mode Parametrize the curve switch function according to the following settings. ENABLED ENABLED ENABLED 1 Parameter CURVE SWITCH MODE ENABLED ENABLED DEFINITE 1.50 . I, 5.00 s DEFINITE 3.00 . In 0.50 s Marshall the LOW SET OVERCURRENT START L> condition to one of the output relays. Marshall the one hundred seventy and 001100 Setting ENABLED CONTINUOUS Marshall the curve switch function to one of the binary inputs. lnject a test current of 2.00 x I, via one phase lead. Check if the START L> output picks up and if the TRlP L> output closes after expiry of the delay time of 5.00 s. Energize the binary curve switch input. lnject a test current of 2.00 x ,1 via one phase lead. Check if the relay stays in rest. lnject a test current of 4.00 x I, via one phase lead. Check if the START L> output picks up and if the a i G88700-C3527-07-7600 MFR 7SJ551 Operating instructions TRIP b output closes after expiry of the delay time of 0.500 s. Checking the pulse mode Parametrize the curve switch function according to the following settings. Parameter CURVE SWITCH MODE tcs Setting ENABLED PULSE 10.0 s Marshall the curve switch function to one of the binary inputs. 8 ! Inject a test current of 2.00 x I, via one phase lead. Check if the START L> output picks up and if the TRIP b output closes after expiry of the delay time of 5.00 s. Energize the binary curve switch input just before injecting a test current of 2.00 x I, via one phase lead. Check if the relay stays in rest during 10.0 seconds after energizing the binary input. Thus a transformer or motor inrush is simulated. Repeat this test with a current of 4.00 A. Check if the relay trips after 0.500 s. G88700-C3527-07-7600 Checking the status mode Parametrize the curve switch function according to the following settings. Parameter CURVE SWITCH STATUS Settin ENABLED STATUS STPISTRT Curve 2 will be active when the motor status is 'ST0 PPED' or 'START'. Move to the menu part MEASURED VALUES (ON LINE) and select the menu part MOTOR STATUS on the display. Check if the motor status is 'STOPPED'. Inject a test current of 2.00 A via one phase lead. The motor status will change to 'START'. Check if the relay stays in rest. Lower the current to 1.OO A. The motor status will change to 'RUNNING'. Curve 1 will be active from now on. Raise the current to 2.00 A again. Check if the START L> output picks up and if the TRIP b output closes after expiry of the delay time of 5.00 s. one hundred seventy-one and 001100 MFR 7SJ551 6.16.22 Operating instructions Parametrize the relay according to the following settings. Parameter DEVICE DATA DEVICE TYPE CHANNELS L1 L2 L3 In Uin Un PROTECTIONS UNDERCURRENT I< t I< UNDERVOLTAGE U< t U< BLOCK BLOCK I< BLOCK U< Setting NON-ROTATING ENABLED ENABLED ENABLED I ENABLED I00 V ENABLED .500 3.00s ENABLED -250. U, 5.00 s ENABLED ENABLED ENABLED As a test example here the block function will be applied to the undercurrent and undervoltage protection stages. Marshall the UNDERCURRENT TRIP condition to one of the output relays. Marshall the UNDERVOLTAGE TRIP condition to a second output relay. Disable all other protection functions. For testing the block function a single-phase test case is sufficient. This test shows how the block function can be used to overcome the initial voltage- and currentless condition of a transformer or motor. Checking ihe continuous mode Parametrize the block function according to the following settings. -- Parameter BLOCK MODE Setting ENABLED CONTINUOUS Marshall the block function to one of the binary inputs. 6.16.23 a Testing the block function i After changing the operating mode to ON LINE the relay will pick-up. After applying a voltage higher than 25.0 V and a current higher than 0.500 A the pick-up condition will vanish and the LED indicators can be reset. lnject a test current of 1.OO x 1, via one phase lead and apply a voltage of 100 V. Check if the relay picks up when the current or the voltage is taken away. lnject a test current of 1.OOx Invia one phase lead and apply a voltage of 100 V. Energize the binary block input. Check if the relay stays .in rest when the current or the voltage is taken away. Checking the pulse mode Parametrize the block function according to the following settings. Parameter BLOCK MODE BLOCK Setting ENABLED PULSE 10.0s Marshall the block function to one of the binary inputs. After changing the operating mode to ON LINE the relay will pick-up. After applying a voltage higher than 25.0V and a current higher than 0.500A the pick-up condition will vanish and the LED indicators can be reset. lnject a test current of 1.OOx I, via one phase lead and apply a voltage of 100 V. Check if the relay picks up when the current or the voltage is taken away. lnject a test current of 1.OOx Invia one phase lead and apply a voltage of 100 V. Energize the binary curve switch input just before taking away the current or the voltage. Check if the relay stays in rest during 10.0 seconds after energizing the binary input. Checking the status mode The block status mode can be tested similar to the curve switch status mode. It is applicable only to rotating devices. Refer to 6.16.21. Testing the external command Parametrize the relay according to the following settings. one hundred seventy-two and 0011 00 G88700-C3527-07-7600 t MFR 7SJ551 Parameter CHANNELS L1 L2 PROTECTIONS EXTERNAL COMMAND t ~ ~ r 6.16.24 Operating instructions Setting ENABLED ENABLED ENABLED 5.00 s Marshall the EXTERNAL COMMAND function to one of the binary inputs. Marshall the EXTERNAL COMMAND condition to one of the output relays. Disable all other protection functions. For testing the external command a test case is not necessary. Energize the binary external command input. Check if the external command output closes after 5.00 s. Testing the circuit breaker position Parametrize the relay according to the following settings. Parameter CHANNELS Settin ENABLED ENABLED I PROTECTIONS CB POSITION G88700-C3527-07-7600 ENABLED Marshall the CIRCUIT BREAKER POSITION function to one of the binary inputs. Marshall the EXTERNAL COMMAND condition to one of the LED indicators. Disable all other protection functions. For testing the circuit breaker position a test case is not necessary. Energize the binary circuit breaker position input. Check if the circuit breaker position LED indicator lights up. one hundred seventy-three and 001100 MFR 7SJ551 6.17 Cammissioning using primary tests All secondary testing sets and equipment must be removed. Reconnect current transformers. For testing with primary values the protected object must be energized. /;\ Warning Primary tests shall be performed only by qualified personnel which is trained in commissioning of protection systems and familiar with the operation of the protected object as well as the rules and regulations (switching, earthing, etc.) 6.17.1 Operating instructions Current circuit checks Connections to current transformers are checked with primary values. For this purpose a load current of at least 10% of the rated current is necessary. Currents can be read off on the display in the front or via the serial interface and compared with the actual measured values. If substantial deviations occur, then the current transformer connections are incorrect. /r\ DANGER! Secondary connections of the current transformers must be short-circuited before any current ieads to the relay are interrupted! No further tests are required for overcurrent time protection; these functions have been tested under section 6.16.1 1. For checking the trip circuits at least one circuit breaker live trip should be performed (refer to section 6.17.4). one hundred seventy-four and 00/100 6.1 7.2 Checking the reverse interlock scheme (id used) For use and tests of the reverse interlock scheme it is necessary that one of the binary inputs has been assigned to-the block function. Set the block function to continuous mode and enable BLOCK I>>. Binary inputs can be programmed 'normally open' or 'normallv closed'. The followina ~rocedureis valid forth; 'normally open mod2 as preset by the factory. The protection relay on the incoming feeder and those on all outgoing circuits must be in operation. At first the auxiliary voltage for reverse interlocking should not be switched on. Apply a test current which leads to pick-up of the I>> stage as well as the I> or I, stage. Because of the absence of the blocking signal the relay trips after the short delay time tl>>. A Caution For the normal current circuits, test currents larger than 6 times I, may overload and damage the relay current input channels if applied continuously. Observe a cooling period if necessary. Now switch on the DC voltage for the reverse interlocking. The test as described above is repeated, with the same result. Simulate a pick-up on each protective device on all outgoing feeders. Simultaneously, a short-circuit is simulated on the incoming feeder (as described before). Tripping now occurs after the delayed time tl> or according tot, (calculated delay time). If applicable repeat test for the earth current stages. Simultaneously these tests prove that the wiring between the protection relays is correct. G88700-C3527-07-7600 - ~ Operating instructions MFR 7SJ551 ! 6.17.3 Testing the switching of binary inputs and outputs Caution As soon as the test mode is activated the relays stops protecting the network component. The relay contains a test routine with which the binary inputs and outputs can be checked. This test mode can only be entered in ON LlNE mode. The test mode can be reached in the ON LlNE main menu. A R E YOU S U R E After typing backspace the green ON LlNE LED indicator goes out to indicate there is no protection. 1 ENTER TES~MODE? BACKSPACE 1- 1-+- + Choose the 110 test mode. OUTPUTS Checking the output relays A R E YOU SURE 1l:YP; BACKSPACE 1 +I[ [TOGGLE OUTPUT Type BACKSPACE. Check if output 1 closes. By repeating above procedure output 1 can be opened again. Follow this procedure for all available output relays. Checking the binary inputs Energize input 1. Check if the indication 'OFF' changes to 'ON'. Release input 1. Check if the indication 'ON' changes to 'OFF'. Follow this procedure for all available binary inputs. G88700-C3527-07-7600 one hundred seventy-five and 00/100 " i Operating instructions MFR 7SJ551 Leaving the test mode ARE Y O U S U R E TESTMODE ? After the I10 test it is important to leave the test mode. After typing backspace the relay is back in the main menu of the protective ON LlNE mode. BACKSPACE 6.1 7.4 Tripping test including circuit breaker MFR 7SJ551 allows simple checking of the tripping circuit and the circuit breaker. For this, the circuit breaker can be tripped by initiation from the operator keyboard. For this purpose the ON LlNE TEST function is used. Refer to section 6.17.3 for a description of how to close and open the trip command output. Activate the CIRCUIT BREAKER POSITION indication to scan the operation of the breaker and the success of the procedure on a LED indicator. 6.17.5 Putting the relay into operation All setting values should be checked again, in case they were altered during the tests. Particularly check if all desired protection and ancillary functions have been enabled. I Stored indications on the front plate should be reset by pressing the RI key on the front so that from then on only real faults are indicated. Check if the module is properly inserted and fixed. All terminal screws - even those not in use - must be tightened. If a test switch is available this must be set in the operating position. Put the relay in ON LlNE mode. The green ON LlNE LED indicator must light up. The red MONITOR LED indicator has to be dark. MFR 7SJ551 is ready for operation now. one hundred seventy-six and 0011 00 G88700-C3527-07-7600 R MFR 7SJ551 Maintenance and trouble shooting Maintenance and trouble shooting 7 j 7.11 F o r the normal current circuits, test currents larger than 6 times ,I and for the ,I sensitive current circuit, test currents larger than 4 times I, may overload and damage the relay current input channels if applied continuously. Observe a cooling period if necessary. General Siemens digital protection relays are designed to require no special maintenance. All measurement and signal processing circuits are fully solid state and therefore completely maintenance-free. Input modules are static, relays are hermetically sealed or provided with protective covers. - Only the internal real time clock module which has an integrated battery back-up device may have to be serviced after approximately 10 years after manufacturing of the relay. We recommend to replace the real time clock module in accordance with your maintenance philosophy. Don't forget to restore the settings to the original ones, and to check the status of the current terminais. 7.2 Routine checks The planned maintenance intervals for checking and maintenance can be used to perform operational testing of the protection equipment. This maintenance serves mainly for checking the interfaces of the unit, i.e. the coupling with the plant. The following procedure is recommended: - Read-out of the operational values and comparison with the actual values for checking the analogue interfaces. - Simulation of an internal short-circuit with 4 x I, for checking the analogue input at high currents. /;\ Warning Hazardous voltages can be present on all the electrical circuits and components connected with the supply voltage or with the measuring and test test voltages/currents! Non-observance of the safety rules can result in personal injury or property damage. A Caution Circuit-breaker trip circuits are tested by actual live tripping. The overcurrent function can be tested by secondary injection of a current (see section 6.1 6.12). 7.3 Self-test One of the benefits of a microprocessor system is the self-testing of the system. When a malfunction is located, MFR 7SJ551 will record the cause, if possible. The malfunction cause is displayed in the manufacturing data menu (see section 6.1 4.7). The 'NO ERRORS' message will appear if MFR 7SJ551 has no failure messages. An error message will appear if MFR 7SJ551 has located an internal failure. The meaning of the different error messages is: HW: AUX. SUPPLY The auxiliary supply voltage was below the allowed value for a certain time. Normal operation will still be possible HW: EZPROM The EEPROM memory contains the default values and the setting values. The test is carried out by adding the data in the EEPROM and comparing the sum values with fixed values. Contact the Siemens service department if MFR 7SJ551 has this failure. HW: RAM The RAM memory contains the actual values. The test is carried out by write and read cycles in order to verify that each bit in every location can be modified under program control. Switch off the auxiliary supply voltage and switch it on again after a few seconds. Contact the Siemens service department if the failure remains. Instead of switching off the auxiliary supply voltage you can also reset the microcontroller with a fine pin on the front panel. 1 Maintenance and trouble shooting MFR 7SJ551 HW: REF. VOLTAGE The internal reference voltage is used for a correct reading of all the analogue signals. A failure of the internal reference voltage will cause incorrect values in the system. Contact the Siemens service department if MFR 7SJ5.51 has this failure. ! I , HW: ROM The ROM memory contains the control program and fixed data, which should not be changed. The test is carried out by adding the data in the ROM and comparing the sum values with fixed values. Switch off the auxiliary supply voltage and switch it on again after a few seconds. Contact the Siemens service department if the failure remains. lnstead of switching off the auxiliary supply voltage you can also reset the microcontroller with a fine pin on the front panel. Recommended RTC chip: Manufacturer: DALLAS Order number: DS 1286 This chip is mounted on the processor board and is replaceable by anyone who is familiar with the handling of electronic components. For replacing the RTC chip the relay unit has to be removed from its metal housing. The RTC chip is located at the underside of the relay to the backside next to the EPROMS (see figure 7.1. Replacement procedure: - Prepare area of work; provide conductive surface for the basic module. HW: TRIP COIL A disconnection is observed in the circuit to output relay number 1. Probably a trip command activation of MFR 7SJ551 will not close the contacts of output relay 1. Contact the Siemens service department if MFR 7SJ551 has this failure. SW: MLFB There is a specific failure in the EEPROM which has occurred between the last check of the EEPROM and the check of the order number of the 7SJ551 relay. Contact the Siemens service department if MFR 7SJ551 has this failure. SW: SW ERROR There is an unexpected failure situation. Switch off the auxiliary supply voltage and switch it on again after a few seconds. Contact the Siemens service department if the failure remains. lnstead of switching off the auxiliary supply voltage you can also reset the microcontroller with a fine pin on the front panel. If the real time clock (battery performance) is not working properly, the ON LlNE LED indicator will start to flash. Only storing of statistical data will be affected. The relay will perform all other functions well. 7.4 Replacing the real time clock module MFR 7SJ551 is equipped with a real time clock module which should last for approximately 10 years. After this time the RTC chip must be replaced. Malfunction of the real time clock is indicated by a flashing ON LlNE LED indicator. - Open front cover. - Note down all the settings (or check them with the already filled-in form) or save them on hard disk using the '7SJ551 Communication Utility' software program. - Prepare the RTC chip, do not place it on the conductive surface. A Caution Do not short-circuit the RTC chip! Do not reverse the RTC chip polarities! Do not charge the RTC chip! - Put the device in OFF LlNE mode. - Switch of the device, and wait till the red monitor LED has completely gone out. - Unscrew, in the correct order, both screws on the 7SJ551 relay. Warning Hazardous voltages can be present on all the electrical circuits and components connected with the supply voltage or with the measuring and test voltages/currents! Non-observance of the safety rules can result in personal injury or property damage. I Maintenance and trouble shooting MFR 7SJ551 - Pull out the 7SJ551 basic module of the housing with the handle, whilst supporting it on the bottom-side. /!\Caution Electrostatic discharges via the component connections, the PCB tracks or the connecting pins of the modules must be avoided under all circumstances by previously touching an earthed surface and by connecting via an bracelet to a highohmic discharge cord to earth. - Place the 7SJ551 module on the conductive surface. - Remove the RTC chip with a pair of tweezers, do not place it on the conductive surface. - Insert the new RTC chip with a pair of tweezers in the correct way. Firmly push in the 7SJ551 module in its housing, whilst supporting it on the bottom side. - Fasten the two screws in the correct order,. - Switch on the device. - Switch off the supply voltage to zero. The red LED indicator MONITOR will go out. - Return the supply voltage to its normal operating level. Verify that the 7SJ551 relay resumes its normal ON LlNE operation. - Check the power fail memory circuit by verifying that set points and statistical data have not been altered. 9.6 Trouble shooting When MFR 7SJ551 seems to have a defect, various checks can be made by the user himself. In case none of the LED indicators lights up when turning on the mains supply, the following checks can be performed: - Is the relay unit properly inserted in the metal case, are both screws fastened? - Is the auxiliary supply connected to the correct input position (XC-IV-1 and XC-IV-2)? - Is the connected auxiliary supply in accordance with the 7SJ551 supply range? Check the sticker at the top of the metal case. - Check if all settings are OK. - Set the day and time as described in section 6.10. - Place front cover 7.5 Power failure test The 7SJ551 relay has an internal power fail detection circuit. To test this circuit, the following steps have to be made: - Make sure the 7SJ551 relay operates in the ON LlNE mode and start with decreasing the supply voltage. - When the supply voltage drops below its specified operating range, MFR 7SJ.551 ceases to operate. The relay has insufficient voltage to continue to monitor the protected device accurately. The green LED indicator ON LlNE will go out and the red LED indicator MONITOR will light up. All output relays will be in the power-off state. - Is the mini-fuse in the power supply section intact? If not, replace the fuse in accordance with section 7.6.1. When the red MONITOR LED indicator lights up the internal memory might contain incorrect data. Press the RES PC button with a small object. MFR 7SJ551 will initialize its memory, and this can lead to proper performance. When MFR 7SJ5.51 seems to work properly (e.g. the green ON LlNE LED indicator lights up), but does not respond to the keyboard functions, one of the keys may be jammed by the metal front during transportation or installation. Check all keys by pressing them individually, and try to move the metal front gently. 7.6.1 Replacing t h e mini-fuse For replacing the mini-fuse the relay unit has to be removed from its metal housing. The fuse screw holder is located at the backside of the basis unit. 1 Maintenance and trouble shooting MFR7SJ551 Replacement procedure: - Select a replacement fuse. For an auxiliary voltage of DC 24 60 V we recommend a 5 x 2 0 mm glass fuse, 1.6A, slow. For an auxiliary voltageof DC 1 1 0 - 2 5 0 V / A C 1 1 0 - 2 3 0 V w e recommend a 5 x 20 mm glass fuse, 0.5 A, slow. - - Prepare area of work; provide conductive surface for the basic module. Open front cover. Put the relay in OFF LINE mode. - Switch of the device and wait till the red MONITOR LED is completely off. /;\ Warning Hazardous voltages can be present on all the electrical circuits and components connected with the supply voltage or with the measuring and test voltages/currents! Non-observance of the safety rules can result in personal injury or property damage. - Pull out the 7SJ551 basic module of the housing with the handle, whilst supporting it on the bottom-side. A Caution Electrostatic discharges via the component connections, the PCB tracks or the connecting pins of the modules must be avoided under all circumstances by previously touching an earthed surface and by connecting via an bracelet to a highohmic discharge cord to earth. Figure 7.1 Replacing the mini-fuse - Place the 7SJ551 module on the conductive surface. - Remove blown fuse from the screw holder at the middle in the back of the device (see figure 7.1). - Fit new fuse into the holder. - Firmly push in the 7SJ551 module in its housing, whilst supporting it on the bottom-side. - Fasten the two screws in the correct order. Switch on the device again. If a power supply failure is still signalled, a fault or short-circuit is present in the internal power supply. The device should be returned to the Siemens service department. MFR 7SJ551 naarnhoofdstuk Repairs Self-repair of defective modules is not recommended, because specially selected electronic components are used which must be handled in accordance with the procedures required for electrostatically endangered components (EEC). Furthermore, special manufacturing techniques are necessary for any work on the printed circuit boards in order to prevent damage of the bath-soldered multi-layer boards, the sensitive components and the protective finish. Therefore, if a defect cannot be corrected by operator procedure as described in Chapter 7, it is recommended that the complete relay is returned to the manufacturer. It is unavoidable to replace individual modules, it is imperative that the standards related to the handling of electrostatically endangered components are observed. // Warning Hazardous voltages can be present on all the electrical circuits and components connected with the supply voltage or with the measuring and test voltages/currents! Non-observanceof the safety rules can result in personal injury or property damage. /;\ Caution Electrostatic discharges via the component connections, the PCB tracks or the connecting pins of the modules must be avoided under all circumstances by previously touching an earthed surface and by connecting via an bracelet to a highohmic discharge cord to earth. Components and modules are not endangered as long as they are installed within the relay. Should it become necessary to exchange any device or module, the complete parameter assignment should be repeated. It is convenient to save all parameters on hard disk or diskette using the '7SJ551 Communication Utility' software program. These can be transmitted into the replacing relay. We urgently advise to use a transport housinq for 7SJ55 relays that are sent back for repair. Otherwise mechanical damages can occur. A transport housing (order number G88700-C3526L153) is deliverable by Siemens Netherlands: The form 'advice of return 7SJ55' (Appendix E) can be sent together with the defective relay. Siemens Nederland N.V. Industrial Centre Zoetermeer Department PI PROD EPS (Room B3.0.17) Werner von Siemensstraat 1 NL-2712 PN ZOETERMEER The Netherlands. Send or fax this form also to the purchase department EV TD in The Hague, so that the repair process can be prepared before the relay arrives: Siemens Mederland N.V. Department EV TD P.O. Box 16068 NL-2500 BB THE HAGUE The Netherlands 31 70 333 3225 fax number telephone number 31 70 333 3134 In this manner repair times can be minimized. Be sure to fill in: sender data your order number * MLFB code * serial number firmware version error description desired action 0 return address MFR 7SJ551 9 Repairs Storage Solid state protective relays shall be stored in dry and clean rooms. The temperature range for storage of the relays or associated spare parts is 25 "C to +55 "C or -12 "F to 130 "F. - The relative humidity must be within limits to avoid condensation or ice forming. After extended storage it is recommended that the relay is connected to its auxiliary voltage source for one or two days prior to taking it into actual service. This serves to regenerate the electrolytic capacitors of the auxiliary supply. In extreme climatic conditions (tropics) pre-warming will thus be achieved and condensation avoided. " MFR 7SJ551 B 1 c Typical wiring diagrams Motor application example D Default values F Advice of return 7S455 I Appendix MFR 7SJ551 A Appendix General diagrams XC-IV MONITOR XE-IV XD-IV XE-Ill XC-IV 'd XB-II XD-Ill XE-I I OUTPUT XD-I1 OUTPUT XE-I XD-1 OUTPUT OUTPUT 8 XB-I I1 XB-IV xB-lv ------- 1 -,-,- I I Interface I I I Temperature sensor I I I I I I I I RxD Gnd I 1 1 I 1 I I I I RxD I I I ; , , , , , Figure A.l G e n e r a l diagram for 7SJ551*-**A*O-g I , , , 1,, 1 I MFR7SJ551 Appendix XC-IV XC-IV MONITOR OUTPUT 1 XE-Ill /A XD-Ill XE-II OUTPUT 2 XD-ll XE-I OUTPUT 3 XD-l OUTPUT 4 XC-Ill XB-1 4 f XB-Ill XB-IV XB-V OUTPUT 5 XC-I OUTPUT 6 XC-I INPUT 3 Temperature sensor (8~) XB-I INPUT 4 TxD Gnd RxD G nd XB-l l TxD RxD Figure A.2 - General diagram for 7SJ551*-**A*O-I* MFR 7SJ551 Appendix XC-IV XC-IV XE-IV XD-IV XB-Ill XE-Ill XB-II XD-Ill XE-ll XB-Ill XD-II XE-l XD-l OUTPUT 4 ~ l N pI u ~ OUTPUT 5 OUTPUT 6 f f f f- - - - - - - XB-I, XC-I XC-I - interface 1 f Temperature sensor I (8x1 XB-I RS-485 RxD XB-II t I I ,- - Fibre i2c Optic f * TxD RxD I I Figure A.3 General diagram for 7SJ551'-**A*O-2* - and 7SJ551 *-**A*O-3* MFR 7SJ551 CONNEC~UNSPLUGS (REAR VIM) Figure A.4 Lay-out of the connection terminals Appendix MFR 7SJ551 Appendix I I I I I I I I I I I 1 1 i I I I A, , ,L Figure A.5 I I I I I I I I I I I I I I I I I Terminal denomination XD * ' MFR 7SJ551 Typical wiring diagrams 2 c.t. connection for isolated, resonant earthed or high-ohmic earthed systems MENU: L1 ENABLED L3 ENABLED 2 c.t. connection with additional core balance c.t. for isolated, resonant earthed or high-ohmic earthed systems MENU: t i ENABLED 13 ENABLED e ENABLED Appendix MFR 7SJ551 3 c.t. connection (Holmgreen connection) for low-impedance earthed systems MENU: L1 ENABLED L2 ENABLED L3 ENABLED e ENABLED 3 c.t. connection with additional core balance c.t. for isolated, resonant earthed or high ohmic earthed systems MENU: L1 ENABLED L2 ENABLED L3 ENABLED e ENABLED Appendix * i MFR 7SJ551 Appendix Motor application example In this section an example is presented of how to configure and apply the MFR 7SJ551 relay as a motor protection relay. Data delivered by motor manufacturer Motor specification Value 61 Description Rated current Rated frequency No-load current (0,43 x rated current) rting current (5 x rated current) 50 26 305 60:l A Parameter IR Hz A A A lno load Istart S T i ,stat A kstat Motor thermal capacity data Description Thermal warming-up time constant (copper) Maximum allowable continuous current Permissible starts from cold motor condition from warm motor condition Running-up time at nominal voltage Maximum allowable running-up time from cold motor condition from warm motor condition Maximum allowable locked rotor time at nominal voltage Thermal cooling-down time constant jircuit configuration I Calculations I MFR 7SJ551 I I Parameter Value 294 318 3 1 10 30 10 10 1176 bold nwarrn S fstafi S ~ C O I b~ a S nwarm . tstart s S . CSIOO. stat it MFR 7SJ551 Appendix Thermal stator model MFR 7SJ551 uses a thermal stator model consisting of a short thermal time constant and a long thermal time constant to approximate the thermal behaviour in running mode accurately. For this motor only one time constant is available. Description Overload factor Thermal time constant 1 Thermal time constant 2 Weighting factor (interaction between two exponential curves) Value 1.08 294 unused 1 Parameter kstat S Ti,stat %stat Pweioht This means that the maximum allowable continuous current is 1.08 x 61 = 318 A. 1 For the stator thermal overload function the following formula is applicable. The only 'active' thermal time constant is T,,,,,, because pWeig,= 1 means that the second exponential part in the above formula disappears. When we load the motor at t = 0 with a constant continuous current , , I that is greater than kStatx lfl,, the relay will trip in a time ttd,. For different currents the following tripping times can be calculated: lrms (X IRC) constant continuous current beo~nnlnqat t=O 1.10 2.00 3.00 4.00 5.00 6.00 7.00 ttrip (s) preload = 0 980,O 101,O 40,9 22,2 14,1 9,7 7,1 itrip (s) preload = 60% 722,7 44,8 17,O 9,1 57 3,9 2,9 When the motor is stopped, it will cool down. The cooling down of the stator takes 4 times as long as the " I MFR 7SJ551 Appendix It is allowed to start 3 times from cold motor condition and 1 time from warm motor condition with starting time ,,,t = 10 s and starting current lsta, = 305 A. From these parameters the rotor thermal model is built according to the following formulas: Trotor = 8 - n c o ~ d* t start + 2 In(1 - o r 1 = 1 -3*10 = 465 s In(-, - 1,5 * 1 ~ 0 2 ~ 5 &art .)ram the 3 phase currents the normal and inverse components are calculated using the symmetric components method. These normal and inverse components are used to calculate the heating current. For this purpose we calculate the inverse factor k, out of: l?IC kinv ~ 2 3 0 . E t art I Description Inverse factor Value 9.2 1 Parameter 1 kinv This factor makes sure that asymmetric currents contribute additionally to the calculated heating of the motor: [:eating= l;orrn+ kin" * l$v When we start and load the motor at t = 0 with a constant symmetric continuous current,,,I that is greater than , , ,k x In,, the relay will trip in a time tt",. For different currents the following tripping times can be calculated according to: I MFR 7SJ551 lheat!ng (X Iflc) constant svmrnetrlc continuous current beq~nn~np at b 0 1.23 2 3 4 5 6 7 Appendix ttrlp (s) preload = 0 231 1 228 88 48 30 21 15 ttrlp (s) preload = 50 % 1899 122 44,4 23,5 14,6 10,O 7,3 When the actual starting time is less than 10 s, for example 5 s, it is allowed to make 10/5 x 3 = 6 starts from cold motor condition and 1015 x 1 = 2 starts from warm motor condition. When the motor is stopped, it will cool down. We assume that the cooling down of the rotor also takes 4 times as long as the warming up. Description Cooling down factor rotor \ Value 4.00 1 1 Parameter I CS~OD.~OI i Locked rotor protection The locked rotor protection works only during the motor status "start" and sees to it that the motor is tripped in time when the rotor is stuck and the thermal rotor model would allow a too long starting time. According to the customer data the permissible locked rotor time is 10 s, at maximum allowed starting current = 305 A. The tripping time is calculated according to: As the locked rotor condition is very critical, we take a safety margin of 1 s: Description Locked rotor time I 1 Value 9.00 ( Parameter I s I tlr With this we calculate: Short circuit protection For high-speed clearing of motor phase faults the following conditions must be fulfilled for the setting of the instantaneous elements I>>: a 1 " I MFR 7SJ551 Appendix p i n i m u m pick-up current greater than 1.6 times motor locked rotor current (maximum inrush due to asymmetry) - minimum pick-up current smaller than the minimum short-circuit current Differential protection should be provided if the above criteria are not met! In practice the maximum pick-up current must be smaller than circa 1/3 of the maximum occurring 3-phase short-circuit current. The locked rotor current equals 5 x IRc,SO I>> must be set on 1,6 x 5 x lac = 9 x It,, = 549 A. + Description Instantaneous pick-up current Value 549 [A Parameter I>> For motor protection it is beneficial to enable the 'curve switch' function in the mode 'status'. If we choose the motor status 'stop/start', this means that when the motor is at standstill or starting, the curve 2 will be active for overcurrent condition. When the motor is running, curve sets 1 will be active. In this way an adapt the overcurrent settings to the actual motor status. E I Fxample In the following example the overcurrent level during running mode is set at 200 A. Curve 2 (during stop/start) Description Low set overcurrent Low set overcurrent delay time High set overcurrent High set overcurrent delay time Curve 1 (during running mode) Description Low set overcurrent Low set overcurrent delay time High set overcurrent High set overcurrent delay time 1 Value 548 0.5 549 0.01 A s A s Parameter I> tI> I>> tl>> A s A s Parameter I> tl> I>> tl>> Value 200 0.5 549 0.01 MFR 7SJ551 Appendix Setting table For setting the relay 7SJ551 all current values must be transformed to match the nominal secondary current transformer current In= 1 A. As the motor currents are transformed by the current transformer with CT ratio 60 : 1 all current values have to be divided by 60. With this we get the following setting table. Parameter group DEVICE DATA Parameter LINE FREQUENCY Iflc DEVICE TYPE Motor value 50 61 MFR 7SJ551 50 1-02 ROTATING 0.43 Hz A setting Hz X In 26 A X In 305 A 5.08 X In 10 s f0 s tstafl 1.08 1.08 kstat 9.2 9.2 kin" 1 1 nwarrn 3 ................................................--.....--. 3 ".""...................................... "......... ............................................................... "....."........-..-.. ........d!,!. .....................".."........................... ............................ CHANNELS L1 E L2 E E L3 1 A I" CT temperature 60 sensor RATIOphase 28 X In .-......................... ........--........ ....I~!-!ase.rnax "......................................................................... ................................................................. -... THERMAL OVERLOAD 294 s 294 s 'h ,stat 3000 s 3000 s %,stat 1 1 Pweight 4 4 Cstop.stator 4 4 .-....-.....-.--.. -................................... ..~.~~~~!,rotor ..................................................................... .................................................... .......-....-..... LOW SET OVERCURRENT CHAR DEF 200 A CURVE 1 X In 3.33 !>I 0.5 s 0.5 s ti> ...... ............ ................................ .......- .! ..................................... .-............................ .................................... . ........................... ..................... LOW SET OVERCURRENT CHAR DEF 548 A CURVE 2 X In 9.13 1>2 0.5 s 0.5 s tl> ......".......................................... " ." ........2............................................ "-....... ..-..........."............................................... ............................................................................ HIGH SET OVERCURRENT I>>, 549 A 9.1 5 A 1 0.01 s 0.01 s tl>>l -............................."" .-CURVE ...................................... "...................................................... ........-........................................ "..," -. ........... " HIGH SET OVERCURRENT I>>* 549 A 9.15 A s CURVE 2 .........". . ."........................ 0.01 0.01 s ....................................... 2'.'.!!.. ........."................-"..............".-.. ......-....... "........................................................................................................................... ROTOR "........"..................... t!1. 9 s 9 s ....LOCKED ".......................................... "-......-.................... "..................... .............................. " ".........................................."....-.............-. CURVE SWITCH MODE S STATUS STPISTRT lno load istart " " " " " " " " Marshalling The 7SJ551 relay consists of 2 or 5 binary inputs and 4 or 6 output relays. The binary inputs can be set normally open or normally closed. One of the binary inputs can be used for example for 'remote reset'. The output relays can be set latched ('lock out'), temporarily latched or unlatched. We suggest to marshall all tripping conditions to output 1 and to connect output 1 to the circuit breaker. Output 2 can be used to annunciate an overload. Output 3 can be used to annunciate a locked rotor condition. Output 4 can be used to annunciate a short-circuit. (Optionally, output 5 can be used to annunciate earth faults separately. This leaves optional output 6 unmarshalled.) ! I ' I MFR7SJ551 @is \ Appendix way we obtain the following software matrix. Output 1 I Output 2 1 Output 3 1 Output 4 ( (Output 5) 1 (Output 6) X ............. ............................................ x . "....................... j .................................... .................".................... -....................................... Trip thermal overload -. ............"..." Trip b x I x "...........:; ................................... *................................... ..............".................... I:....................... .................... +................................... .... X Trip e> ................ "x ...............i ............................ .:........... ................. "...................................... I x i:................................... ............. Trip L>> ....._.... _ ....-X...............i................................... .............................................................................................................. ; x .i . ....................... ............. : X Trip e>> X : i.................................... i....................... x ....................................... j -: ....................................... Trip locked rotor X i ! X I ! ".! : *. A ... " " i -.i A " " 1 MFR 7SJ551 1 D Default vaikses The 7SJ.551 relay will be delivered with a setting in accordance with a default setting. This default setting in not a very sofisticated setting which normaly can be used for a very wide range of protection functions. Normally an adjusting of the default setting should be necessary. We recommend to check all the setting values, also in the cases that a setting value is equal with a default value. Appendix MFR 7SJ551 Ao~endix off line tl p-weight t-adj c-adj Q-warn 100 s 200 s 0.5 disabled 2 25 % OVERTEMPERATURE overtemperature alarm (all sensors) trip (all sensors) disabled 80 CO 100 CO UNDERCURRENT undercurrent t-bypass [motor] I< t I< disabled 5s 0.5 x In 3s LOW SET OVERCURRENT low set O.C.phase phase char. I> def, time t I> def. time Ip inv. time tp inv. time # of points (cust, curve) II t I1 12 t 12 13 t 13 14 t 14 15 t 15 16 t 16 17 t 17 18 t 18 19 t 19 110 t 110 111 t I11 112 t 112 113 t 113 114 t 114 115 t 115 low set O.C. earth earth char. le> def. time t le> def. time lep inv. time disabled definite 1.5 x In 5s 1.5 x In 1 15 1.5 x In 100 s 2.5 x In 90 s 3.0 x In 80 s 4.0 x In 70 s 5.0 x In 60 s 6.0 x In 50 s 7.0 x In 40 s 8.0 x In 30 s 9.0 x In 20 s 10.0 x In 15 s 12.5 x In 10 s 15.0 x In 5s 17.5 x In 2.5 s 20 x In 1.0 s 25 x In 0.5 s disabled definite 0.5 x In 5s 0.5 x In 12 DEVICE DATA line frequency (fn) full load (I-flc) device type lnoload [motor] I-starl [motor] t-start [motor] k-stat [motor] k [non-rotating] k-inv [motor] n-warm [motor] n-cold [motor] temperature sensor CHANNELS L1 AT-ratio lmax e len CT-ratio lemax lemax (sensitive) Uin U select Un VT-ratio parameter 50 Hz Ix In non-rotating 0.1 x In 4.0 x In 10 s 1.I 1.I 5 2 3 Pt 100 disabled disabled disabled 1A 1 28 x In disabled 1A 1 28 x len 1.4 x len disabled Uo 100 v 1 default setting PROTECTIONS THERMAL OVERLOAD [motor] disabled disabled ti-min input sensor t l ,stat t2,stat p-weight c-stop,stat c-stop,rot Q-warn start inhibit t-inh Q-stator emerg. restart 190 CO 40 C" 1 100 s 200 s 0.5 2 2 25 O/o disabled 5s 50 % disabled THERMAL OVERLOAD [non-rotatingdevice] thermal overload disabled ambient temp. disabled 190 CO T-max 40 C" 1 phase )ue RMS " MFR 7SJ551 tep inv. time # of points (cust. curve) lel t lel l e2 t le2 le3 t Ie3 le4 t le4 le5 t le5 le6 t le6 le7 t le7 le8 t le8 leg t leg lelO t lelO le?1 t lell le12 t le12 Ie13 t le13 le14 t lel4 le15 t le15 1 15 0.50 x len 200 s 0.55 x len 150 s 0.60 x len I00 s 0.65 x len 90 s 0.70 x len 80 s 0.75 x ten 70 s 0.80 x len 60 s 0.85 x len 50 s 0.90 x len 40 s 0.95 x len 30 s 1.0 x len 25 s 1.1 x len 20 s 1.2 x len 15 s 1.3 x len 10 s 1.35 x len 5s HIGH SET OVERCURRENT high set O.C. ph. I>> t I>> high set O.C. earth le>> t le>7 disabled 10 x In 0.5 s disabled Ix l n 2.5 s UNBALANCE unbalance t-bypass 12 t2P disabled Is 0.2 x In 10 s DIRECTIONAL EARTH FAULT DETECTION directional earthfault disabled control cosine U-strt 0.1 x Un t U-strt 5s If> forward If>> forward 0" fe dl 0" d2 0" d3 0" LOCKED ROTOR locked rotor f Appendix disabled t-lr ZERO SPEED zero speed t-zero disabled 10 s UNDERVOLTAGE undervoltage ~xxx<" t uxxxc') disabled 0.25 x Un 5s OVERVOLTAGE overvoltage t urn>'' ~xxx>>" t UXXX>>" BF TRIP BF trip extern I-bf t-bf disabled 0.75 x Un 5s 1 xUn 1s disabled disabled CURVE SWITCH curve switch mode t-CS (pulse mode) status (status mode)*) disabled continuous 10 s running BLOCK block mode t-BLOCK (pulse mode) status (status mode)" timers 1 I>> le> le>> U< disabled continuous 10 s running disabled enabled enabled disabled enabled disabled enabled EXTERNAL COMMAND ext. command t- EXT disabled 5s CB POSITION CB POSITION disabled TRANSIENT DATA start t-trip t-alarm intern 1.5 s 1.5 s REAL TIME CLOCK format rtc sync dd-mm-yy disabled 1 MFR 7SJ551 BINARY INPUTS binary input 1 binary input 2 binary input 3 binary input 4 binary input 5 extern (remote reset) remote reset t-adjust3' curve switch block mode (CW/CCW) CW/CCW emerg restart zero speed @md -13position dult rec serial event rtc sync OUTPUT RELAYS latch timer t-reset output relay 1 output relay 2 output relay 3 output relay 4 output relay 5 output relay 6 pre-alarm trip Q-th start L1> 2iart e> or f> trip e> or f> start L>> trip L>> start e>> or f>> trip e>> or f>> alarm UB trip UB alarm Uc trip U< alarm U> trip U> . alarm U>> trip U>> start inh (motor) Ikd rotor (motor) alarm T Appendix open open open open open disabled I (bin, input) 1 (bin, input) 1 (bin. input) 1 (bin. input) intern 1 (bin. input) I (bin. input) 1 (bin. input) 1 (bin. input) 1 (bin. input) 1 (bin. input) I(bin, input) 1 (bin. input) 1 (bin. input) disabled 600 s unlatched unlatched unlatched uniatched unlatched unlatched not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected le dir @ ie dir alarm zsp trip zsp BF trip ext. cmd not connected not connected not connected not connected not connected not connected LED INDICATORS LED1 LED2 LED3 LED4 trip Q-th start L> trip L> start e> or f> trip e> or f> start L>> trip L>> start e>> or f>> trip e>> or f>> alarm UB trip UB non-memorized non-memorized non-memorized non-memorized not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected not connected alarm Uc trip Uc alarm U> trip U> alarm U>> trip U>> start inh (motor) Ikd rotor (motor) alarm T trip T alarm I< trip Ic le dir @ le dir 7 alarm zsp trip zsp BF trip ext. cmd CB position not connected not connected not connected) not connected) not connected) not connected) not connected) not connected) not connected) not connected) not connected) not connected) not connected not connected not connected not connected not connected not connected not connected SERIAL COMMUNICATION adress baudrate event prtcl block 0 2400~) RS-485 disabled LSA disabled COUNTERS this menu part has no default setting ALARM/TRIP DATA alarm event nr. trip event nr. n (last one) n (last one) DEMAND AMMETER this menu part has no default setting . MFR 7SJ551 RUNNING HOURS this menu part has no default setting MANUFACTURlNG DATA this menu part has no default setting Appendix 1) U u x = Un-In for the phase to phase voltage or U-Ph for the phase to earth voltage or Uo for the zero sequence voltage 2) Only for rotating device 3) non rotating device 4) factory value but will not change with a reset i SIEMENS advice of return 7SJ55 from number adress for advice of return original reference Siemens The Hague Siemens Nederland N.V. Department EV TD mrs. C. Groos P.O. Box 16068 NL-2500 BB THE HAGUE The Netherlands date 38................... original dispatch note number date D8.. ................ your order number name of sender date department forward~ngaddress for return of reiay(s) to repair ordering date date of sending teiephone number fax number mode of dispatch Siemens Nederland N.V. Industrial Centre Zoetermeer Department PI PROD (Room 83.0.17) mister R. Boender Werner von Siemensstraat 1 NL-2712 PN ZOETERMEER The Netherlands custom value of goods reason for returning goods item description / MLFB code 1 serial number / firmware version / error description1 quantit action desired cross) Y (please mark w~tha credit note replacement free of charge repair under guarantee repair against charge (Ih~sadvhce of return counts a s repair order) El cost estimate desired return of goods on loan 17 repair report forwarding address for return of replacement or reparred goods end customer * MFR 7SJ551 1 F Advice of return 78555 I Appendix

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