Reyrolle
Protection
Devices
7SR45 Argus User Manual
Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay
© 2018 Siemens Protection Devices
2
7SR45 Argus Contents
Contents
Technical Manual Chapters
1.
Description of Operation
2.
Settings, Configuration & Instruments
3.
Performance Specifications
4.
Data Communications Definitions
5.
Installation
6.
Commissioning and Maintenance
7.
Applications Guide
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
© 2018 Siemens Protection Devices
Chapter 1 - 7SR45 Description of Operation
7SR45
Description of Operation
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
Software Revision History
2018/04
2438H80001R2a-1a
Second Release
2017/08
2438H80001R1e-1a
Software maintenance to suit customer requirements
2017/01
2438H80001R1d-1a
• Protection function 50, 50N, 50G setting range change to 0.2xIn to 20xIn
in step of 0.1xIn.
• Protection function 50, 50N, 50G reset ratio changed to 91% for setting
below 1xIn and 95% for setting above 1xIn.
2016/10
2438H80001R1c-1a
Software maintenance to suit customer requirements
2016/09
2438H80001R1b-1a
• Faster response times on 1 phase (t+100ms max) in 0.2 to 0.3 ranges.
2015/08
2438H80001R1a-1a
• IRF functionality.
First Release
Hardware Revision History
2018/04
7SR450/EE
Second Release
(with Aux. Power supply, remote flag and local flag, RS 485, additional
AC/DC BIs and BOs)
2017/02
7SR450/DD
Hardware maintenance
2016/09
7SR450/CC
Circuit changes to improve signal conditioning
2015/08
7SR450/BB
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2018 Siemens Protection Devices
Chapter 1 - 7SR45 Description of Operation
Contents
Open Source Software............................................................................................................................... 7
Section 1: Introduction ....................................................................................................................................... 8
1.1 Current Transformer Circuits .............................................................................................................. 8
1.2 External Resistors.............................................................................................................................. 8
1.3 Description ........................................................................................................................................ 8
1.4 Ordering Options ............................................................................................................................... 9
1.5 Functional Diagram.......................................................................................................................... 10
1.6 Terminal Diagram ............................................................................................................................ 11
Section 2: Hardware Description ...................................................................................................................... 14
2.1 General ........................................................................................................................................... 14
2.2 Front Fascia .................................................................................................................................... 14
2.2.1
Front Fascia with Flag Output ............................................................................................. 14
2.2.2
Front Fascia without Flag Output ........................................................................................ 15
2.3 Power Supply Unit (PSU) ................................................................................................................. 15
2.4 Connectors...................................................................................................................................... 16
2.4.1
Connectors for Self and Dual Powered Relay Variant .......................................................... 16
2.5 Operator Interface............................................................................................................................ 17
2.6 Relay Information ............................................................................................................................ 18
2.6.1
Liquid Crystal Display (LCD) ............................................................................................... 19
2.6.2
Keypad .............................................................................................................................. 19
2.6.3
Light Emitting Diode (LED) ................................................................................................. 20
2.6.4
Local Flag .......................................................................................................................... 21
2.7 Home Screen .................................................................................................................................. 21
2.8 Password Protection ........................................................................................................................ 21
2.9 Software Version Menu .................................................................................................................... 22
2.10 Alert Screen .................................................................................................................................... 22
2.10.1 Fault Alert (Trip Alert) ......................................................................................................... 22
2.10.2 Alarm Alert ......................................................................................................................... 22
2.10.3 Info Alert ............................................................................................................................ 22
2.11 Parameter Edit Screen ..................................................................................................................... 23
Section 3: Protection Functions (50, 51, 50N, 51N, 50G, 51G, 50LC) ................................................................ 24
3.1 Instantaneous Overcurrent Protection (50)........................................................................................ 24
3.2 Time Delayed Overcurrent Protection (51) ........................................................................................ 25
3.3 Instantaneous Derived Earth Fault Protection (50N).......................................................................... 27
3.4 Time Delayed Derived Earth Fault Protection (51N) .......................................................................... 28
3.5 Instantaneous Measured Earth Fault Protection (50G) ...................................................................... 30
3.6 Time Delayed Measured Earth Fault Protection (51G) ...................................................................... 31
3.7 Switch-On-To-Fault (50LC/SOTF) .................................................................................................... 33
3.8 General Alarm ................................................................................................................................. 35
3.9 Reset LED, Trip Flag Indication and Binary Outputs.......................................................................... 35
3.9.1
Reset through Binary Input ................................................................................................. 36
3.9.2
Reset using Reydisp Software ............................................................................................ 36
3.9.3
TEST/RESET► Key........................................................................................................... 36
3.9.4
Reset through rear communication protocol ........................................................................ 36
3.10 Current Inputs.................................................................................................................................. 37
3.11 Binary Inputs ................................................................................................................................... 37
3.12 Binary Outputs................................................................................................................................. 39
3.12.1 Binary Output Matrix........................................................................................................... 39
3.12.2 Binary Output Configuration................................................................................................ 39
3.13 Binary Output Operations................................................................................................................. 40
3.13.1 BO Trip/Reset on Battery/USB............................................................................................ 40
3.13.2 BO Trip/Reset on CT Input or Auxiliary Voltage ................................................................... 40
3.14 Pulse Output ................................................................................................................................... 41
3.15 Remote Flag Output ........................................................................................................................ 41
©2018 Siemens Protection Devices
Chapter 1 Page 2 of 48
Chapter 1 - 7SR45 Description of Operation
3.16 Modes of Operation ......................................................................................................................... 41
3.16.1 Auxiliary Voltage ................................................................................................................ 41
3.16.2 CT Input............................................................................................................................. 41
3.16.3 USB ................................................................................................................................... 43
3.16.4 Battery ............................................................................................................................... 43
3.16.5 Sleep Mode........................................................................................................................ 44
3.16.6 Low Battery Status Indication.............................................................................................. 44
3.17 Maintenance Mode .......................................................................................................................... 44
3.17.1 Output Test ........................................................................................................................ 44
3.18 Self Monitoring ................................................................................................................................ 44
3.18.1 Internal Relay Failure (IRF)................................................................................................. 44
3.19 Data Storage ................................................................................................................................... 45
3.19.1 Fault Records (Trip Log) ..................................................................................................... 45
3.19.2 Event Records (Event Log) ................................................................................................. 46
3.20 Real Time Clock .............................................................................................................................. 46
3.21 Operating Mode............................................................................................................................... 46
3.22 Settings Groups............................................................................................................................... 47
3.23 Password Feature............................................................................................................................ 47
3.24 Battery ............................................................................................................................................ 48
3.25 Firmware Update ............................................................................................................................. 48
List of Figures
Figure 1-1
Figure 1-2
Functional Diagram of 7SR45 Argus Relay........................................................................................ 10
Terminal Diagram of Self Powered (7SR4501-xGA10-1AA0) Non-Directional Overcurrent
and Earth Fault Relay without Flag.................................................................................................... 11
Figure 1-3
Terminal Diagram of Self Powered (7SR4501-xGB10-1AA0) Non-Directional Overcurrent
and Earth Fault Relay with Flag ........................................................................................................ 12
Figure 1-4
Terminal Diagram of Dual Powered (7SR4501-x[H/J]B10-1AA0) Non-Directional
Overcurrent and Earth Fault Relay without Flag................................................................................. 12
Figure 1-5
Terminal Diagram of Dual Powered (7SR4502) Non-Directional Overcurrent and Earth
Fault Relay with Flag ........................................................................................................................ 13
Figure 2-1
7SR45 Argus Relay Front Fascia with Flag Output ............................................................................ 14
Figure 2-2
7SR45 Argus Relay Front Fascia without Flag Output........................................................................ 15
Figure 2-3 7SR45 Argus Relay Connectors with 4 BI and 4 BO.................................................................................. 16
Figure 2-4 7SR45 Argus Relay Connectors with 2 BI and 2 BO.................................................................................. 16
Figure 2-4
7SR4501 Argus Relay LED Indication Label ...................................................................................... 17
Figure 2-5
7SR4502 Argus Relay LED Indication Label (With Flag) .................................................................... 17
Figure 2-6
7SR4502 Argus Relay LED Indication Label (Without Flag) ............................................................... 17
Figure 2-7
Warning Symbols ............................................................................................................................. 18
Figure 2-8
Relay LCD ....................................................................................................................................... 19
Figure 3-1
Logic Diagram: Instantaneous Overcurrent Element .......................................................................... 24
Figure 3-2
Logic Diagram: Time Delayed Overcurrent Element .......................................................................... 25
Figure 3-3
Logic Diagram: Instantaneous Derived Earth Fault Element .............................................................. 27
Figure 3-4
Logic Diagram: Time Delayed Derived Earth Fault Protection ........................................................... 28
Figure 3-5
Logic Diagram: Instantaneous Measured Earth-fault Element ........................................................... 30
Figure 3-6
Logic Diagram: Time Delayed Measured Earth Fault Element ........................................................... 31
Figure 3-7
Logic Diagram: 50LC Overcurrent Element....................................................................................... 33
Figure 3-8
Operating Time for Single Phase Fault with Binary Output ................................................................ 34
Figure 3-9
Operating Time for Single Phase Fault with Pulse Output ................................................................. 34
Figure 3-10
Reset LEDs Outputs: Reydisp Software Input Matrix......................................................................... 36
Figure 3-11
Reset Flags ..................................................................................................................................... 36
Figure 3-12
Binary Input Logic............................................................................................................................ 37
Figure 3-13
Binary Output Logic ......................................................................................................................... 39
Figure 3-14
Sensitivity for Single Phase Fault with Binary Output ........................................................................ 42
Figure 3-15
Sensitivity for Single Phase Fault with Pulse Output ......................................................................... 42
©2018 Siemens Protection Devices
Chapter 1 Page 3 of 48
Chapter 1 - 7SR45 Description of Operation
1.
If the calculated operating time is less than the boot up time as shown in the sensitivity
graph (Figure 3-14, Figure 3-16), then the optimization is not effective. .............................................. 43
©2018 Siemens Protection Devices
Chapter 1 Page 4 of 48
Chapter 1 - 7SR45 Description of Operation
Symbols and Nomenclature
The following notational and formatting conventions are used within the remainder of this document:
•
•
•
•
Setting Menu Location
Setting:
Setting value:
Alternatives:
©2018 Siemens Protection Devices
MAIN MENU>SUB-MENU
Elem name -Setting
value
[1st] [2nd] [3rd]
Chapter 1 Page 5 of 48
Chapter 1 - 7SR45 Description of Operation
DANGER
!
Danger of explosion of the battery.
Noncompliance with the safety instructions means that death, severe injuries, or
considerable material damages can occur.
Do not throw the lithium batteries into a fire.
WARNING
Warning about battery disposal.
!
Noncompliance with the safety instructions means that severe injuries or considerable
material damages can occur.
When discharged, or when properly secured against short-circuit, lithium batteries can be
disposed off through retailers or at depots run by competent organizations.
NOTE:
7SR45 Argus Relay with 1 contained lithium metal cylindrical cell (0.6 g lithium content) and 1
lithium metal button cell meets the preconditions of special provision (SP)188 of the UN
th
Recommendations on the Transport of Dangerous Goods, 17 revised edition and is classified
according to:
 ADR/RID/ADN/IMDG-Code: UN 3091 Lithium metal batteries contained in equipment,
class 9, preconditions of SP 188 met.
 ICAO-TI/IATA-DGR: UN 3091 Lithium metal batteries contained in equipment, class 9,
preconditions of section II of packing instruction (PI) 970 met.
Do not transport the 7SR45 Argus Relay when it is activated. Before transportation, ensure that
the 7SR45 Argus Relay is “not in the battery power mode” and paper strip is inserted
between the battery clip and battery.
The lithium metal cells for 7SR45 Argus Relay (as a spare part) are also subject to the special
provision (SP)188 mentioned above, but classified according to:
 ADR/RID/AND/IMDG-Code: UN 3090 Lithium metal batteries, class 9, preconditions of SP
188 met.
 ICAO-TI/IATA-DGR: UN 3090 Lithium metal batteries, class 9, preconditions of section IB
or II of packing Instruction (PI) 968 met.
©2018 Siemens Protection Devices
Chapter 1 Page 6 of 48
Chapter 1 - 7SR45 Description of Operation
Open Source Software
The product contains, among other things, Open Source Software developed by third parties. The Open Source
Software used in the product and the license agreements concerning this software can be found in the
Readme_OSS. These Open Source Software files are protected by copyright. Your compliance with those license
conditions will entitle you to use the Open Source Software as foreseen in the relevant license. In the event of
conflicts between Siemens license conditions and the Open Source Software license conditions, the Open Source
Software conditions shall prevail with respect to the Open Source Software portions of the software. The Open
Source Software is licensed royalty-free. Insofar as the applicable Open Source Software License Conditions
provide for it you can order the source code of the Open Source Software from your Siemens sales contact against payment of the shipping and handling charges - for a period of at least 3 years since purchase of the
Product. We are liable for the Product including the Open Source Software contained in it pursuant to the license
conditions applicable to the Product. Any liability for the Open Source Software beyond the program flow intended
for the Product is explicitly excluded. Furthermore any liability for defects resulting from modifications to the Open
Source Software by you or third parties is excluded. We do not provide any technical support for the Product if it
has been modified.
©2018 Siemens Protection Devices
Chapter 1 Page 7 of 48
Chapter 1 - 7SR45 Description of Operation
Section 1: Introduction
This manual is applicable to the following relay:
•
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay
General Safety Precautions
1.1
Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel or damage to equipment.
1.2
External Resistors
Where external resistors are connected to the relay circuitry, these may present a danger of electric
shock or burns, if touched.
1.3
Description
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay is developed using
the latest generation of hardware technology and is available in multiple variants depending on the following:
•
•
•
•
•
•
CT ratings (1 A/5 A)
Auxiliary Power supply
Communication configuration
Binary Input
Binary Output
Local/remote Flag Indicator
®
7SR45 Argus is a member of Siemens Reyrolle protection devices Argus product family.
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay is housed in a
4U high, size 4 non draw-out case and provides protection, monitoring, and instrumentation functions with
integrated input and output logic and fault reports.
The relay functionality can be configured via a front USB port for local PC connection or rear electrical RS485
(optional) port for remote connection. By using the Reydisp Evolution software, the user can update the settings
and view the fault records (trip log) and the event records (event log).
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay support the
IEC 60870-5-103 and Modbus communication protocols based on the ordering option.
7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay can indicate the trip
with local and remote flag indicator based on the ordering option.
NOTE:
In this Technical Manual, the 7SR45 Argus Self Powered/Dual Powered Non-Directional Overcurrent and
Earth Fault Relay will be referred as 7SR45 Argus Relay.
©2018 Siemens Protection Devices
Chapter 1 Page 8 of 48
Chapter 1 - 7SR45 Description of Operation
1.4
Ordering Options
Product description Variants
Order No.
1 2 3 4 5 6 7 7 S R 4 5 0
-
7SR45 Argus
8
9
10 11 12 - 13 14 15 16
0 - 1 A A 0
Nondirectional
Overcurrent
and Earth
Fault Relay
Case, I/O and fascia
1)
Size 4 Moulded Case, 4 CT , 2 BI/2 BO, pulse output, 9 LEDs
1)
Size 4 Moulded Case, 4 CT , 2 BI/2 BO, pulse output, 9 LEDs
1)
Size 4 Moulded Case, 4 CT , 4 BI/4 BO, pulse output, 9 LEDs
1
G
A/B
1
H/J
A
2
H/J
B
Measuring Input
1 A, 50/60Hz
5 A, 50/60Hz
1
2
Auxiliary Voltage
Self Powered (CT Powered : BI Threshold 19V DC)
Dual powered (CT Powered + Aux. Powered : 24-60 V DC, BI threshold 19 V DC)
Dual powered (CT Powered + Aux. Powered : 60-240V AC/DC, BI threshold 88V
AC/DC)
Front Fascia
Standard Version
Standard Version - with Trip Flag Indicator
G
1
H
2
J
2
A
B
Communication Options
Front port : USB
Front Port : USB and Rear Port : RS-485 supporting IEC 60870-5103 and Modbus RTU (user selectable setting)
1
2
Protection Function Packages - Standard version
50
Instantaneous phase fault overcurrent
50G/50N
Instantaneous earth fault
51
Time delayed phase fault overcurrent
51G/51N
Time delayed earth fault
50LC/SOTF Switch-On-To-Fault
A
Additional functionality
No additional functionality
A
1) 4CT is configured as 3PF + EF
Use the following ordering information to order 7SR45 Argus Relay battery spares.
Table 1-1
Battery Spares Ordering Options
Variants
Description
7XG1900-1AA00-0AA0
Main Battery CR123A
7XG1900-2AA00-0AA0
RTC Battery CR1632
7XG1900-3AA00-0AA0
Main Battery CR123A + RTC Battery CR1632
NOTE:
If possible, it is recommended to procure the battery as per the Table 1-1 from the local supplier or local market.
©2018 Siemens Protection Devices
Chapter 1 Page 9 of 48
Chapter 1 - 7SR45 Description of Operation
1.5
Functional Diagram
7SR45
IL1
(IA)
IL2
(IB)
IL3
(IC)
IL4
(IG)
50
(x2)
51
50LC/
SOTF
50
(x2)
51
50LC/
SOTF
50
(x2)
51
50N
(x2)
51N
50G
(x2)
Figure 1-1
©2018 Siemens Protection Devices
50LC/
SOTF
51G
Functional Diagram of 7SR45 Argus Relay
Chapter 1 Page 10 of 48
Chapter 1 - 7SR45 Description of Operation
1.6
Terminal Diagram
The 7SR45 Argus Relay is housed in a non draw-out 4U size 4 case. The rear connection comprises of
user-friendly pluggable type terminals:
•
Binary Input (BI)
•
Binary Output (BO)
•
Pulse Output (PO)
•
Fixed Terminal Current Transformer (CT) (non-pluggable)
•
Remote Flag Indicator
•
RS485 Communication Port
•
Auxiliary Power Supply
7SR4501 Terminal Label
X5
X1
1
2
3
4
1A/5A
+ve
BI 1
-ve
+ve
IL1
BI 2
-ve
1
2
1A/5A
3
X2
NO
1
COM
2
NC
3
IL2
BO 1
4
1A/5A
4
BO 2
5
IL3
6
1
2
5
6
X3
-ve
+ve
1A/5A
7
PO
IL4
GND
8
NOTES:
Items shown in BOLD are ordering options
Figure 1-2
Terminal Diagram of Self Powered (7SR4501-xGA10-1AA0) Non-Directional Overcurrent
and Earth Fault Relay without Flag
©2018 Siemens Protection Devices
Chapter 1 Page 11 of 48
Chapter 1 - 7SR45 Description of Operation
7SR4501 Terminal Label
X1
X2
1
2
3
4
BI 1
-ve
6
COM
7
NC
8
1
IL1
+ve
2
BI 2
-ve
1A/5A
5
NO
1A/5A
+ve
3
IL2
BO 1
4
9
1A/5A
BO 2
10
5
IL3
11
12
6
13
+ve
-ve
14
GND
15
16
1A/5A
PO
IL4
+ve
-ve
7
FO
8
NOTES:
Items shown in BOLD are ordering options
Figure 1-3
Terminal Diagram of Self Powered (7SR4501-xGB10-1AA0) Non-Directional Overcurrent and
Earth Fault Relay with Flag
7SR4501 Terminal Label
X1
X2
1
+ ve
2
-ve
3
+ ve
4
- ve
BI1
NO
X4
A/+
2
3
GND
4
B/-
RS 485
TERM
1
IL1
BI2
2
1A/5A
5
1
1A/5A
3
7SR4501-1HB20-1AA0
6
COM
7
NC
8
BO1
IL2
4
9
1A/5A
BO2
10
11
5
IL3
12
X3
1
L
2
N
3
E
GND
13
+ ve
14
- ve
15
+ ve
16
- ve
6
1A/5A
PO
7
IL4
FO
8
NOTES:
Items shown in BOLD are ordering options
Figure 1-4
Terminal Diagram of Dual Powered (7SR4501-x[H/J]B10-1AA0) Non-Directional Overcurrent and
Earth Fault Relay without Flag
©2018 Siemens Protection Devices
Chapter 1 Page 12 of 48
Chapter 1 - 7SR45 Description of Operation
7SR4502 Terminal Label
1
+ve
2
- ve
3
+ve
4
-ve
1
BI3
BI4
X4
1
A /+
2
3
GND
RS 485
TERM
B/-
4
X1
X2
X5
+ ve
2
-ve
3
+ ve
4
- ve
BI1
X6
6
NO
1
COM
7
COM
2
BO3 NC
8
BI2
2
1A/5A
NC
3
4
5
BO1
3
7SR4502-1HB20-1AA0
IL2
4
9
BO 4
1
IL1
5
NO
1A/5A
1A/5A
BO2
10
11
5
IL3
12
X3
1
L
2
N
3
E
GND
13
+ ve
14
- ve
15
+ ve
16
- ve
6
1A/5A
PO
7
IL4
FO
8
NOTES:
Items shown in BOLD are ordering options
Figure 1-5
Terminal Diagram of Dual Powered (7SR4502) Non-Directional Overcurrent and Earth Fault Relay
with Flag
The CT terminals are suitable for ring type lug connection and to provide a secure and reliable termination.
©2018 Siemens Protection Devices
Chapter 1 Page 13 of 48
Chapter 1 - 7SR45 Description of Operation
Section 2: Hardware Description
2.1
General
The structure of the 7SR45 Argus relay is based on the compact hardware platform. The 7SR45 Argus relay is
supplied in a non draw-out 4U high size 4 case. The hardware design provides a commonality between the
products and components across the range of relays.
The 7SR45 Argus Relay is assembled from the following modules:
1.
Front Fascia with 9 non-programmable LEDs
2.
Processor Module
3.
Current Analogue
4.
Input Module
5.
Output Module
6.
Power Supply Module
7.
Rear Port Communications Module (Available with dual powered model)
2.2
Front Fascia
The front fascia is an integral part of the relay and allows the user to access all the push buttons and performs the
setting changes and control actions. The fascia provides an option to reset the fault data display, latched binary
outputs, and LEDs by using the TEST/RESET ► button. The front fascia contains predefined LED list which
provides the information about the LED indicators.
2.2.1
Front Fascia with Flag Output
Figure 2-1
©2018 Siemens Protection Devices
7SR45 Argus Relay Front Fascia with Flag Output
Chapter 1 Page 14 of 48
Chapter 1 - 7SR45 Description of Operation
2.2.2
Front Fascia without Flag Output
Figure 2-2
2.3
7SR45 Argus Relay Front Fascia without Flag Output
Power Supply Unit (PSU)
The relay is supplied with the following nominal power supply ranges:
•
88V AC/DC BI threshold available with 60V – 240V AC/DC power supply version
•
19V DC BI threshold with 24V – 60V DC power supply version
The power supply module is equipped with 2 or 4 binary inputs and binary outputs based on the ordering options.
The PSU also consists of one RS485 communication interface (half duplex) for communicating with RTUs and
parameterization of relays via remote locations.
For AC connections, the auxiliary supply is made with the live connection to positive terminal and neutral
connection to negative for consistency and safety.
If the power supply voltage levels are falling below the relay minimum operate level, the 7SR45 Argus relay power
will automatically switch over to CT power through phase CT currents.
©2018 Siemens Protection Devices
Chapter 1 Page 15 of 48
Chapter 1 - 7SR45 Description of Operation
2.4
Connectors
In 7SR45 Argus Relay, all the connectors are pluggable type except the CT connectors. The relay consists of the
following connectors and the connector terminals are designated suitably:
•
Auxiliary power supply
•
Remote flag output
•
Pulse output
•
Binary inputs
•
Binary outputs
•
RS485 connectors
2.4.1
Connectors for Self and Dual Powered Relay Variant
The power supply module is equipped with additional two numbers of binary input and binary outputs. It also
consists of RS485 communication port at the rear side.
Current
Inputs
Additional
Binary Inputs
Binary inputs
Binary outputs,
Flag output,
Pulse output
Rear
Communication
Port
Additional
Binary Outputs
Auxiliary
Power Supply
Figure 2-3 7SR45 Argus Relay Connectors with 4 BI and 4 BO
Current
Inputs
Binary
inputs
Binary
outputs,
Flag output,
Pulse output
Figure 2-4 7SR45 Argus Relay Connectors with 2 BI and 2 BO
©2018 Siemens Protection Devices
Chapter 1 Page 16 of 48
Chapter 1 - 7SR45 Description of Operation
2.5
Operator Interface
The operator interface is designed to provide a user-friendly method of entering the settings and retrieving data
from the relay.
The rating label is located on the housing and provides more technical information about the 7SR45 Argus Relay.
Figure 2-5
Figure 2-6
7SR4501 Argus Relay LED Indication Label
7SR4502 Argus Relay LED Indication Label
(With Flag)
©2018 Siemens Protection Devices
Figure 2-7
7SR4502 Argus Relay LED Indication
Label (Without Flag)
Chapter 1 Page 17 of 48
Chapter 1 - 7SR45 Description of Operation
2.6
Relay Information
The rating label contains the following product Information:
•
Product name
•
Auxiliary voltage range
•
Rated burden
•
Nominal current rating
•
Rated frequency
•
Binary input supply rating
•
MLFB ordering code, with hardware version suffix
•
Serial number
Where,
GF – Goa factory
YY – Year of manufacturing
MM – Month of manufacturing
XXXXXX – Serial number of the relay
For safety reasons, the following warning symbols are displayed on the label.
Figure 2-8
Warning Symbols
7SR45 Argus Relay consists of the following Human machine interface (HMI):
1.
2.
3.
4.
5.
6.
LCD
Keypads
LED
Trip flag indicator
USB
Battery Cover
©2018 Siemens Protection Devices
Chapter 1 Page 18 of 48
Chapter 1 - 7SR45 Description of Operation
2.6.1
Liquid Crystal Display (LCD)
The 7SR45 Argus Relay consists of 16x2 LCD to display the settings, instrumentation, and fault data.
By using the LCD, the user can view or edit a configuration parameter. The LCD allows the user to view the
following:
•
Real time status of relay such as BI and BO
•
Battery profile
•
Auxiliary power status
•
Primary and secondary current values of each phase and earth
•
General alarms
LCD displays the stored fault information to the user. When any fault condition occurs, the relay displays the latest
fault information on LCD.
General Alarms are user defined text messages displayed on the LCD when mapped to binary inputs. Up to four
general alarms can be programmed, each triggered from one or more input. Each general alarm will also
generate an event.
The backlight TURNS ON automatically if the 7SR45 Argus Relay is powered on with phase CT input and the
current is more than 0.4xIn (single phase) or 0.14xIn (three phase). If the 7SR45 Argus Relay is energized with
current less than the defined limits, the backlight does not TURN ON.
If the 7SR45 Argus Relay is powered on by inserting a USB cable, the backlight TURNS ON automatically.
The backlight can be turned off manually by pressing the backlight key. The backlight TURNS OFF automatically
to save energy if the user does not perform any activity in the HMI for more than 30 seconds.
In the phase CT power mode, the 7SR45 Argus Relay periodically monitors that sufficient current is available to
TURN ON the backlight.
In the USB or battery power mode, if the backlight is already TURNED ON and if the phase CT input is provided,
the backlight TURNS OFF due to the switching of power mode from USB or Battery to CT power. The backlight
can be TURNED ON again if sufficient current is available.
For more information about power source, refer to Modes of Operation.
Figure 2-9
2.6.2
Relay LCD
Keypad
The 7SR45 Argus Relay keypad consists of 5 standard keys for navigation and for editing the values. The
standard keys are used to navigate the menu structure and configure the relay functions.
The 2 additional keys are available for LCD backlight and battery mode.
The keys are used for the following functions:
•
To display and edit the relay settings
•
To display the relay instrumentation and fault data
•
To reset the output relays and LEDs
©2018 Siemens Protection Devices
Chapter 1 Page 19 of 48
Chapter 1 - 7SR45 Description of Operation
This push-button is used to navigate the menu structure or to increase the parameter value
in the edit mode.
This push-button is used to navigate the menu structure or to decrease the parameter
value in the edit mode.
This push-button is used to reset the fault indication on the fascia. This push-button is also
used for selecting the menu or selecting parameter values in the edit mode. By using this
push-button, the user can acknowledge the LEDs, binary output, and trip flag indication.
This push-button is used for selecting the parameter or confirming the values. The ENTER
push-button is used to initiate and accept the setting changes.
Press ENTER to edit the parameter setting. The setting value flashes and can be changed
by using the ▲ or ▼ keys.
This push-button is used to return the relay display to its initial status or one level up in the
menu structure. Press CANCEL to return to the previous menu or to cancel the value.
This push-button is used to reject any alterations to a setting while in the edit mode.
Press CANCEL key repeatedly to return to the Relay Identifier screen.
This push-button is used to power-on and power-off the relay with battery power when the
auxiliary power, CT power, and USB power are not available.
This push-button is used to TURN ON and TURN OFF the backlight.
2.6.3
Light Emitting Diode (LED)
2.6.3.1
Indication
The 7SR45 Argus relay consists of 9 non-programmable LEDs. LED indicates the operating status of the relay
such as TRIP READY and PICKUP.
The pre-defined LED functions are:
Table 2-1
LEDs
Predefined Names
Indication Color
LED Functions
Functions
LED 1
PROT. HEALTHY
GREEN
Indicates the relay protection function in a healthy state
LED 2
TRIP
RED
The trip indication for the phase/earth faults
LED 3
PICKUP
AMBER
The pickup indication for the phase/earth faults
LED 4
IL1 / A
RED
The pickup indication for phase A fault
LED 5
IL2 / B
RED
The pickup indication for phase B fault
LED 6
IL3 / C
RED
The pickup indication for phase C fault
LED 7
IE / E
RED
The pickup indication for Derived/Measured Earth fault
LED 8
TRIP READY
GREEN
The sufficient energy available for tripping
LED 9
LOW BATTERY
AMBER
The battery voltage is less than the operating level
©2018 Siemens Protection Devices
Chapter 1 Page 20 of 48
Chapter 1 - 7SR45 Description of Operation
2.6.3.2
Protection Healthy LED
The steady illumination of Protection Healthy LED indicates that the required CT current 0.20xIn (minimum phase
current) in single phase or 0.13xIn (minimum phase current) in three phases or auxiliary power supply is applied
to the relay and the relay is functioning healthy.
2.6.3.3
Trip Ready LED
The steady illumination of Trip Ready LED indicates that required CT current 0.20xIn (minimum phase current)
in single phase or 0.13xIn (minimum phase current) in three phases or auxiliary power supply is applied to the
relay and the relay is having sufficient energy to trip through the impulse output.
2.6.3.4
Low Battery LED
The low battery LED indicates when the battery voltage falls below the sufficient operating voltage.
2.6.4
Local Flag
An electromechanical bi-stable flag is provided in the front fascia to indicate the trip condition. The status of flag is
GREEN in normal condition and turns RED during the trip condition.
NOTE:
The energy required to show the trip indication is provided by the auxiliary voltage or phase currents.
The flag indicates a trip indication when any protection function operates or any binary inputs are mapped to trip
pulse output.
The trip indication is retained even in the absence of auxiliary voltage and phase currents.
The trip indication can be reset with any power mode. Refer to Modes of operation.
2.7
Home Screen
After the 7SR45 Argus relay is powered on, the user can access or navigate to other menus from the Home
Screen.
The following operations can be performed from the home screen:
ENTER
Press ENTER key to navigate to SETTING MODE.
READ UP
Press READ UP key to navigate to MAINTENANCE TAB under SETTING MODE.
READ DOWN
Press READ DOWN key to navigate to SETTING MODE.
CANCEL
Press CANCEL key to navigate back to the Home screen.
TEST/RESET►
Press TEST/RESET► key to reset the local flag and the LEDs .
CANCEL+TEST/RESET►
Press CANCEL+TEST/RESET► key to navigate to SOFTWARE VERSION.
2.8
Password Protection
The 7SR45 Argus relay allows the user to set the password via SETTING MODE > SYSTEM CONFIG >
PASSWORD. The length of the password must be 4 characters.
NOTE:
Only alphanumeric and 3 special characters such as “+”, “–“, and “/” are allowed.
The user password can be disabled by configuring as NONE.
From the parameter view screen, the user enters the password and presses ENTER for validation. If the entered
password is valid, the next screen appears. If the password is invalid, LCD displays the password retry screen
again.
After the successful log on and editing of parameter, password prompt screen does not appear until the log on
expires.
If the user does not perform any operation for more than 1 minute, the login expires and unsaved settings will be
discarded.
©2018 Siemens Protection Devices
Chapter 1 Page 21 of 48
Chapter 1 - 7SR45 Description of Operation
2.9
Software Version Menu
The software version menu can be viewed by holding the CANCEL key and followed by pressing of
TEST/RESET► key on Home Screen and then releasing both the keys simultaneously. The user can view the
software information by pressing ▲ or ▼key.
The software version menu contains the following information:
Firmware Art No.
The firmware article number installed in the relay
Build Date
The date of software version build
Build Time
The time of software version build
Serial No
The serial number of the relay
MLFB
MLFB number of the relay
Product Name
Product name for display
Product Art No
Unique number of the product assigned by SIEMENS
2.10 Alert Screen
2.10.1 Fault Alert (Trip Alert)
When any fault is detected by the relay, LCD pops-up the fault alert. Any previous alert pop-up messages are
updated or replaced by the latest message.
2.10.2 Alarm Alert
Alarm alert appears when any binary input is configured for general alarm and it is triggered.
2.10.3 Info Alert
Info alert displays the required information to the user. Info alert will appear for 2 seconds and the alert
disappears automatically.
Table 2-2
Info Alert
Info Alert
Description
This alert appears during the edit mode and the edited parameter value blinks
on the LCD. After 15 s of inactivity time, the edited value of the parameter will
be discarded.
This alert appears when the fault flags are reset and LED test is performed.
This alert appears when the fault flags are reset.
This alert appears when reset of the fault flag is failed due to the presence of
fault current and the fault persists.
This alert appears when reset of the fault flag is failed due to the presence of
fault current and the fault/maint persists.
This alert appears when the user connects to the USB host.
Enter the password twice for confirmation or changing a password. This alert
message appears when the password does not match with the previously
typed password.
This alert appears when the password entered by the user contains any
special characters other than “+” and “-“or “/” when changing the password.
This alert appears when the user selects to clear the fault or event records
and the operation is successful.
©2018 Siemens Protection Devices
Chapter 1 Page 22 of 48
Chapter 1 - 7SR45 Description of Operation
This alert appears when the relay is powered on in the battery mode.
This alert appears when the relay goes to sleep mode.
This alert appears when there is insufficient energy to perform the following
actions:
•
Turn on backlight
•
To operate or reset the binary outputs
This alert appears when the user selects to clear the fault records without
acknowledging the latest fault by resetting the flag.
This alert appears when the relay is powered by phase CT.
This alert appears when the relay is powered by auxiliary power supply.
2.11 Parameter Edit Screen
7SR45 Argus Relay allows the user to edit the parameter value in the LCD.
To edit any parameter, follow the procedure:
1.
From the Relay Identifier screen, navigate to the Parameter screen.
2.
In the Parameter screen, press ENTER key to display the edit screen.
3.
In the Edit Screen, the user can edit the parameter value in the editable field.
4.
Press ▲ key and ▼key to select the valid value.
5.
Press ENTER to save the parameter value.
To discard the parameter value, press the CANCEL key.
6.
Press CANCEL until the Save and Restart pop-up screen is displayed.
7.
Press ENTER to save the configuration in memory.
©2018 Siemens Protection Devices
Chapter 1 Page 23 of 48
Chapter 1 - 7SR45 Description of Operation
Section 3: Protection Functions (50, 51, 50N, 51N, 50G,
51G, 50LC)
3.1
Instantaneous Overcurrent Protection (50)
Two Instantaneous overcurrent elements are provided in the 7SR45 Argus Relay.
50-1, 50-2
Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and
50-n Delay definite time delay.
Operation of the instantaneous overcurrent elements can be inhibited by assigning binary inputs.
Inhibit 50-n
A binary input.
Gn 50-n
Enabled
Disabled
&
Inhibit 50-n
Gn 50-n Setting
c
>
≥1
General Pickup
≥1
50-n
Gn 50-n Delay
>
>
Gn 50/51
Measurement
IL1
IL2
IL3
Figure 3-1
Table 3-1
Logic Diagram: Instantaneous Overcurrent Element
Instantaneous Overcurrent Protection (50-n)
Parameters
Description
Default Value
Min
Max
Step Change
Gn 50-n Element
50-n Block
Disabled
-
-
-
Gn 50-n Setting
Pick-up current
1
0.2xIn
20xIn
0.1
0s
<20 s
0.01
Gn 50-n Delay
Delay time
0
≥20 s
<100 s
0.1
≥100 s
600 s
1
NOTE:
In a single-phase condition, it is recommended to use 50-n Setting 0.3xIn or higher.
©2018 Siemens Protection Devices
Chapter 1 Page 24 of 48
Chapter 1 - 7SR45 Description of Operation
3.2
Time Delayed Overcurrent Protection (51)
One time delayed overcurrent element is provided in the 7SR45 Argus Relay.
51-1
51-n Setting sets the pick-up current level.
A total of 7 shaped characteristics are provided from IEC and ANSI standards. An inverse definite minimum time
(IDMT) characteristic is selected using 51-n Char. A time multiplier is applied to the characteristic curves using
the 51-n Time Mult setting. Alternatively, a Definite Time Lag (DTL) can be chosen using 51-n Char. When
Definite Time Lag (DTL) is selected the time multiplier is not applied and the 51-n Delay (DTL) setting is used
instead.
The 51-n Reset setting can apply a definite time delayed reset or when the operation is configured as an IEC or
ANSI and if the reset is selected as (IEC/ANSI) DECAY reset, the associated reset curve will be used.
A minimum operate time for the characteristic can be set using 51-n MinOperate setting.
A fixed additional operate time can be added to the characteristic using 51-n Follower setting.
Operation of the time delayed overcurrent elements can be inhibited by assigning binary inputs.
Inhibit 51-n
A binary input.
Gn 51-n Element
Gn 51-n Setting
Enabled
Gn 51-n Char
Disabled
&
Gn 51-n Time Mult
Gn 51-n Delay (DTL)
Inhibit 51-n
Gn 51-n MinOperate
Gn 51-n Follower
Gn 51-n Reset
c
c
Pickup
trip
c
≥1
General Pickup
≥1
51-n
Pickup
trip
c
Pickup
trip
Gn 50/51
Measurement
IL1
IL2
IL3
Figure 3-2
©2018 Siemens Protection Devices
Logic Diagram: Time Delayed Overcurrent Element
Chapter 1 Page 25 of 48
Chapter 1 - 7SR45 Description of Operation
The following are the 51-n supported Curve Characteristic:
•
DTL, IEC-NI, IEC-VI, IEC-EI, IEC-LTI, ANSI-MI, ANSI-VI, ANSI-EI
Operating time for IEC :
Operating time for IEEE/ANSI :
top =
top=
Reset time for IEC/IEEE/ANSI
:
K
I α
( Is )
A
I P
( Is )
1
X Tm
+B
1
X Tm
R
tr =
Table 3-2
n X Tm
( IsI )
1
Constants for operating and reset curve characteristics
Operating time
Curve type
Reset time
K
α
P
A
B
R
n
IEC-NI
0.14
0.02
----
----
----
9.7
2
IEC-VI
13.5
1.0
----
----
----
43.2
2
IEC-EI
80
2.0
----
----
----
58.2
2
IEC-LTI
120
1.0
----
----
----
80
2
IEEE/ANSI - MI
----
----
0.02
0.0515
0.114
4.85
2
IEEE/ANSI - VI
----
----
2.0
19.61
0.491
21.6
2
IEEE/ANSI - EI
----
----
2.0
28.2
0.1217
29.1
2
Where,
I - Fault current Magnitude
Is - Pickup setting
Tm - Time multiplier
Table 3-3
Parameters
Time Delayed Overcurrent Protection (51-n)
Description
Default Value
Min
Max
Step Change
Gn 51-n Element
51-1 Block
Disabled
-
-
-
Gn 51-n Setting
Pick-up current
1xIn
0.2xIn
2.0xIn
0.01
Gn 51-n Char
Characteristics
IEC NI
-
-
-
Gn 51-n Time Mult
Time Multiplier
(other than DTL)
1
0.01 s
10
0.01
Gn 51-n Delay
Delay
(Applicable only
for DTL)
5s
0s
15 s
0.01
Gn 51-n Min
Operate
Minimum Operate
Time
0s
0s
20 s
0.01
Gn 51-n Follower
Follower DTL
0s
0s
20 s
0.01
Gn 51-n Reset
Reset
0s
0s
60, IEC/
ANSI
DECAY
1
©2018 Siemens Protection Devices
Chapter 1 Page 26 of 48
Chapter 1 - 7SR45 Description of Operation
3.3
Instantaneous Derived Earth Fault Protection (50N)
Two instantaneous derived earth fault elements are provided in the 7SR45 Argus Relay.
50N-1, 50N-2
Earth current is derived by calculating the vector sum of the measured phase currents.
Each instantaneous element has independent settings for pick-up current 50N-n Setting and a definite time delay
50N-n Delay.
Operation of the instantaneous derived earth fault elements can be inhibited by assigning binary inputs.
Inhibit 50N-n
A binary input.
Gn 50N- n Element
Disabled
Enabled
&
Inhibit 50N-n
General Pickup
Gn 50 N -n Setting
Gn 50N - n Delay
c
IL1
IL2
∑
IN
>
50N-n
IL3
Figure 3-3
Logic Diagram: Instantaneous Derived Earth Fault Element
Table 3-4
Instantaneous Derived Earth Fault Protection (50N-n)
Parameters
Description
Default Value
Min
Max
Step Change
Gn 50N-n Element
50N-n Block
Disabled
-
-
-
Gn 50N-n Setting
Pick-up current
1xIn
0.2xIn
20xIn
0.1
0s
<20 s
0.01
≥20 s
<100 s
0.1
≥100 s
600 s
1
Gn 50N-n Delay
Delay time
©2018 Siemens Protection Devices
0
Chapter 1 Page 27 of 48
Chapter 1 - 7SR45 Description of Operation
3.4
Time Delayed Derived Earth Fault Protection (51N)
One time delayed derived earth fault element is provided in the 7SR45 Argus Relay.
51N-1
51N-n Setting sets the pick-up current level.
A total of 7 shaped characteristics are provided from IEC and ANSI. An inverse definite minimum time (IDMT)
characteristic is selected using 51N-n Char. A time multiplier is applied to the characteristic curves using the
51N-n Time Mult setting. Alternatively, a Definite Time Lag (DTL) can be chosen using 51N-n Char. When
Definite Time Lag (DTL) is selected the time multiplier is not applied and the 51N-n Delay (DTL) setting is used
instead.
The 51N-n Reset setting can apply a definite time delayed reset or when the operation is configured as an IEC
or ANSI if the reset is selected as IEC/ANSI (DECAY) reset, the associated reset curve will be used.
A minimum operate time for the characteristic can be set using the 51N-n MinOperate setting.
A fixed additional operate time can be added to the characteristic using the 51N-n Follower setting.
Operation of the time delayed derived earth fault elements can be inhibited by assigning binary inputs.
Inhibit 51N-n
A binary input.
Gn 51N - n Element
Disabled
Enabled
&
Gn 51N - n Setting
Gn 51N - n Char
Inhibit 51N-n
Gn 51N - n Time Mult
Gn 51N - n Delay (DTL)
Gn 51N - n MinOperate
Gn 51N- n Follower
'
Gn 51N - n Reset
c
IL1
IN
∑
IL2
Pickup
trip
General Pickup
51N- n
IL 3
Figure 3-4
Logic Diagram: Time Delayed Derived Earth Fault Protection
The following are the 51N-n supported curve characteristic:
•
DTL, IEC-NI, IEC-VI, IEC-EI, IEC-LTI, ANSI-MI, ANSI-VI, ANSI-EI
Operating time for IEC : top =
Operating time for IEEE/ANSI : top=
K
I α
( Is )
A
I P
( Is )
1
X Tm
+B
1
X Tm
R
Reset time for IEC/IEEE/ANSI :
©2018 Siemens Protection Devices
tr =
1
n X Tm
( IsI )
Chapter 1 Page 28 of 48
Chapter 1 - 7SR45 Description of Operation
Table 3-5
Constants for operating and reset curve characteristics
Operating time
Curve type
Reset time
K
α
P
A
B
R
n
IEC-NI
0.14
0.02
----
----
----
9.7
2
IEC-VI
13.5
1.0
----
----
----
43.2
2
IEC-EI
80
2.0
----
----
----
58.2
2
IEC-LTI
120
1.0
----
----
----
80
2
IEEE/ANSI - MI
----
----
0.02
0.0515
0.114
4.85
2
IEEE/ANSI - VI
----
----
2.0
19.61
0.491
21.6
2
IEEE/ANSI - EI
----
----
2.0
28.2
0.1217
29.1
2
Where,
I - Fault current Magnitude
Is - Pickup setting
Tm - Time multiplier
Table 3-6
Time Delayed Derived Earth Fault Protection (51N-n)
Parameters
Description
Default
Value
Min
Max
Step Change
Gn 51N-n Element
51N-n Block
Disabled
-
-
-
Gn 51N-n Setting
Pick-up current
0.5xIn
0.1xIn
0.8xIn
0.01
Gn 51N-n Char
Characteristics
IEC NI
-
-
-
Gn 51N-n Time
Mult
Time Multiplier
(other than DTL)
1
0.01
10
0.01
Gn 51N-n Delay
Delay
(Applicable only for
DTL)
5s
0s
15 s
0.01
Gn 51N-n Min
Operate
Minimum Operate
Time
0s
0s
20 s
0.01
Gn 51N-n
Follower DTL
Follower DTL
0s
0s
20 s
0.01
Gn 51N-n Reset
Reset
0s
0s
60, IEC/
ANSI
DECAY
1
©2018 Siemens Protection Devices
Chapter 1 Page 29 of 48
Chapter 1 - 7SR45 Description of Operation
3.5
Instantaneous Measured Earth Fault Protection (50G)
The earth current is measured directly via a dedicated current analogue input, IL4/IE.
Two instantaneous measured earth fault elements are provided in the 7SR45 Argus Relay.
50G-1, 50G-2
Each instantaneous element has independent settings for pick-up current 50G-n Setting and a definite time delay
50G-n Delay.
Operation of the instantaneous measured earth fault elements can be inhibited by assigning binary inputs.
Inhibit 50G-n
A binary input
Gn 50G- n Element
Disabled
Enabled
&
Inhibit 50 G- n
General Pickup
Gn 50G- n Setting
Gn 50 G - n Delay
c
51G/50G Measurement
IG
Figure 3-5
Table 3-7
>
50 G - n
Logic Diagram: Instantaneous Measured Earth-fault Element
Instantaneous Measured Earth Fault Protection (50G-n)
Parameters
Description
Default Value
Min
Max
Step Change
Gn 50G-n
Element
50G-n Block
Disabled
-
-
-
Gn 50G-n Setting
Pick-up current
0.2xIn
Gn 50G-n Delay
Delay time
©2018 Siemens Protection Devices
0
1xIn
20xIn
0.1
0s
<20 s
0.01
≥20 s
<100 s
0.1
≥100 s
600 s
1
Chapter 1 Page 30 of 48
Chapter 1 - 7SR45 Description of Operation
3.6
Time Delayed Measured Earth Fault Protection (51G)
One time delayed measured earth fault element is provided in the 7SR45 Argus Relay.
51G-1
51G-n Setting sets the pick-up current level.
A total of 7 shaped characteristics are provided from IEC and ANSI. An inverse definite minimum time (IDMT)
characteristic is selected using 51G-n Char. A time multiplier is applied to the characteristic curves using the
51G-n Time Mult setting. Alternatively, a Definite Time Lag (DTL) can be chosen using 51G-n Char.
When DTL is selected the time multiplier is not applied and the 51G-n Delay (DTL) setting is used instead.
The 51G-n Reset setting can apply a definite time delayed reset, or when the operation is configured as an IEC
or ANSI if the reset is selected as IEC/ANSI (DECAY), reset the associated reset curve will be used. The reset
mode is significant where the characteristic has reset before issuing a trip output.
A minimum operate time for the characteristic can be set using 51G-n MinOperate setting.
A fixed additional operate time can be added to the characteristic using 51G-n Follower setting.
Operation of the time delayed measured earth fault elements can be inhibited by assigning binary inputs.
Inhibit 51G-n
A binary input.
Gn 51G- n Element
Disabled
Enabled
&
Inhibit 51G-n
Gn 51G- n Setting
Gn 51G-n Char
Gn 51G- n Time Mult
Gn 51G-n Delay (DTL )
Gn 51G- n MinOperate
Gn 51G- n Foll’ ower
Gn 51G- n Reset
Gn 51G /50G Measurement
c
Pickup
IG
trip
Figure 3-6
General Pickup
51 G - n
Logic Diagram: Time Delayed Measured Earth Fault Element
The following are the 51G-n supported Curve Characteristic:
•
DTL, IEC-NI, IEC-VI, IEC-EI, IEC-LTI, ANSI-MI, ANSI-VI, ANSI-EI
Operating time for IEC : top =
Operating time for IEEE/ANSI : top=
K
I α
( Is )
A
I P
( Is )
1
X Tm
+B
1
X Tm
R
Reset time for IEC/IEEE/ANSI :
©2018 Siemens Protection Devices
tr =
1
n X Tm
( IsI )
Chapter 1 Page 31 of 48
Chapter 1 - 7SR45 Description of Operation
Table 3-8
Constants for operating and reset curve characteristics
Operating time
Curve type
Reset time
K
α
P
A
B
R
n
IEC-NI
0.14
0.02
----
----
----
9.7
2
IEC-VI
13.5
1.0
----
----
----
43.2
2
IEC-EI
80
2.0
----
----
----
58.2
2
IEC-LTI
120
1.0
----
----
----
80
2
IEEE/ANSI - MI
----
----
0.02
0.0515
0.114
4.85
2
IEEE/ANSI - VI
----
----
2.0
19.61
0.491
21.6
2
IEEE/ANSI - EI
----
----
2.0
28.2
0.1217
29.1
2
Where,
I - Fault current Magnitude
Is - Pickup setting
Tm - Time multiplier
Table 3-9
Time Delayed Measured Earth Fault Protection (51G-n)
Parameters
Description
Default Value
Min
Max
Step Change
Gn 51G-n
Element
51G-1 Block
Disabled
-
-
-
Gn 51G-n
Setting
Pick-up current
0.5xIn
0.1xIn
0.80xIn
0.01
Gn 51G-n Char
Characteristics
IEC NI
-
-
-
Gn 51G-n Time
Mult
Time Multiplier
(other than DTL)
1
0.01
10
0.01
Gn 51G-n Delay
Delay
(Applicable only for
DTL)
5s
0s
15 s
0.01
Gn 51G-n Min
Operate
Minimum Operate
Time
0s
0s
20 s
0.01
Gn 51G-n
Follower DTL
Follower DTL
0s
0s
20 s
0.01
Gn 51G-n Reset
Reset
0s
0s
60, IEC/
ANSI
DECAY
0.01
©2018 Siemens Protection Devices
Chapter 1 Page 32 of 48
Chapter 1 - 7SR45 Description of Operation
3.7
Switch-On-To-Fault (50LC/SOTF)
SOTF provides high-speed tripping in the event of energizing the feeder while the earth switch is closed or while
the feeder is energized when the fault current/short circuit current persists.
SOTF function monitors the phase current for a maximum duration of 25 AC cycles from the CT interrupt and trips
when any fault is detected as per the user settings. After the 25 AC cycles, SOTF function would be inhibited
automatically.
SOTF can be inhibited by assigning binary input.
Operation of the Switch-On-To-Fault elements can be inhibited from:
Inhibit 50LC
A binary input
Gn 50 LC / SOTF
Enabled
Disabled
&
Gn 50 LC Setting
Inhibit 50LC
c
≥1
General Pickup
≥1
50 LC
>
>
>
Gn 50 LC / SOTF
Measurement
IL1
IL2
IL3
25 AC cycles
Figure 3-7
Logic Diagram: 50LC Overcurrent Element
Table 3-10
50LC/SOTF
Parameters
Description
Default Value
Min
Max
Step Change
Gn 50LC/SOTF
Setting
Pick-up current
2xIn
1xIn
20xIn
1
©2018 Siemens Protection Devices
Chapter 1 Page 33 of 48
Chapter 1 - 7SR45 Description of Operation
The following graphs show the SOTF operating time for the CT power only.
Figure 3-8
Operating Time for Single Phase Fault with Binary Output
Figure 3-9
Operating Time for Single Phase Fault with Pulse Output
NOTE:
The multi-phase faults results to a shorter operating time.
Under the low battery or battery drained condition, the boot up time is increased by maximum of 25 ms.
©2018 Siemens Protection Devices
Chapter 1 Page 34 of 48
Chapter 1 - 7SR45 Description of Operation
3.8
General Alarm
General Alarms are the user defined text messages displayed on the LCD when binary inputs are mapped and
triggered.
Up to 4 general alarms of 16 characters can be configured, each triggered from one or more input. Each general
alarm generates an event.
If multiple alarms are activated simultaneously, the last alarm indication is displayed on the LCD.
All the fault triggers generated by general alarms are logged in to the fault data record.
Table 3-11
General Alarm
Parameters
Description
Range
Default
Value
Min
Max
Step
Change
General
Alarm-n
General Alarm-n
16 char (0-9, A-Z, +, -, /, SPACE)
Alarm-n
-
-
-
3.9
Reset LED, Trip Flag Indication and Binary Outputs
Depending upon any binary output configuration set by the user to operate the protection function, if the
protection functions detect any fault, binary output(s), local and remote trip flag indications, trip and respective
phase or earth LEDs operate and latch.
By using the RESET flag functionality, the user can reset binary outputs, LEDs, local trip flag indication.
The user can reset binary output/LEDs in any one of the following methods:
• Binary Input
• Reydisp Software
• TEST/RESET► key
• Reset via Rear Communication Protocol
After successful reset of binary outputs, local flags, and LEDs, the “FLAGS RESET” message appears on LCD
and all the LEDs flashes and reset.
In the CT power mode, LED test can be performed if the current is more than 0.4xIn (single phase) or
0.14xIn (three phase).
If the fault current persists, pop-up message appears on the LCD “FAULT PERSISTS”.
©2018 Siemens Protection Devices
Chapter 1 Page 35 of 48
Chapter 1 - 7SR45 Description of Operation
3.9.1
Reset through Binary Input
In the INPUT MATRIX configuration, LEDs and outputs can be reset by configuring the binary input. The
configuration can be executed with ReyDisp Evolution or Human Machine Interface (HMI).
Figure 3-10
Reset LEDs Outputs: Reydisp Software Input Matrix
3.9.2
Reset using Reydisp Software
When the relay is latched, LEDs can be reset by sending an appropriate command over the data communications
channels using Reydisp software.
Figure 3-11
Reset Flags
In the Reydisp Evolution screen, navigate to Relay > Control and click Reset Flags.
3.9.3
TEST/RESET► Key
3.9.4
Reset through rear communication protocol
From the Relay Identifier Screen, reset the LEDs and outputs by pressing the TEST/RESET► key.
The resetting of LEDs and BOs can be possible via the rear communication protocol like Modbus and
IEC 60870-5-103.
©2018 Siemens Protection Devices
Chapter 1 Page 36 of 48
Chapter 1 - 7SR45 Description of Operation
3.10 Current Inputs
The 7SR45 Argus Relay consists of 4 current inputs. The 3 current inputs are provided for measuring the phase
currents and 1 current input is provided for measuring the ground current.
Based on the ordering option, current inputs are available for 1A and 5A variants.
The 7SR45 Argus Relay consists of 1 built-in Power Current Transformer (PCT) and 1 built-in Measuring Current
Transformer (MCT) for each phase current input. 1 MCT is provided on the ground-current input.
The current is sampled at 800Hz for both 50Hz and 60Hz system frequency. Protection and monitoring functions
of the relay use the fundamental frequency component to calculate the RMS value of current.
The primary CT ratio used for the relay instruments and fault logs can be set in the CT/VT configuration menu.
3.11 Binary Inputs
The binary inputs (BI) are opto-couplers operated from a suitably rated AC/DC power supply.
The device variants with binary inputs having an 88V threshold can be operated using an AC/DC source and the
19 V threshold can be operated with DC source only.
The status of BI can be viewed via LCD or Reydisp Evolution software or SCADA.
The 7SR45 Argus Relays are available with 2 or 4 binary inputs. The user can assign any binary input to any of
the available functions such as inhibits, binary outputs, reset flags, and general alarms (INPUT CONFIG > INPUT
MATRIX). Binary input can also be mapped to operate the pulse output in the presence of auxiliary power
supply/CT input.
Pick-up (PU) and drop-off (DO) time delays are associated with each binary input. Where no pick-up time delay
has been applied the input may pick up due to induced AC voltage on the wiring connections (For example, cross
site wiring). The default pick-up time of 20 ms provides AC immunity. Each input can be configured
independently.
Each input can be logically inverted to facilitate integration of the relay within the user scheme. When inverted the
relay indicates that the BI is triggered when no binary input voltage is applied. Inversion occurs before the PU &
DO time delay.
Binary inputs can be configured for instantaneous operation from 19V DC power supply by setting of
0 ms PU and 25 ms DO timers.
Each binary input can be assigned to any binary output. This allows the relay to provide panel indications and
alarms.
Inverted Inputs
BI 1 P/U Delay
BI 1 inverted
BI 1 D/O Delay
BI 1
Event
=1
Binary Input 1
INPUT
CONFIG>
BINARY
INPUT
CONFIG
INPUT CONFIG>
INPUT MATRIX
(OR gates)
BI n P/U Delay
BI n inverted
Binary Input n
BI n D/O Delay
BI n
Event
=1
Logic signals,
e.g. 'Inhibit 51-1'
Figure 3-12
©2018 Siemens Protection Devices
Binary Input Logic
Chapter 1 Page 37 of 48
Chapter 1 - 7SR45 Description of Operation
Table 3-12
Binary Input
Parameters
Description
Default Value
Min
Max
Step Change
Inhibit 50-1
50-1 element block
-
-
1
-
Inhibit 50-2
50-2 element block
-
-
1
-
Inhibit 51-1
51-1 element block
-
-
1
-
Inhibit 50N-1
50N-1 element block
-
-
1
-
Inhibit 50N-2
50N-2 element block
-
-
1
-
Inhibit 51N-1
51N-1 element block
-
-
1
-
Inhibit 50G-1
50G-1 element block
-
-
1
-
Inhibit 50G-2
50G-2 element block
-
-
1
-
Inhibit 51G-1
51G-1 element block
-
-
1
-
Inhibit 50LC
50LC/SOTF element block
-
-
1
-
Select Group 1 #
Select Group 1
-
-
1
-
#
Select Group 2
-
-
1
-
Rst LEDs & O/Ps
Reset LEDs and BOs
-
-
1
-
Trip Pulse O/P
Pulse output
-
-
1
-
Local mode #
Local mode
-
-
1
-
Remote mode
-
-
1
-
Select Group 2
#
Remote mode
Local or Remote mode
#
Local or Remote mode
-
-
1
-
Out Of Service mode
-
-
1
-
General Alarm-1
Display General alarm-1 text
-
-
1
-
General Alarm-2
Display General alarm-2 text
-
-
1
-
General Alarm-3 *
Display General alarm-3 text
-
-
1
-
General Alarm-4 *
Display General alarm-4 text
-
-
1
-
Out Of Service mode
#
NOTE:
* For 7SR4501 variants, these parameters are not available.
#
For 7SR4501-xGA10-1AA0 variant, these parameters are not available.
Table 3-13
Binary Input Configuration
Parameters
Description
Default Value
Min
Max
Step Change
Inverted Inputs
Input Inversion
-
-
1
-
0s
<20 s
0.01
BI-n Pickup
Pickup delay
0.020
≥20 s
<100 s
0.1
≥100 s
600 s
1
0s
<20 s
0.01
≥20 s
<100 s
0.1
≥100 s
600 s
1
BI-n dropoff
Dropoff delay
0.000
Enabled in Local
Enabled in Local mode
1 (all BIs)
-
1
-
Enabled in Remote
Enabled in Remote mode
1 (all BIs)
-
1
-
NOTE:
Depending on the number of binary inputs, the sleep mode current will increase if the binary input is connected
and energized in the sleep mode.
NOTE:
When any binary input is assigned to Trip Pulse Output and when the TEST/RESET key is pressed, a
“FAULT/ MAINT PERSISTS” pop up appears.
©2018 Siemens Protection Devices
Chapter 1 Page 38 of 48
Chapter 1 - 7SR45 Description of Operation
3.12 Binary Outputs
The 7SR45 Argus Relay consists of 2 or 4 binary output which can be configured to send commands to the
switchgear units and annunciations for remote signalling of the important events and status.
3.12.1
Binary Output Matrix
Binary output can be assigned to any available functions under OUTPUT CONFIG > OUTPUT MATRIX menu.
3.12.2
Binary Output Configuration
In the default mode of operation, binary outputs are self reset and remain energised until the triggering condition
exists. If required, the binary outputs can be programmed to operate as ‘hand reset’.
NOTE:
The binary output 1 and binary output 2 only can be configured as hand reset. The binary output 3 and binary
output 4 are always of self reset type. The minimum operating time is 20 milliseconds.
For 7SR4501-xGA10-1AA0
Self Reset/Hand Reset
In the default operating mode, binary outputs are self reset. If required, the outputs can be programmed to
operate as ‘hand reset’. However, the hand reset functionality is applicable for protection trip signals, IRF signal,
and BI signals only.
All the supervisory signals such as low battery, general pick up, and protection healthy are always of self reset
type.
By default, the Binary Output 1 is mapped to IRF function and programmed as 'hand reset". In the self reset
condition, binary output resets if the input current drops below the sensitivity levels.
NOTE:
In the absence of auxiliary voltage, the binary output 3 and binary output 4 will not be functional and remain in
the non-operated condition.
Logic signals,
e.g. '51-1'
Reset LEDs & Outputs (TEST/RESET key, Binary Input, Data Comms)
BO 1
S
R
Hand Reset
≥1
Min Operate Time
OUTPUT CONFIG>
OUTPUT MATRIX
Event
&
&
BO 1 hand reset
Output 1
Q
&
≥1
(Or gates)
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
BO n
S
&
BO n hand reset
©2018 Siemens Protection Devices
R
≥1
≥1
Figure 3-13
&
Output n
Q
&
Binary Output Logic
Chapter 1 Page 39 of 48
Event
Chapter 1 - 7SR45 Description of Operation
Table 3-14
Binary Output
Parameters
Description
Default Value
Min
Max
Step
Change
50-1
50-1 element operate
-
-
1
-
50-2
50-2 element operate
-
-
1
-
51-1
51-1 element operate
-
-
1
-
50N-1
50N-1 element operate
-
-
1
-
50N-2
50N-2 element operate
-
-
1
-
51N-1
51N-1 element operate
-
-
1
-
50G-1
50G-1 element operate
-
-
1
-
50G-2
50G-2 element operate
-
-
1
-
51G-1
51G-1 element operate
-
-
1
-
50LC
50LC/SOTF element operate
-
-
1
-
Active Grp 1
#
Active Group 1
-
-
1
-
Active Grp 2
#
Active Group 2
-
-
1
-
General Pickup
Pickup detected
-
-
1
-
Prot'n Healthy
Protection Healthy
-
-
1
-
Low Battery
Battery Volts low indication
-
-
1
-
Internal Relay Failure
1 (BO1), - (Others)
-
1
-
Local mode
-
-
1
-
Remote mode
-
-
1
-
Out of Service mode
-
-
1
-
BI-1 operated
-
-
1
-
IRF
Local mode
#
Remote mode
#
Out of Service mode
BI1 Operated
BI2 Operated
#
BI-2 operated
-
-
1
-
BI3 Operated
#
BI-3 operated
-
-
1
-
BI4 Operated
#
BI-4 operated
-
-
1
-
NOTE:
#
For 7SR4501-xGA10-1AA0 variant, these parameters are not available.
NOTE:
If a binary output is assigned to IRF, then do not use the same binary output for any other functions.
3.13 Binary Output Operations
The relay reset can be performed from the Relay Identifier Screen > TEST/RESET► key.
If the fault current persists and if the user presses TEST/RESET► key, the pop-up message appears,
“FAULT PERSISTS”.
Based on the availability of power source, the flag can be reset by using any one of the following conditions:
3.13.1
BO Trip/Reset on Battery/USB
In this mode, the relay uses the power from battery/USB to operate/reset the binary output and takes
approximately 4s to perform the action.
If the consecutive commands are provided within 4 seconds, the relay performs delayed operations and displays
a pop-up message appears on the HMI “INSUFFICIENT ENERGY”.
3.13.2
BO Trip/Reset on CT Input or Auxiliary Voltage
In this mode, the relay can operate/reset the binary outputs instantaneously.
©2018 Siemens Protection Devices
Chapter 1 Page 40 of 48
Chapter 1 - 7SR45 Description of Operation
3.14 Pulse Output
The pulse output is used to interface directly with the low energy circuit breaker tripping coil. The pulse output
provides 24 V, 0.1 Ws pulses of 50 ms ON and 500 ms OFF.
The pulse output operates when any configured protection function trips. The trip energy for the trip coil is stored
by a capacitor built into the protection relay. The capacitors are charged by the auxiliary power supply/phase
current. The pulses are repeated until the fault current falls below the set value. The pulse output does not require
any mapping with protection functions.
In the presence of auxiliary power supply/phase current, pulse output can be operated by mapping to a binary
input. When the assigned binary input is triggered, the pulse output operates, local flag operates, and Trip LED
flashes. Pulse output is provided till the auxiliary power supply/phase current is available.
NOTE:
The time between the two pulses depends on the impedance of the trip coil and magnitude of the current (if the
relay is powered through phase currents).
When there is NO LOAD connected at the output of Pulse Output (NO TRIP coil is connected), the PULSE ON
duration may vary from 50 ms to 70 ms.
Pulse output cannot be triggered through Rear/Front communication protocols, it is recommended to use BIs for
triggering the pulse output for remote trip applications.
3.15 Remote Flag Output
The remote flag output is used to indicate the trip via an external flag. The remote flag output provides 24 V,
0.01 Ws pulses of 50 ms ON and 500 ms OFF.
The remote flag output operates when any protection function trips. The energy is stored by a capacitor built into
the protection relay. The capacitor is charged by auxiliary voltage or phase current. The pulses are repeated until
the fault current falls below the set value. The remote flag output does not require any mapping with protection
functions.
NOTE:
The time between the two pulses depends on the impedance of the flag indicator and on the current level (if the
relay is powered by auxiliary power/phase current).
3.16 Modes of Operation
The 7SR45 Argus Relay can be powered on by using the following sources:
•
Auxiliary Voltage Inputs
•
CT Input
•
USB
•
Battery
The 7SR45 Argus Relay is powered primarily from auxiliary voltage even if all other power sources are available.
In the absence of auxiliary voltage, the relay is powered through phase currents.
In the absence of both auxiliary voltage and phase currents, the relay can be powered on by USB or battery.
The relay can be powered on by the battery only if all other power sources are not available.
3.16.1 Auxiliary Voltage
All the protection and measurement algorithms and RS485 communication (Rear port) are active when the 7SR45
Argus Relay is powered by auxiliary voltage.
NOTE:
In the absence of auxiliary voltage, the binary output 3 and binary output 4 will not be functional and remain in the
non-operated conditions.
3.16.2 CT Input
In the absence of auxiliary voltage, all the protection and measurement algorithms are active when the 7SR45
Argus Relay is powered through phase CTs, however the RS485 communication stops working.
3.16.2.1 Sensitivity
In the absence of auxiliary voltage, the sensitivity of the relay is the minimum phase current required for the relay
to energize, detect a fault, and trip as per the configuration.
©2018 Siemens Protection Devices
Chapter 1 Page 41 of 48
Chapter 1 - 7SR45 Description of Operation
The sensitivity of 7SR45 Argus Relay is 0.20xIn (minimum phase current) in single phase or 0.13xIn (minimum
phase current) in three phase. This minimum phase current is necessary for the healthy functioning of the relay.
The PROTECTION HEALTHY and TRIP READY LEDs indicates the healthiness of the relay.
The following graphs show the sensitivity of the relay and the corresponding operating time for the different
start up currents.
Figure 3-14
Sensitivity for Single Phase Fault with Binary Output
Figure 3-15
Sensitivity for Single Phase Fault with Pulse Output
NOTE:
The multi-phase current will improve the sensitivity.
©2018 Siemens Protection Devices
Chapter 1 Page 42 of 48
Chapter 1 - 7SR45 Description of Operation
3.16.2.2 Time Delayed Overcurrent Protection during Start up (51, 51G, 51N)
The operating time of the protection functions (51, 51G, 51N) are optimized at the lower current settings when the
relay is energized with the short-circuit current or fault current.
The optimization of the operating time is done only in the start up condition for the first 25 AC cycles if the fault
current persists.
The optimization is done as per the sensitivity characteristics of the binary output. However, the operating time of
the pulse output also improves if the calculated operating time is less than the pulse output sensitivity
characteristics.
NOTE:
The following conditions must be considered for the optimization algorithm:
1. If the calculated operating time is less than the boot up time as shown in the sensitivity graph (Figure 3-14,
Figure 3-16), then the optimization is not effective.
2. If the battery is low, the calculated boot up time is increased, the optimization is not effective.
3. When the device is started with the load current and the fault current appears within 25 AC cycles, then the
operating time will be less than the calculated time.
4. It is recommended to keep the Time Multiplier setting to more than 0.1.
5. The optimization of the operating time is not effective if the fault current is not stable during the boot up time.
3.16.3 USB
In the USB mode, all the settings can be edited even if the protection functions are inactive. The binary inputs and
binary outputs are operational in the USB mode. In the USB mode, the local flag indicator reset is only possible.
The pulse output and remote flag output cannot be operated with USB.
3.16.4 Battery
In the battery mode, the relay can be energized by pressing the BAT ON/OFF key or if any binary input status is
changed.
The battery is used to operate 7SR45 Argus Relay only when other power sources are not available.
In the battery mode, all the settings can be edited even if the protection functions are inactive. The binary inputs
and binary outputs are operational in the battery mode. In the battery mode, the local flag indicator reset is only
possible. The pulse output and remote flag output cannot be operated with battery.
In the battery mode, if no keys are pressed for 60 s, the relay goes to sleep mode automatically.
By default, in the battery mode, the backlight is OFF and it can be TURNED ON by pressing the backlight key.
3.16.4.1 Battery Profile
The Battery Profile menu provides the consumption on battery power of the different application modules.
The table 3-15 shows the battery profile parameter data and the status of the operations performed on the battery
power.
Table 3-15
Battery Profile Parameter
Battery Profile Parameter
Description
Unit
Device ON Dur’n
The duration of the device powered on with the battery source only.
Seconds
Backlit ON Dur’n
The duration of the LCD backlight powered on with the battery source
only.
Seconds
BO Oper’n Count
The number of times the binary outputs operate with the battery
source only.
-
BI Oper’n Count
The number of times the binary inputs operate with the battery source
only.
-
The battery profile parameters data can be cleared with the DATA STORAGE > Clr Battery Data setting in HMI.
NOTE:
When replacing the new battery, the battery profile parameters data must be cleared.
©2018 Siemens Protection Devices
Chapter 1 Page 43 of 48
Chapter 1 - 7SR45 Description of Operation
3.16.5 Sleep Mode
The 7SR45 Argus Relay goes to the sleep mode when the auxiliary power/CT power and USB power are not
available. When the relay is in sleep mode, the user can access the LCD by pressing the BAT ON/OFF key.
In case of inactivity, the relay goes to the sleep mode after 60 s.
When the relay is powered by CT and no auxiliary power and any fault on the system occurs, the relay goes to
sleep mode automatically if the phase CT currents are disconnected.
When the device powered ON through USB power mode and once the USB cable is removed, the device goes to
sleep mode automatically.
NOTE:
During the sleep mode, the 7SR45 Argus Relay has the limited functionality.
3.16.6 Low Battery Status Indication
The low battery LED indication is displayed when the battery voltage falls below the sufficient operating voltage
and an event is generated. In the low battery condition only setting view/edit is allowed.
In the low battery mode, the backlight will not TURN ON.
The low battery can be mapped to a binary output and can be used for remote signalling.
NOTE:
It is recommended to replace the battery when the low battery indication is displayed.
Some of the relay operations such as turning on the backlight and resetting local flag, binary outputs and LEDs in
the low battery mode will lead to insufficient operating voltage. The LCD displays "INSUFFICIENT ENERGY"
message and the relay enters sleep mode.
NOTE:
During the low battery, if the battery voltage reduces below 1.5V while doing the setting changes, the device will
enter sleep mode and all unsaved setting changes will be discarded.
NOTE (For selected variants only):
When the battery voltage has dropped below 1.5V, the low battery LED flickers continuously and indicates that
the critical voltage level is reached. The Critical Battery event will be raised.
3.17 Maintenance Mode
3.17.1 Output Test
The output test feature is only visible from the Relay fascia and allows the user to operate the relays functions.
The output test of the selected function will automatically operate the binary Output assigned to that function.
Any protection function which is enabled in the setting menu will appear in the Output Test.
3.18 Self Monitoring
The 7SR45 Argus relay is built in with a number of self-monitoring features. The self monitoring is performed
periodically on boot up. The supervision includes monitoring of power supply signals, code execution watchdog,
memory checks by checksum, RTC check, and battery health checks. The ‘Protection Healthy’ LED is
illuminated when the internal power supply signals are healthy.
3.18.1 Internal Relay Failure (IRF)
The internal relay failure feature monitors the healthiness of the relay and supervises the following scenarios in
the presence of auxiliary power/CT power and IRF event will be generated.
1.
2.
Unexpected (Watch Dog) Error
In case of an unexpected behaviour of 7SR45 Argus Relay, IRF condition will be signalled and the relay
restarts.
If this error is observed frequently, the relay should be sent to the factory.
Internal Supply Voltage Error
7SR45 Argus Relay monitors the internal supply voltage and in case of an error, IRF condition will be
signalled.
The protection functions are blocked during this condition.
©2018 Siemens Protection Devices
Chapter 1 Page 44 of 48
Chapter 1 - 7SR45 Description of Operation
3.
4.
Card Error
In case of I/O card failure, the error message is displayed and IRF condition will be signalled.
The relay performance is not guaranteed and it should be sent to the factory.
MLFB Error
If the device information data is not correct during the start up, the error message will be displayed and IRF
condition will be signalled.
In case of MLFB error the relay will not be functional and the relay should be sent to the factory.
5.
Calibration Error
The 7SR45 Argus Relay checks for the integrity of the calibration data during the start up and displays a
message in case of an error and IRF condition will be signalled.
The user can acknowledge the error message via HMI only and the default calibration data will be applied to
the relay and IRF condition will be cleared.
The relay will be functional only when the calibration error message is acknowledged. In this case, the relay
performance is not guaranteed and it should be sent to the factory for calibration.
6.
Setting Error
The 7SR45 Argus Relay checks for the integrity of the settings during the start up and displays a message in
case of an error and IRF condition will be signalled.
The user can acknowledge the error message via HMI only and the default settings will be applied to the
relay and IRF condition will be cleared.
The relay will be functional only when the setting error message is acknowledged.
NOTE:
In case Card Error and MLFB Error, the relay will not be functional and the relay should be sent to the factory.
The following table displays the error messages and the error codes in the Instrument Mode.
Table 3-16
IRF
Errors
Error Code
Error Message
Setting Error
00000001
Load default settings!
Calibration Error
00000010
Load default calibration!
MLFB Error
00000100
MLFB Information Error!
Card Error
00001000
Analog & IO card Error!
Internal Supply Voltage Error
00010000
Unexpected Error
00100000
NOTE:
If a binary output is assigned to IRF, it is recommended not to use the same binary output for any other protection
function configuration.
3.19 Data Storage
The relay stores two types of data: Fault Records, Event records.
Data records are stored in the non-volatile memory. The data storage menu contains the settings for clearing
events and faults.
3.19.1 Fault Records (Trip Log)
Fault records are triggered when the protection function detects a fault condition and the trip alert message
appears on LCD to indicate that a new fault has occurred. Up to 10 fault records can be stored and displayed on
the fascia LCD.
Fault records provide a summary of relay status when the trip occurs, i.e. setting group, element issued the trip,
any phase/earth picked up, fault magnitude, LED indications, general alarm, and date and time.
Trip alert message is displayed until the fault is acknowledged by the user.
The event records and the fault records provide the full sequence of events that resulted to a trip for analysis.
Fault records are stored in a rolling buffer with the oldest faults overwritten. The fault storage can be cleared with
the DATA STORAGE > Clear Faults setting in HMI.
©2018 Siemens Protection Devices
Chapter 1 Page 45 of 48
Chapter 1 - 7SR45 Description of Operation
3.19.2 Event Records (Event Log)
The event recorder feature allows the time tagging of any change of state (Event) in the relay. When an event
occurs, the actual event condition is logged as a record with a date and time stamp to a resolution of 1 ms. The
relay can store maximum of 100 event records. When the event buffer is full, any new record will overwrite the old
records.
Stored events can be cleared by using the DATA STORAGE > Clear Events setting in HMI or from Reydisp.
The following events are logged:
• Change of state of binary outputs
• Change of state of binary inputs
• Change of settings
• Device start up and shut down
• Protection element operation
• Critical or low battery
• General alarm
• IRF
All events can be uploaded over the data communications channel(s) and displayed in the ‘Reydisp’ package in
chronological order and viewed in the sequence of events.
3.20 Real Time Clock
Time and date can be set either via the relay fascia using appropriate commands in the System Config menu or
using Reydisp software. When the relay is de-energized, time and date are maintained by CR1632, 3 V 140 mAh
Li/MnO2 coin cell battery.
The relay can be synchronized to the nearest second or minute using the Reydisp software. The device can have
a drift of ±6 s/day.
Table 3-17
Real Time Clock
Attribute
Accuracy (-10 °C to 60°C)
Value
±70 p.p.m
The default date is set as 01/01/2014 to indicate that the date is not set. In the relay, only the hours and minutes
can be edited. When the user presses ENTER after editing the seconds, seconds is set to zero and the clock
starts.
By default, the clock follows a 24 hour format for time and DD/MM/YYYY format for date.
3.21 Operating Mode
The 7SR45 Argus relay has the three operating modes:
•
Local
•
Remote
•
Out of Service
The following table identifies the functions operation in each mode. The modes can be selected by the following
methods:
SETTINGS MODE>SYSTEM CONFIG>Operating Mode setting, a Binary Input or Command.
©2018 Siemens Protection Devices
Chapter 1 Page 46 of 48
Chapter 1 - 7SR45 Description of Operation
Table 3-18
OPERATION
Operating Mode
REMOTE MODE
LOCAL MODE
OUT OF SERVICE MODE
USB/Rear Ports set to REMOTE *
Enabled
Disabled
Disabled
USB/Rear Ports set to LOCAL *
Disabled
Enabled
Disabled
Binary Inputs
Setting Option
Setting Option
Enabled
Binary Outputs
Enabled
Enabled
Disabled
Enabled
Enabled
Disabled
IEC
Enabled
Enabled
Disabled
MODBUS
Enabled
Enabled
Enabled
USB/Rear Ports set to REMOTE *
Enabled
Disabled
Enabled
Control
Reporting
Spontaneous
IEC
General Interrogation
Change of settings
USB/Rear Ports set to LOCAL *
Disabled
Enabled
Enabled
USB/Rear Ports set to LOCAL or
REMOTE *
Enabled
Enabled
Enabled
Fascia
Enabled
Enabled
Enabled
Historical Information
Event Records
Enabled
Enabled
Enabled
Fault Information
Enabled
Enabled
Enabled
Setting Information
Enabled
Enabled
Enabled
* Each Communication port has a setting to allow the user to determine which port is used for local operation and
which port is used for remote operation. If the port is set to Local or Remote, the port can be used for all
operations and has no priority.
The communication port modes can be selected at:
SETTINGS MODE>SYSTEM CONFIG>Communications
3.22 Settings Groups
The relay provides two groups of settings – Group number (Gn) 1 to 2. At any one time, only one group of settings
can be ‘active’ – SYSTEM CONFIG >Active Group setting.
By using the View/Edit Group settings, the user can edit one group when the relay operates as per the settings
from another “active” group.
Some settings are independent of the active group setting i.e. they apply to all settings groups. The group
dependent settings are indicated by Gn prefix.
A change of settings group can be achieved both locally at the relay fascia and remotely over the data
communications channel(s) or via a binary input. By default, setting group change by BI is level triggered.
NOTE:
When the setting group or any setting parameters is changed, the relay will restart to apply the new settings and
the protection is not active for a moment.
NOTE:
One setting group is available for the MLFB 7SR4501-xGx10-1AA0 variant.
3.23 Password Feature
The relay incorporates password protection for settings.
The programmable password feature enables the user to enter a 4 character alpha-numeric code to secure
access to the relay functions. The relay is supplied with the password set to NONE, i.e. the password feature is
disabled. The password must be entered twice as a security measure against the accidental changes. Once a
password has been entered then it will be required thereafter to change settings. Passwords can be de-activated
by using the password to gain access and by entering the password NONE. Again this must be entered twice to
deactivate the security system.
©2018 Siemens Protection Devices
Chapter 1 Page 47 of 48
Chapter 1 - 7SR45 Description of Operation
As soon as the user attempts to change a setting, the password is requested before any changes are allowed.
Once the password has been validated, the user is ‘logged on’ and any further changes can be made without
re-entering the password. If no more changes are made within 1 minute then the user will automatically be
‘logged off’, re-enabling the password feature.
The password prevents unauthorised changes to settings from the. front fascia or over the data communications
channel(s).
The password validation screen also displays a numerical code. If the password is lost or forgotten, this code
should be communicated to Siemens customer support representatives and the password can be retrieved.
3.24 Battery
7SR45 Argus Relay consists of CR123A, 3V 1400 mAh Li-Mn non rechargeable battery. The battery is used to
energize the device when auxiliary voltage/phase current/USB is not available. The user can perform actions such
as viewing the fault records, setting change, and resetting the flags with battery power.
3.25 Firmware Update
In 7SR45 Argus Relay, firmware can be updated by performing the following procedure:
1.
Connect the relay to a local PC using a USB cable.
2.
Run the valid executable file from the local PC.
The application detects the connected relay and updates the firmware.
If any failure occurs, a message appears automatically in the PC application.
3.
After successful update, the relay automatically restarts.
!
Do not disconnect the USB when the firmware update is in progress. If the firmware update is
terminated intermittently, it may corrupt the existing firmware in the relay and the relay may stop
working.
This alert appears when the firmware is updated.
This alert appears only when the 7SR45 Argus Relay is loaded with
2438H80001R2a-1a firmware.
The following table shows the compatibility of 7SR4501 and 7SR4502 device and firmware.
Table 3-19
Device Version
Firmware Version
7SR450/EE
2438H80001R2a-1a
7SR450/DD
7SR450/CC
7SR450/BB
7SR450/BB
Firmware Update Compatibility
2438H80001R1e-1a
2438H80001R1d-1a
2438H80001R1c-1a
2438H80001R1b-1a
2438H80001R1a-1a
NOTE:
The incompatibility of device and firmware will display an error message
“MLFB INFORMATION ERROR”.
©2018 Siemens Protection Devices
Chapter 1 Page 48 of 48
Chapter 2 - 7SR45 Settings & Instrument Guide
7SR45
Settings & Instruments
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
© 2018 Siemens Protection Devices
Chapter 2 - 7SR45 Settings & Instrument Guide
Contents
Section 1: Introduction ....................................................................................................................................... 3
1.1 Relay Menus ..................................................................................................................................... 3
1.2 Operation Guide ................................................................................................................................ 3
1.2.1
User Interface Operation ...................................................................................................... 3
1.3 Setting Mode ..................................................................................................................................... 3
1.4 Instrument Mode................................................................................................................................ 4
1.5 Fault Data Mode ................................................................................................................................ 6
Section 2: Setting & Configuring the Relay Using Reydisp Evolution.................................................................... 7
2.1 Physical Connection .......................................................................................................................... 7
2.1.1
Front USB connection .......................................................................................................... 7
2.1.2
Rear RS485 connection........................................................................................................ 7
2.1.3
Configuring Relay Serial Data Communication ...................................................................... 8
2.2 Connecting to the Relay for setting via Reydisp .................................................................................. 9
List of Figures
Figure 1-1
Figure 1-2
Figure 1-3
Figure 2-1
Figure 2-2
Figure 2-3
Menus.......................................................................................................................................... 3
Relay Identifier Screen ................................................................................................................. 3
Menu Structure............................................................................................................................. 5
USB connection to PC .................................................................................................................. 7
RS485 connection to PC .............................................................................................................. 7
PC Com Port Selection................................................................................................................. 9
© 2018 Siemens Protection Devices
Chapter 2 Page 2 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
Section 1: Introduction
1.1
Relay Menus
1.
Setting Mode – This mode allows the user to view and change settings in the relay.
2.
Instrument Mode – This mode allows the user to view the conditions of the relay i.e. Current, IO
status, and Misc. status.
3.
Fault Data Mode – This mode allows the user to view fault records.
If the password is configured, the user can only view all the menus without entering a password. Further
actions are permitted if the correct password is entered.
Relay Identifier
Setting Mode
Figure 1-1
1.2
1.2.1
Fault Data
Mode
Instrument Mode
Menus
Operation Guide
User Interface Operation
Figures 1.3 show the basic menu structure diagram and display the main modes:
•
SETTING MODE
•
INSTRUMENT MODE
•
FAULT DATA MODE
When the relay is shipped from the factory all stored data is cleared and the password is set to NONE.
When the relay is energized for the first time, the following message is displayed:
Figure 1-2
1.3
Relay Identifier Screen
Setting Mode
The Setting Mode is reached by pressing the READ DOWN▼ or by pressing ENTER key from the Relay Identifier
Screen.
Once the Setting Mode is reached, the user can navigate into the settings mode sub-menus.
Each sub-menu contains the configurable settings of the relay in separate groups. The sub menus are accessed
by pressing the TEST/RESET► key. Press ▲ or ▼ keys to scroll through the first and last settings. If the keys
are pressed further from the first and last settings sub menu, it exits from the sub menu and returns to the
previous menu.
© 2018 Siemens Protection Devices
Chapter 2 Page 3 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
Press ENTER key to edit the setting value. If the relay setting is password protected, the user is prompted to
enter the password. After entering the correct password, the user is allowed to configure the settings. If an
incorrect password is entered, editing is not permitted. The password is not required to view and navigate to all
screens.
When a setting is edited, flashing characters indicate the edit field. Press the ▲ or ▼ key to scroll through the
valid field values. Hold the ▲ or ▼ keys to increase the rate of scrolling. To navigate between the digits of the
setting values, press TEST/RESET► key.
Once the setting is updated by the user, press the CANCEL key to return to the Relay Identifier screen. The LCD
displays the “Save & Restart” prompt message. Press ENTER to store the setting in non-volatile memory and
the relay will restart. Press CANCEL key to discard the changed settings.
1.4
Instrument Mode
The Instrument Mode sub-menu displays the current values, status of binary inputs and binary outputs. The
following meters are available and are navigated by using the ▲, ▼, and TEST/RESET► keys.
INSTRUMENT
CURRENT METER
→to view
Primary Current
Ia
0.00A
Ib
0.00A
Ic
0.00A
Ig
0.00A
In
0.00A
Secondary Current
Ia
0.000A
Ib
0.000A
Ic
0.000A
Ig
0.000A
In
0.000A
BINARY I/p METER
→to view
BI 1-4
__
BINARY O/p METER
→to view
BO 1-4
__
GEN ALARM METER
ALARM1
Cleared
ALARM2
Cleared
ALARM3
Cleared
ALARM4
Cleared
→to view
ALARM 1-4
Cleared
MISC. METER
BATTERY PROFILE
© 2018 Siemens Protection Devices
DESCRIPTION
This sub-group includes all the meters that are associated with current.
TEST/RESET► key allows access to sub-group.
The values of current refreshes at every 1 s interval.
Displays the primary values of 3 phase currents, measured and derived earth
currents.
Displays the secondary values of 3 phase currents, measured and derived
earth currents.
Binary Input Meter displays the status of the binary input signals.
TEST/RESET► key allows access to sub-group.
The values of binary input status refreshes at every 1 s interval.
Displays the state of binary inputs 1 to 4 (The number of binary
inputs may vary depending on model).
If status is "_" the value is zero. If status is "1" the value is one.
Binary Output Meter displays the status of the binary output signals.
TEST/RESET► key allows access to sub-group.
The values of BO status refreshes at every 1 s interval.
Displays the state of binary outputs 1 to 4 (The number of binary outputs may
vary depending on model).
If status is "_" the value is zero. If status is "1" the value is one.
General Alarm Meter displays the status of the General Alarms.
TEST/RESET► key allows access to sub-group.
The General Alarm status refreshes at every 1 s interval.
Displays the state of General Alarms 1 to 4.
The Alarm can be renamed in Settings Menu and the updated name will
appear in this window.
The status can be “Cleared” or “Raised” depending on the Binary Input linked
to the General Alarm
Misc. meter displays the status of the auxiliary voltage input and IRF.
Misc. meter gives more information about the active setting group, fault and
event records in the device, status of auxiliary Input and IRF.
For more information about IRF, refer to Chapter 1, IRF table.
The battery profile meter displays the status of the operations performed on
the battery power.
Chapter 2 Page 4 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
7SR45
Press ENTER
SETTING MODE
SYSTEM CONFIG
INSTRUMENT MODE
FAULT DATA MODE
CURRENT METER
PRIMARY CURRENT
BINARY I/P METER
BI STATUS
BINARY O/P METER
BO STATUS
PRIMARY CURRENT Ib
CT/ VT CONFIG
FUNCTION CONFIG
GEN ALARM METER
PRIMARY CURRENT Ic
GENERAL ALARM
STATUS
PRIMARY CURRENT Ig
MISC METER
SETTING GROUP
BATTERY PROFILE
Device ON Dur’n
FAULT RECS
Backlit ON Dur’n
EVENT RECS
BO Oper’n Count
AUXILIARY INPUT
BI Oper’n Count
CURRENT PROT’N
IRF STATUS
51 - 1
50 - 1
PHASE O/C
PRIMARY CURRENT I a
PRIMARY CURRENT In
SECOND’Y CURRENT
SECOND’Y CURRENT I a
SECOND’Y CURRENT I b
SECOND’Y CURRENT Ic
SECOND’Y CURRENT I g
SECOND’Y CURRENT In
50 - 2
51 N - 1
50 N - 1
DERIVED E/ F
50 N - 2
51 G - 1
50 G - 1
MEASURED E/F
50 G - 2
Inhibit 50-1
Inhibit 50-2
Inhibit 51-1
Inhibit 50N-1
50 LC/ SOTF
Inhibit 50N-2
Inhibit 51N-1
Inhibit 50G-1
Inhibit 50G-2
Inhibit 51G-1
Inhibit 50LC
Select Group 1
Select Group 2
INPUT CONFIG
Rst LEDs & O/Ps
INPUT MATRIX
Trip Pulse O/P
Local mode
Remote mode
Local or Remote mode
#
Out Of Service mode
General Alarm 1
General Alarm 2
General Alarm 3
General Alarm 4
Inverted Inputs
Enabled in Local
Enabled in Remote
*
#
BI 1 Pickup
BI 1 Dropoff
BI 2 Pickup
BI 2 Dropoff
BI 3 Pickup
BI CONFIG
BI 3 Dropoff
BI 4 Pickup
*
BI 4 Dropoff
General Alarm - 1
General Alarm - 2
GENERAL ALARMS
General Alarm - 3
General Alarm - 4
*
50-1
50-2
51-1
OUTPUT CONFIG
50N-1
50N-2
51N-1
OUTPUT MATRIX
50G-1
50G-2
Hand Reset O/Ps
BO CONFIG
51G-1
50LC
Active Grp 1
Active Grp 2
General Pickup
Prot’n Healthy
RS485-Protocol
Low Battery
RS485-StnAddr1
COMMUNICATION *
#
IRF
Local mode
RS485-BaudRate
RS485-Parity
Remote mode
Out Of Service mode
BI 1 Operated
RS485-Mode
USB-Protocol
USB-StnAddr1
BI 2 Operated
BI 3 Operated
BI 4 Operated
USB-Mode
#
*
Clear Faults
DATA STORAGE
MAINTENANCE
Clear Events
Clr Battery Data
Output Test
* Available for 7SR45 Argus Dual Powered Relay
# For 7SR4501-xGA10-1AA0 variant, the multiple settings group and relay modes are not available.
Figure 1-3
© 2018 Siemens Protection Devices
Menu Structure
Chapter 2 Page 5 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
1.5
Fault Data Mode
7SR45 Argus Relay stores maximum of 10 fault records. Each stored fault data can be viewed by pressing the
TEST/RESET► key. Each record contains data of the operated elements, analogue values, and LED status at
the time of the fault. The data is viewed by scrolling down using the▼ key.
© 2018 Siemens Protection Devices
Chapter 2 Page 6 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
Section 2: Setting & Configuring the Relay Using Reydisp
Evolution
To set the relay using a communication port the user will need the following:PC with Reydisp Evolution Version 9.51.02 or later version Installed. (This can be downloaded from our website
and found under the submenu ‘Software’) This software requires windows 2000-service pack 4 or above, or
windows XP with service pack 2 or above and Microsoft.NET framework for tools.
2.1
Physical Connection
The relay can be connected to Reydisp via any of the communication ports on the relay. Suitable communication
Interface cable and converters are required depending which port is being used.
2.1.1
Front USB connection
To connect your pc locally via the front USB port.
USB Type B
socket on Relay
USB Type A
Socket on PC
USB Type B
USB Type A
Figure 2-1
2.1.2
USB Data Cable
USB connection to PC
Rear RS485 connection
RS232 to RS485
Converter
USB or 9 pin male
D connector
Laptop computer
RS232 straight
through cable or
USB to RS232
Converter cable
Figure 2-2
© 2018 Siemens Protection Devices
A/+
A/+
B/-
B/-
RS485 Screened
twisted pair
Rear terminals
25 pin male D
connector
RS485 connection to PC
Chapter 2 Page 7 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
2.1.3
Configuring Relay Serial Data Communication
This section is applicable for configuring the 7SR45 Argus Dual Powered Relay.
Using the keys on the relay fascia scroll down the settings menus into the ‘communications’ menu and if
necessary change the settings for the communication port you are using on the relay. Reydisp software uses
IEC60870-5-103 protocol to communicate.
When connecting the relay to a PC using the front USB port, the Reydisp setting software will automatically detect
the relay without making any setting changes in the relay first as long as the USB is selected to IEC60870-5-103.
Table 2-1
COM1-RS485 Port and COM2-USB Port
Description
Range
Default
COM1-RS485 Protocol
OFF, IEC60870-5-103, MODBUS-RTU
MODBUS-RTU
COM1-RS485 Station Address
0 - 254 for IEC60870-5-103
1
Sets the station address for COM1-RS485
1 - 247 for Modbus RTU
COM1-RS485 Baud Rate
1200, 2400, 4800, 9600, 19200, 38400,
57600
19200
Sets the communications baud rate for COM1-RS485
COM1-RS485 Parity
NONE, ODD, EVEN
NONE
Local, Remote, Local Or Remote
Local or Remote
OFF, MODBUS-RTU, IEC60870-5-103
IEC60870-5-103
0, 1 ... 254
1
Local, Remote, Local Or Remote
Local or Remote
Selects protocol to use for COM1-RS485
Selects whether parity information is used
COM1-RS485 Mode
Selects whether the port is Local or Remote.
COM2-USB Protocol
Selects protocol to use for COM2-USB
COM2-USB Station Address
Sets the station address for COM2-RS485
COM2-USB Mode
Selects whether the port is Local or Remote.
© 2018 Siemens Protection Devices
Chapter 2 Page 8 of 9
Chapter 2 - 7SR45 Settings & Instrument Guide
2.2
Connecting to the Relay for setting via Reydisp
When Reydisp software is running all available communication ports will automatically be detected.
On the start page tool bar open up the sub-menu ‘File’ and select ‘Connect’.
The ‘Connection Manager’ window will display all available communication ports. With the preferred port
highlighted select the ‘Properties’ option and ensure the baud rate and parity match that selected in the relay
settings. Select ‘Connect’ to initiate the relay-PC connection.
Figure 2-3
PC Com Port Selection
The relay settings can now be configured using the Reydisp software. Please refer to the Reydisp Evolution
Manual for further guidance.
NOTE:
1.
In Reydisp Evolution, verify that “Do NOT Check Communications Connection” is selected in the
Advanced properties.
2.
In Reydisp Evolution, check that the Relay Address is set as “1” in the Relay menu. (this is for V1 and V2
basic)
3.
In Reydisp Evolution, check that the Relay Address in the Relay menu is same as that of the Device
address.(for all other variants of V2).
© 2018 Siemens Protection Devices
Chapter 2 Page 9 of 9
Chapter 3 - 7SR45 Performance Specification
7SR45
Performance Specification
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
© 2018 Siemens Protection Devices
Chapter 3 - 7SR45 Performance Specification
Contents
Section 1: Performance Specification ................................................................................................................. 3
1.1 Indication of Conformity ..................................................................................................................... 3
1.2 Technical Specifications .................................................................................................................... 3
1.3 Environmental Performance .............................................................................................................. 7
1.4 Performance Specification ............................................................................................................... 14
©2018 Siemens Protection Devices
Chapter 3 Page 2 of 14
Chapter 3 - 7SR45 Performance Specification
Section 1: Performance Specification
1.1
Indication of Conformity
This product complies with the directive of the Council of the European Communities on the
harmonization of the laws of the Member States relating to electromagnetic compatibility (EMC
Directive 2014/30/EU) and concerning electrical equipment for use within specified voltage limits
(Low Voltage Directive 2014/35/EU) as well as restriction on usage of hazardous substances in
electrical and electronic equipment (RoHS Directive 2011/65/EU).
This conformity has been proved by tests conducted by Siemens AG in accordance of the Council
Directive in accordance with the product standard IEC/EN 60255-26 for the EMC directives, and
with the standard IEC/EN 60255-27 for the low-voltage directive.
RoHS directive 2011/65/EU is met using the standard EN 50581. The device has been designed
and produced for industrial use.
1.2
Technical Specifications
This section provides the technical information of 7SR45 Argus Relay.
Table 1-1
Technical Data Overview
Product Family
Non Directional Self Powered /Dual Powered Overcurrent and Earth
Fault Relay
Case and LEDs
Non draw-out Polycarbonate case (Size 4 standard, Non draw-out
design), 9 non-programmable LEDs
Measuring Inputs
1 A or 5 A (ordering option),
(Current)
50 Hz/60 Hz
Auxiliary voltage
24 V – 60 V DC
60 V – 240 V AC/DC
Communication
Front communication port: USB (IEC 60870-5-103 or Modbus RTU)
Rear communication port: RS485 (IEC 60870-5-103 or Modbus RTU)
Protection Functions
50, 50G/N, 51, 51G/N, 50LC/SOTF
Binary Input and Binary
Output
4 BI and 4 BO *
Remote flag
24 V, 0.01 Ws
Local flag
Mechanical Flag Indicator
• Normal – Green colour
• Trip – Red colour
Pulse output
24 V, 0.1 Ws pulse output
Overvoltage
Category III
Pollution Degree
2
Altitude above sea level
Maximum up to 2000 m
* Depending on the ordering option
© 2018 Siemens Protection Devices
Chapter 3 - 7SR45 Performance Specification
Table 1-2
Minimum phase current
for relay operation
Sensitivity
20% of nominal current in single phase
13% of nominal current in three phases
Table 1-3
Mechanical Specifications
Design
Panel mounting, Non draw-out polycarbonate moulded case
Enclosure
IP 52 (front panel)
IP 40 (enclosure sides)
IP 20 (rear side)
Depth is 203 mm
Weight
1.97 kgs (appx)
Table 1-4
7SR4501/7SR4502 Argus Self/Dual Powered Relay Recommended
Terminal Lugs Specifications
Terminal Blocks
Type/Cable Specifications
Current Inputs
TE connectivity PIDG Series insulated tin plated Crimp ring terminal,
M3.5 Stud size, 2.6 mm² to 6.6 mm², 12 AWG
Auxiliary Supply
Insulated tin plated crimp Pin connector, 2.6 mm² to 6.6 mm², 12 AWG
to 10 AWG
Rear Communication
Port
Pin type lug/1.5 mm2 control cable
Front Communication
Port
USB, Type B
Binary Input/ Binary
Output/Pulse Output/
Flag Output
Insulated tin plated crimp Pin connector, 2.6 mm² to 6.6 mm², 12 AWG
to 10 AWG
Ground Terminal
Tin plated crimp ring terminal, M3 stud size, 4 mm² to 6 mm², 12 AWG
to 10 AWG, Yellow
Table 1-5
Rated Voltage
Auxiliary Supply
60 V - 240 V AC/DC,
Tolerance – 20% to +10%
24 V – 60 V DC
Tolerance – 20% to +10%
(ordering option)
Frequency
50 Hz (Range: 45 Hz to 55 Hz)
60 Hz (Range: 54 Hz to 66 Hz)
Allowable superimposed
AC component (Ripple)
15% of DC voltage
Typical Power
consumption (DC)
Typical Power
consumption (AC)
<7W
Max Interruption time
(Collapse to Zero)
≤20 ms (19.2 V DC)
< 12 VA
≤ 20 ms (48 V DC)
≤ 500 ms (230 V AC)
©2018 Siemens Protection Devices
Chapter 3 Page 4 of 14
Chapter 3 - 7SR45 Performance Specification
Table 1-6
Quantity
3 x Phase and 1 x Earth
Rated Current In
1 A or 5 A (ordering option)
Measuring Range
0.2xIn to 20xIn
Instrumentation
± 5 % (Typical)
Current Inputs
(≥0.13xIn to 2xIn)
± 3%
(> 2xIn to 20xIn)
Frequency
50 Hz (Range: 45 Hz to 55 Hz)
60 Hz (Range: 54 Hz to 66 Hz)
Rated CT Burden *
(measured at Nominal
Currents (1 A and 5 A))
≤ 2.5 VA per phase and ≤ 0.2 VA earth for 1 A CT input
≤ 3.0 VA per phase and ≤ 0.2 VA earth for 5 A CT input
NOTE:
* Refer to Chapter 7, Applications Guide - Current Transformer Requirements for the practical CT burden
selection.
Table 1-7
Number
Binary Inputs
2 or 4
19.2 V DC
Range 24 V – 66 V DC
88 V AC/DC
Range 88 V – 265 V DC
68 V – 265 V AC
Maximum AC/DC current
for operation
3.5 mA
Pick Up Delay
User selectable 0 to 600 s (up to 10 mins)
Drop Off Delay
User selectable 0 to 600 s (up to 10 mins)
Table 1-8
Number
Binary Outputs
2 (1 NO contact and 1 C/O contact)
or
4 (2 NO contact and 2 C/O contact)
Operating Voltage
Potential free
Operating Mode
User selectable - BO 1 and BO 2 Self or Hand/Electrical Reset
BO 3 and BO 4 Self Reset (Operated only with Auxiliary input is
present)
Operating Time from
energizing Binary Input
< 20 ms
Making Capacity:
Carry continuously
5 A AC or DC
Make and carry
(L/R ≤ 40 ms and
V ≤ 300 V)
20 A AC or DC for 0.5 s
30 A AC or DC for 0.2 s
© 2018 Siemens Protection Devices
Chapter 3 - 7SR45 Performance Specification
Breaking Capacity
( ≤ 5 A and ≤ 250 V):
AC Resistive
AC Inductive
DC Resistive
DC Inductive
Disengaging time
1250 VA
250 VA at p.f. ≤ 0.4
75 W
30 W at L/R ≤ 40 ms
50 W at L/R ≤ 10 ms
< 20 ms
Table 1-9
Front Communication Port
Quantity
1
Electrical connection
USB, Type B
Protocol Support
Modbus RTU, IEC 60870-5-103
Table 1-10
Rear Communication Port
Quantity
1 (Optional)
Electrical connection
RS485, 2 wire electrical, twisted pair
Protocol Support
Modbus RTU, IEC 60870-5-103
Rate
Data Transfer rate:
1200 to 57600 bps
Table 1-11
Fault Record
10 records
Events
100 events (1 ms resolution)
©2018 Siemens Protection Devices
Data Storage
Chapter 3 Page 6 of 14
Chapter 3 - 7SR45 Performance Specification
1.3
Environmental Performance
This section describes about the environmental tests performed with 7SR45 Argus Relay under different
conditions.
Table 1-12
Mechanical Tests
Type Test
Reference
Requirement
Degree of Protection
IEC 60529
IP52 front
IP20 rear
Vibration
IEC60255-21-1
1.
2.
Vibration Endurance, Class 1, Peak
Acceleration 1gn
X, Y, Z axis (20 sweeps/axis)
Vibration Response, Class 1, Peak
Acceleration 0.5gn
X, Y, Z axis (1 sweeps/axis)
Frequency Range : 10 Hz to 150 Hz
Sweep rate
: 1 octave/min
Shock and Bump
IEC 60255-21-2
1.
2.
3.
Seismic
IEC 60255-21-3
1.
2.
Shock response, Class 1,
Peak Acceleration 5gn
X, Y, Z axis (3 per direction)
Total number of shocks: 18
Shock withstand, Class 1,
Peak Acceleration 15gn
X, Y, Z axis (3 per direction)
Total number of shocks: 18
Bump, Class 1,
Peak Acceleration 10gn
X, Y, Z axis (1000 per direction)
Total number of Bumps: 6000
In single axis sine sweep in X axis, Class 1,
Peak Acceleration 1 gn
In single axis sine sweep in Y axis, Class 1,
Peak Acceleration 0.5 gn
Frequency Range : 1 Hz to 35 Hz
Sweep rate
: 1 octave/minute
Contact
IEC 60255-1
(Ref: Std IEC 61810-1)
Making Capacity
Carry continuously
Make and carry
(L/R ≤ 40 ms and V ≤ 300 V)
Breaking Capacity
( ≤ 5 A and ≤ 250 V)
Electrical Endurance
Test
IEC 60255-1
(Ref: Std IEC 61810-1)
© 2018 Siemens Protection Devices
10000 operations at 250 V, 5 A
Chapter 3 - 7SR45 Performance Specification
Table 1-13
Type Test
Reference
Insulation Resistance
IEC 60255-27 ,
Edition 2.0
Impulse Voltage
Withstand
IEC 60255-27
Edition 2.0
AC Dielectric Voltage
IEC 60255-27
Edition 2.0
Electrical Tests
Requirement
#
Insulation resistance >100 MOhms at
500 V DC
Test Duration: > 5 s
#,
5 kV, 1.2/50 µs, 0.5 J
5 +ve, -ve pulses
(Between all terminals and case earth and any
two independent circuits) ^
#,
•
•
Slow Damped
Oscillatory Wave
IEC 60255-26
Electrostatic Discharge IEC 60255-26
All case terminals connected together
2.0 kV AC RMS, 1 minute
(Between terminals of independent circuits)^
1.0 kV AC RMS, 1 minute
(across normally open contacts)
•
•
•
•
•
Common-mode test voltage: 2.5 kV
peak voltage
Differential mode: 1.0 kV peak voltage
Test duration: 2s
Source impedance: 200 Ω
Voltage oscillation frequency: 1 MHz
Repetition frequency: 400 Hz
•
•
8 kV air discharge
6 kV contact discharge
•
Electrical Fast
Transient or Burst
IEC 60255-26
Zone B
Test severity Amplitude : ±2 kV
Repetition frequency : 5 kHz
Surge Immunity
IEC 60255-26
Front time/Time to half-value : 1.2/50 µs
Source Impedance : 2 Ohms
Test Level : Zone A
Line to Line : 0.5, 1, 2 kV
Line to Earth : 0.5, 1, 2, 4 kV
Radiated Immunity
IEC 60255-26
Test field strength, frequency band
80 MHz to 1.0 GHz and 1.4 GHz to 2.7 GHz:
10 V/m, Test using AM: 1 kHz/80%
Conducted Radio
IEC 60255-26
Frequency Interference
150 kHz to 80 MHz
10 V (RMS), Dwell time: 0.5 s
Power Frequency
Magnetic Field
IEC 60255-26
30 A/m applied continuously,
300 A/m applied for 3 s
Radiated Emissions
IEC 60255-26
30 MHz – 230 MHz, 40 dB µ V/m (quasi peak)
230 MHz – 1 GHz, 47 dB µ V/m (quasi peak)
Limits are measured at 10 m distance
Conducted Emissions
IEC 60255-26
0.15 MHz – 0.5 MHz 66 dB (µV) (Average)
79 dB (µV) (quasi peak)
0.5 MHz - 30 MHz
60 dB (µV) (Average)
73 dB (µV) (quasi peak)
©2018 Siemens Protection Devices
Chapter 3 Page 8 of 14
Chapter 3 - 7SR45 Performance Specification
#
Thermal Withstand
IEC 60255-27 ,
Edition 2.0
Continuous withstand:
2 x In
Short time withstand:
Test duration 1 s
50 A (1 A Current input)
150 A (5 A Current input)
Functional
performance
IEC 60255-1 and
IEC 60255-151
for both 1 A Relay and 5 A Relay
Maximum Allowable
Temperature
IEC 60255-6
Max. temperature limit +100° C
Gradual shutdown/
Start-up test
IEC 60255-26
Shut down/start up ramp 60 s
Power off 5 mins
NOTE:
#
All aspect of IEC 60255-5 have been covered under IEC 60255-27.
^ Flag Output and Pulse Output (X3) are excluded between any terminals and earth.
Table 1-14
Auxiliary Supply Variation (60 - 240 V AC/DC Variant)
Type Test
Reference
Parameters
AC Voltage Dips
IEC 60255-26
1
0% RV for 25 cycles @ Normal Operation
50 Hz
RV = 230 V AC
Declared Operation
0% RV for 25 cycles @
60Hz
40% RV for 10 cycles
@ 50Hz
Normal Operation1
40% RV for 12 cycles
@ 60Hz
70% RV for 25 cycles
@ 50Hz
1
Normal Operation
70% RV for 30 cycles
@ 60Hz
DC Voltage Dips
IEC 60255-26
RV = 110 V DC
DC Voltage Dips
IEC 60255-26
RV = 48 V DC
Gradual shutdown /
Start-up test
IEC 60255-26
1
0% RV for 0.02 s
Normal Operation
40% RV for 0.2 s
Normal Operation
70% RV for 0.5 s
Normal Operation1
0% RV for 0.02 s
Normal Operation
40% RV for 0.2 s
Normal Operation1
70% RV for 0.5 s
Normal Operation1
Shut down ramp 60 s
Normal Operation
1
1
2
Power off 5 mins
Start up ramp 60 s
Voltage interruption
(AC/DC auxiliary
supply)
Normal Operation2
IEC 60255-26
© 2018 Siemens Protection Devices
0% RV at 5 s
Chapter 3 - 7SR45 Performance Specification
Type Test
Reference
Parameters
Declared Operation
IEC 60255-26
15% of DC voltage
Normal Operation
RV = 48 V/220 V DC
RV = 230 V AC
Alternating
component in DC
(Ripple)
Duration: 10 mins
DC Power supply
1
2
1
No effect on relay performance
Restart with no mal-operation, loss of data or relay damage
RV = Residual Voltage
Table 1-15
Climatic Environmental Tests
Type Test
Reference
Requirement
Ambient Operating
Temperature
IEC 60068-2-1,
IEC 60068-2-2,
IEC 60255-1
-10°C to + 60°C
Permissible Temporary IEC 60068-2-1,
Operating Temperature, IEC 60068-2-2,
(Tested for 16 h) *
IEC 60255-1
-40°C
Permissible Temporary IEC 60068-2-1,
Operating Temperature, IEC 60068-2-2
(Tested for 96 h)
IEC 60255-1
-20°C to + 70°C
Storage Temperature
(Non-operational) #
IEC 60068-2-1,
IEC 60068-2-2
IEC 60255-1
-25°C to + 70°C
Cold test operational
(Energized condition)
IEC 60068-2-1
IEC 60255-1
-10°C, 96 h
Cold test storage
(Unenergized
condition)
Dry heat test
operational
(Energized condition)
LCD display operating range: -20°C to + 70°C
-25°C, 16 h
IEC 60068-2-2
IEC 60255-1
+60°C, 96 h
+70°C, 16 h
Dry heat test storage
(Unenergized condition)
Damp heat test, Steady IEC 60068-2-78
State
IEC 60255-1
10 days at 93 ±3% RH, +40°C
Damp heat test, Cyclic
+25…55°C, R.H. > 93 % RH (6 cycles)
At lower temperature, 97%, -2% +3% RH
At upper temperature, 93%, ±3% RH
IEC 60068-2-30
IEC 60255-1
* Applicable for the following:
 Self powered relay with the rated current.
 Dual powered relay with the rated auxiliary voltage of 110 V DC and above
# For battery - To retain the battery life during the transportation and storage, it is recommended to
maintain the permissible temperature range from -20°C to +45°C
.
©2018 Siemens Protection Devices
Chapter 3 Page 10 of 14
Chapter 3 - 7SR45 Performance Specification
Table 1-16
Product Safety Test
Type Test
Reference
Clearances and
Creepage Distances
IEC/EN 60255-27: Edition 2: Clearances and
creepage distances
2013-10
between external
circuits mutual and to
the enclosure
≥ 4 mm
IP Rating
IEC/EN 60255-27: Edition 2: For Unit Front side
2013-10
For Unit Rear side
IP52
Impulse Voltage
IEC/EN 60255-27: Edition 2
Parameters
IP20
5 kV, 5 +ve, -ve pulses
AC Dielectric Voltage IEC/EN 60255-27: Edition 2: Test voltage (AC): 2.0 kV
2013-10
Test frequency: 50 Hz
Test duration: 1 min
Insulation Resistance IEC/EN 60255-27: Edition 2: Test voltage: 500 V DC
2013-10
Test duration: > 5 s
Protective Bonding
Resistance
Values
After test, the relay
should be operative
(Reinforced Insulation
with communication
circuit)
> 100 Mohm
IEC/EN 60255-27: Edition 2: Test voltage: < 12 V
2013-10
AC/DC
Test duration: 1 min
Bonding resistance
Protective Bonding
Continuity
IEC/EN 60255-27: Edition 2: Accessible conductive
parts should be bonded
2013-10
with the protective
conductor terminal
Flammability of
IEC/EN 60255-27: Edition 2: Structure Part
Insulating Materials,
2013-10
Components and Fire
enclosures
Terminals
© 2018 Siemens Protection Devices
< 0.1 Ohm
Low current continuity
test
Standard for
insulating material of
flammability class
Class UL 94 V-0
Terminal Mounting
Class UL 94 V-0
Wiring (CT)
(N)2GFAF (VDE)
Components mounting
Class UL 94 V-0
Enclosure
Class UL 94 V-0
PCB
Class UL 94 V-0
LCD
Class UL 94 V-0
Chapter 3 - 7SR45 Performance Specification
Type Test
Reference
Parameters
Single Fault Condition IEC/EN 60255-27: Edition 2: Assessment of:
2013-10
• Insulation between
circuits and parts
Marking and
Documentation
IEC 61010-1: 2010
•
Compliance with
requirements for
protection against the
spread of fire
•
Overloads
•
Intermittently rated
resistors
•
Compliance with
requirements for
mechanical protection
Values
The equipment shall
not present a risk of
electric shock or fire
after a single-fault
test.
Clause No. 5
-
Protection against
electric shock
Clause No. 6
-
Protection against
mechanical hazard
Clause No. 7
-
Resistance to
mechanical stresses
Clause No. 8
-
Protection against the
spread of fire
Clause No. 9
-
Equipment
temperature limits
and resistance to heat
Clause No. 10
-
Protection against
liberated gases and
substances, explosion
and implosion
Clause No. 13
-
Components and sub
assemblies
Clause No. 14
-
HAZARDS resulting
from application
Clause No. 16
-
Risk Assessment
Clause No. 17
-
©2018 Siemens Protection Devices
Chapter 3 Page 12 of 14
Chapter 3 - 7SR45 Performance Specification
Table 1-17
Real Time Digital Simulation Test (RTDS)
Trip Response at different fault currents
Fault current: 1.1, 2, 3, 5, 10 times of set value
Influence of DC components
DC content at first peak : 100%
Decay time (X/R ratio): 25 ms, 50 ms, 100 ms
Immunity to inrush current
Influence on Accuracy
2nd harmonic content : up to 28%
Relay behaviour at primary CT saturation
Fault currents: 10 A, 20 A, 40 A
Trip response at recurring faults
Fault current: 2 times and 5 times of set value.
Delay between recurring faults: 300 ms, 1 s, 2 s
Table 1-18
Test Conditions
Inrush Response Test
Simulated Inrush current with 15% 2nd harmonic
content
Test Result
The immunity against inrush currents is up to 3
times of the peak value with 95% fundamental
current (Iset).
For more information about Inrush response, refer to Inrush Response section of
Chapter 7 - 7SR45 Applications Guide.
© 2018 Siemens Protection Devices
Chapter 3 - 7SR45 Performance Specification
1.4
Performance Specification
This section describes about the settings available for different protection functions and its tolerance limits.
Table 1-19
50 Instantaneous & DTL OC & EF
Operation
Non directional
Elements
Phase, Derived Earth, Measured Earth
Setting Range Is (50/50N/50G)
0.2, 0.3,..... 20.0xIn
Time Delay
0,0.01,....600 s
Operate Level Iop
100% Is, ±5%
> 0.2xIn to 0.9xIn setting: ≥ 90 % Iop
Reset level
> 1xIn to 20xIn setting: ≥ 94 % Iop
Basic Operate time
(with auxiliary power/load current):
50, 50G, 50N
2xIS 25 ms, ±15 ms,
5xIS 20 ms, ±15 ms
Operate time delay
Tbasic+Td, ± 1% or ± 30 ms
Inhibited by
Binary Input
Disengaging time
< 50 ms *
NOTE:
* With auxiliary power supply
Table 1-20
51 Time Delayed OC & EF
Operation
Non directional
Elements
Phase, Derived Earth, Measured Earth
Setting Range Is (51)
0.2, 0.21… 2.0xIn
Setting Range Is (51G, 51N)
0.1,0.11… 0.8xIn
Time Multiplier
0.01,0.02.....10
Time Delay (DTL)
0.00, 0.01... 15 s
Operate Level
110% Is, ±5% or ±2%x In
Reset level
≥90 % Iop
Operate time
(with auxiliary power/load current)
IEC
top =
K
[ IsI ]α − 1
× Tm
 A

top =  P + B  × Tm
I
 [ Is ] − 1 
IEEE/ANSI
± 5% or ± 50 ms
DTL
td, ± 5% or ± 40 ms
Follower Delay
0.00, 0.01... 20 s
Reset
IEC/ANSI decaying, 0 s to 60 s
Inhibited by
Binary Input
Table 1-21
50LC/SOTF (Switch-On-To-Fault)
Setting range
1,2,....20xIn
Operate level
100% Is, ±5%
Disengaging time
< 50 ms
For more information about 50LC/SOTF, refer to Chapter 1 - 7SR45 Description of Operation,
Switch-On-To-Fault
©2018 Siemens Protection Devices
Chapter 3 Page 14 of 14
Chapter 4 - 7SR45 Data Communications Definitions
7SR45
Data Communication Definitions
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
© 2018 Siemens Protection Devices
Chapter 4 Page 1 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Contents
Section 1: Introduction ....................................................................................................................................... 3
Section 2: Physical Connection .......................................................................................................................... 4
2.1 Introduction ....................................................................................................................................... 4
2.2 USB Interface .................................................................................................................................... 4
2.3 RS485 Interface................................................................................................................................. 5
Section 3: Glossary............................................................................................................................................ 7
Section 4: IEC 60870-5-103 Definitions .............................................................................................................. 8
4.1 Introduction ....................................................................................................................................... 8
4.2 Cause of Transmission ...................................................................................................................... 8
4.2.1
Application Service Data Unit (ASDU) Type .......................................................................... 8
4.2.2
Point List .............................................................................................................................. 8
4.3 Event Function (FUN) & Information (INF) Numbers............................................................................ 9
4.4 Measurands .................................................................................................................................... 11
Section 5: Modbus Definitions .......................................................................................................................... 12
5.1 INTRODUCTION ............................................................................................................................. 12
5.2 MODBUS Register Data Types ........................................................................................................ 12
5.2.1
FLOAT_IEEE_754 ............................................................................................................. 12
5.2.2
FP_32BITS_3DP................................................................................................................ 12
5.2.3
UINT32 .............................................................................................................................. 12
5.2.4
UINT16 .............................................................................................................................. 13
5.2.5
EVENT .............................................................................................................................. 13
5.2.6
EVENTCOUNT .................................................................................................................. 14
5.2.7
TIME_METER .................................................................................................................... 14
5.2.8
STR32 and STR64 ............................................................................................................. 15
5.2.9
POINTS LIST ..................................................................................................................... 15
Appendix 1 ...................................................................................................................................................... 19
Appendix 2 ...................................................................................................................................................... 20
© 2018 Siemens Protection Devices
Chapter 4 Page 2 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Section 1: Introduction
This section describes how to use the Communication Interface with a control system or interrogating
computer.
The interface is compatible with control and automation systems using industry standard
communications protocols IEC 60870-5-103 and MODBUS-RTU.
Reydisp Evolution Software is available, for computers running Microsoft Windows™ to connect to
devices to provide operational information, post-fault analysis, setting interrogation and editing
facilities, etc.
The configuration software can be downloaded from our website http://www.siemens.com/energy.
This section specifies connection details and lists the information available through the individual
protocols.
NOTE:
The 7SR45 Argus Dual Powered Relay variant only supports the data communication.
© 2018 Siemens Protection Devices
Chapter 4 Page 3 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Section 2: Physical Connection
2.1
INTRODUCTION
The relay provides one “Front” USB communication interface located on the fascia and one RS485
located on the “Rear” as standard.
A detailed description of the ports are given below.
RS485:
This port can be used for IEC60870-5-103 and MODBUS-RTU communications
to a substation SCADA or integrated control system or for engineer remote
access. This port can also be used for connection to Reydisp software.
USB:
This port is used for IEC60870-5-103 (default setting) communication with the
Reydisp software.
Any or all serial ports can be mapped to the IEC60870-5-103 or MODBUS-RTU protocol at any one
time, protocols available will depend upon relay model.
When connecting to Reydisp Evolution software the protocol for the relevant port should be set to
IEC60870-5-103.
2.2
USB INTERFACE
The USB communication port is connected using a standard USB cable with a type B connection to
the relay and type A to the PC.
The PC will require a suitable USB driver to be installed; this will be carried out automatically when the
Reydisp software is installed. When the Reydisp software is running with the USB cable connected to
a device an additional connection is shown. Connections to these devices are not shown when they
are not connected.
The USB communication interface on the relay and its associated settings are located in the Data
communications menu. When connecting to Reydisp using this connection the default settings can be
used without the need to first change any settings.
Access to the communication settings for the USB port is only available from the relay front fascia via
the key pad setting menu COMMUNICATIONS MENU.
Setting
Name
USB
Protocol
Range/Options
Default
OFF
IEC60870-5-103
Reydisp software
requires IEC60870-5103
1
An address within the
range of the relevant
protocol must be given
to identify the relay.
Each relay in a network
must have a unique
address.
IEC60870-5-103
Setting
Notes
MODBUS-RTU
USB
Stn
Addr
USB Mode
0 - 254 for IEC60870-5-103
1 - 247 for Modbus RTU
Local
Local or Remote
Local or Remote
Remote
© 2018 Siemens Protection Devices
Chapter 4 Page 4 of 20
Chapter 4 - 7SR45 Data Communications Definitions
USB Type B
socket on Relay
USB Type A
Socket on PC
USB Type B
USB Type A
USB Data Cable
Figure 2-1 Communication to Front USB Port
2.3
RS485 INTERFACE
The 2-wire RS485 communication port is located on the rear of the relay and can be connected using
a suitable RS485 120 Ohm screened twisted pair cable.
The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485
master must support and use the Auto Device Enable (ADE) feature. The last device in the connection
must be terminated correctly in accordance with the master device driving the connection. This can be
done via the internal 120 ohm terminating resistor, which can be connected between (A) and (B) by
fitting an external wire loop between terminals 1 and 2 on the X4 connector.
The polarity of the signal terminals is marked as A and B in line with the RS485 standard. The polarity
is that when the bus is in the quiescent state and no communication is taking place, the A terminal is
more positive than B. This can be used to identify the polarity of any equipment to be connected,
typically measured at each terminal in turn to ground. Connection of the device to a termination
network at the end of the bus will also be to suit the quiescent state as shown in the diagram below.
The polarity marking is often found to be reversed or marked as +/- on other equipment so care is
required. If the devices are connected in reverse, communication to all devices will be disturbed but no
damage will occur. If problems are experienced during commissioning, the connections should be tried
in reverse.
The maximum number of relays that can be connected to the bus is 32.
The following settings, on the COMMUNICATIONS MENU, must be configured when using the RS485
interface.
Setting Name
Range/Options
Default
RS485
OFF
MODBUS-RTU
Protocol
IEC60870-5-103
The protocol used to
communicate on the
standard RS485
connection.
1
An address within the
range of the relevant
protocol must be
given to identify the
relay. Each relay in a
network must have a
unique address.
MODBUS-RTU
RS485
0 - 254 for IEC60870-5-103
Station
1 - 247 for Modbus RTU
Address
© 2018 Siemens Protection Devices
Setting
Notes
Chapter 4 Page 5 of 20
Chapter 4 - 7SR45 Data Communications Definitions
RS485
1200 2400 4800
Baud Rate
9600 19200 38400 57600
RS485
NONE
Parity
ODD
19200
The baud rate set on
all of the relays
connected to the
control system must
be the same as the
one set on the master
device.
NONE
The parity set on all
of the relays
connected to the
control system must
be the same and in
accordance with the
master device.
EVEN
RS485
Local
Local or Remote
Mode
Local or Remote
Remote
1
2
3
4
1
2
3
4
To Control
System
RS485 Screened
twisted pair
Rear terminals
RS485 Screened
twisted pair
Term
A/+
GND
B/-
Ext Wire loop to
Include line
terminating Res
Rear terminals
Figure 2-2 Communication to Multiple Devices using RS485 (Standard Port)
© 2018 Siemens Protection Devices
Chapter 4 Page 6 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Section 3: Glossary
Baud Rate
Data transmission speed.
Bit
The smallest measure of computer data.
Bits Per Second (bps)
Measurement of data transmission speed.
Data Bits
A number of bits containing the data. Sent after the start bit.
Parity
Method of error checking by counting the value of the bits in a sequence, and adding a parity bit to
make the outcome, for example, even.
Parity Bit
Bit used for implementing parity checking. Sent after the data bits.
RS485
Serial Communications Standard. Electronic Industries Association Recommended Standard Number
485.
Start Bit
Bit (logical 0) sent to signify the start of a byte during data transmission.
Stop Bit
Bit (logical 1) sent to signify the end.
USB
Universal Serial Bus standard for the transfer of data.
© 2018 Siemens Protection Devices
Chapter 4 Page 7 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Section 4: IEC 60870-5-103 Definitions
4.1
INTRODUCTION
This section describes the IEC 60870-5-103 protocol implementation in the relays. This protocol is
used for the communication with Reydisp software and can also be used for communication with a
suitable control system. The control system or local PC acts as the master in the system with the relay
operating as a slave responding to the master's commands. The implementation provides event
information, time synchronising, commands and measurands and also supports the transfer of
disturbance records.
This protocol can be set to use any or all of the relays hardware interfaces (USB, RS485) where fitted
and is the standard protocol used by the USB port. The relay can communicate simultaneously on all
ports regardless of protocol used.
The Station Address of the port being used must be set to a suitable address within the range 0 - 254
to enable communication. This can be set by the Communications Menu: -xxxxx Station Address
setting.
4.2
CAUSE OF TRANSMISSION
The cause of transmission (COT) column of the “Information Number and Function” table lists
possible causes of transmission for these frames. The following abbreviations are used:
Abbreviation
SE
GI
Loc
Rem
Ack
Nak
Description
spontaneous event
general interrogation
local operation
remote operation
command acknowledge
Negative command acknowledge
NOTE
Events listing a GI cause of transmission can be raised and cleared; other events are raised only.
4.2.1
Application Service Data Unit (ASDU) Type
The Application Service Data Unit (ASDU) column of the “Information Number and Function” table
lists the possible ASDUs returned for a point.
ASDU #
1
2
4
5
6
7
9
20
4.2.2
Description
Time tagged message (monitor direction)
Time tagged message (relative time) (monitor direction)
Time-tagged measurands with relative time
Identification message
Time synchronisation
General Interrogation Initialization
Measurands II
General command
Point List
The following sub-sections contain tables listing the data points available via the IEC60870-5-103
protocol.
Note that not all events are available on all relay models.
© 2018 Siemens Protection Devices
Chapter 4 Page 8 of 20
Chapter 4 - 7SR45 Data Communications Definitions
4.3
EVENT FUNCTION (FUN) & INFORMATION (INF) NUMBERS
FUN
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
INF
13
128
129
130
131
132
137
138
145
147
149
153
158
170
171
172
173
Description
Command Received
Cold Start
Warm Start
Re-Start
Expected Restart
Unexpected Restart
Clear Fault Records
Clear Event Records
CT Input
Aux Input
IRF
Battery Volts Low
Battery Volts Critical
General Alarm 1
General Alarm 2
General Alarm 3 *
General Alarm 4 *
60
4
Remote Mode
60
5
Service Mode
60
6
Local Mode
60
7
Local & Remote Mode
80
1
Binary Output 1
80
2
Binary Output 2
80
3
Binary Output 3 *
80
4
Binary Output 4 *
80
90
90
90
90
90
90
90
90
90
160
160
160
160
66
1
2
3
4
5
6
7
8
9
2
3
4
5
Trip Pulse Output
LED 1
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
LED 9
Reset FCB
Reset CU
Start/Restart
Power On
160
19
LEDs reset (Reset Flag & Outputs)
160
22
Settings changed
© 2018 Siemens Protection Devices
ASDU
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
20
1
20
1
20
1
20
1
20
1
20
1
20
1
20
1
1
1
1
1
1
1
1
1
1
5
5
5
1
1
20
1
COT
SE
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE
SE
SE, GI
SE, GI
SE, GI
GI
GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
GI
GI
GI
GI
GI
GI
GI
GI
GI
SE
SE
SE
SE, GI
SE
Ack, Nak
SE
Chapter 4 Page 9 of 20
Chapter 4 - 7SR45 Data Communications Definitions
160
23
Settings Group 1 Select
160
24
Settings Group 2 Select
160
160
160
160
160
160
160
160
160
160
160
160
160
160
160
160
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
183
255
255
255
27
28
29
30
64
65
66
67
69
70
71
84
90
91
92
93
0
10
11
12
13
14
15
17
19
21
225
239
240
241
242
243
0
0
0
Binary Input 1
Binary Input 2
Binary Input 3 *
Binary Input 4 *
Start/Pick-up L1
Start/Pick-up L2
Start/Pick-up L3
Start/Pick-up N
Trip L1
Trip L2
Trip L3
General Start/Pick Up
Trip I>
Trip I>>
Trip In>
Trip In>>
Data lost
51-1
50-1
51N-1
50N-1
51G-1
50G-1
50-2
50N-2
50G-2
50 LC
In Fault Current
Ia Fault Current
Ib Fault Current
Ic Fault Current
Ig Fault Current
Time Synchronisation
GI Initiation
End of GI
1
20
1
20
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
2
2
2
2
2
4
4
4
4
4
6
7
8
SE, GI
Ack, Nak
SE, GI
Ack, Nak
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE
SE
SE
SE
SE
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE, GI
SE
SE
SE
SE
SE
Time Synchronisation
GI
End of GI
NOTE:
* For 7SR4501 Dual Powered Relay variant, these parameters are not available.
NOTE:
For the list of events raised, refer to Appendix 2.
© 2018 Siemens Protection Devices
Chapter 4 Page 10 of 20
Chapter 4 - 7SR45 Data Communications Definitions
4.4
MEASURANDS
The following measurands EVT and INF numbers apply to this device.
FUN
INF
183
Description
Measurand IL1,2,3
--IL1 (2.4x)
IL2 (2.4x)
IL3 (2.4x)
148
ASDU
COT
9
Cyclic Refresh
rate 5
seconds
NOTE:
In the IEC103, message frames are separated by a silent interval of at least 3.5 character times. This
time interval is also called t3.5. This t3.5 delay needs to be provided by the IEC103 master for
response to another query.
7SR45 Argus Relay follows the below equation for satisfying the silent interval time.
tdelay required = 11 x 3.5/b
Where,
11 = bits
b = baud rate in bps
tdelay for 7SR45 = tdelay required + 10 ms tolerance
RTS
Data transmission
TXD
tp
tv
rdis
tn
ts
tp …… Pause time (pause before “RTS = ON”)
tv …… Setup time (transmission delay after “RTS = ON”)
tn …… Hold Time (pause time after sending before “RTS = “tOFF”)
ts …… Hold receiver disabled after “RTS = OFF”
rdis …… Disable receiver when using half duplex protocol
Note: Only active when “ts = 0”
Figure 2-3
Time Settings for Message Frame
tp or ts must be equal to tdelay for 7SR45.
© 2018 Siemens Protection Devices
Chapter 4 Page 11 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Section 5: Modbus Definitions
5.1
INTRODUCTION
This section describes the MODBUS-RTU protocol implementation in the relays. This protocol is used
for communication with a suitable control system.
This protocol can be set to use any or all of the relays hardware interfaces (USB, RS485) where fitted.
The relay can communicate simultaneously on all ports regardless of protocol used.
The Station Address of the port being used must be set to a suitable address within the range 1 - 247
to enable communication. This can be set by the Communications Menu: xxxxx Station Address
setting.
Definitions with shaded area are not available on all relay models.
5.2
5.2.1
MSB
Sign
5.2.2
MODBUS REGISTER DATA TYPES
FLOAT_IEEE_754
The float data type conforms to the IEEE 754 floating point definition. This specifies that 32
bits of data will be formatted as a sign bit in the most significant bit (MSB) followed by an 8 bit
exponent then a 23 bit mantissa, down to the least significant bit (LSB).
LSB
Exponent
Mantissa
FP_32BITS_3DP
The FP_32BITS_3DP is a 32 bit integer fixed point value, containing 3 decimal places of
information. It is used to send a real value to 3 decimal places as an integer. For example, if
the value in a device is 123.456 it will be sent as 123456. As it is an integer, negative numbers
are sent as 2's complement.
FP_32BITS_3DP & MODBUS
In this MODBUS implementation the 32 bit value is stored in 2 16 registers in Big-Endian
format. As an example, if we take the hex representation of 123456, we have 1E240h.
Assume this is stored in the registers 30001 and 30002, it would look as follows:
Address
30001
30002
Value
1
E240
On reception these two registers should be interpreted in the correct order as a 32 bit integer.
5.2.3
UINT32
The UINT32 is a signed 32 bit integer. As it is an integer, negative numbers are sent as 2's
complement.
UINT32 & MODBUS
In this MODBUS implementation the 32 bit value is stored in 2 16 bit registers in Big-Endian
format. As an example, if we take the hex representation of -123456, in 2's complement, we
have FFFE1DC0h. Assume this is stored in the registers 30001 and 30002, it would look as
follows:
Address
Value
30001
FFFE
30002
1DC0
On reception these two registers should be interpreted in the correct order as a 32 bit integer.
© 2018 Siemens Protection Devices
Chapter 4 Page 12 of 20
Chapter 4 - 7SR45 Data Communications Definitions
5.2.4
UINT16
The UINT16 is a signed 16 bit integer. As it is an integer, negative numbers are sent as 2's
complement.
UINT16 & MODBUS
In this MODBUS implementation the 16 bit value is stored in a 16 bit register in Big-Endian
format. As an example, if we take the hex representation of 5678 we have 162Eh. Assume
this is stored in the register 30001, it would look as follows:
Address
30001
Value
162E
On reception this register should be interpreted as a 16 bit integer.
Truncation
Calculations are performed as 32 bit. The 16 bit value is the lowest 16 bits of the 32 bit value.
Therefore, when values overflow the returned value is the lowest 16 bits of the calculated
value. For Example, if the value is 85400 = 14D98h, the value returned would be the lowest
16 bits = 4D98h which equals 19864.
5.2.5
EVENT
MODBUS does not define a method for extracting events; therefore a private method has
been defined based on that defined by IEC60870-5-103.
The EVENT register contains the earliest event record available. The event record is 8
registers (16bytes) of information, whose format is described below. When this record has
been read it will be replaced by the next available record. Event records must be read
completely; therefore the quantity value must be set to 8 before reading. Failing to do this will
result in an exception code 2. If no event record is present the exception code 2 will be
returned. The EVENT register should be polled regularly by the master for events.
The EVENTCOUNT register can be checked periodically to determine how many events are
stored.
The format of the event record is defined by the zero byte. It signifies the type of record which
is used to decode the event information. The zero byte can be one of the following.
Format
The format of the event record is defined by the zero byte. It signifies the type of record which
is used to decode the event information. The zero byte can be one of the following.
Type
1
2
4
Description
Event
Event with Relative Time
Measurand Event with Relative Time
© 2018 Siemens Protection Devices
Chapter 4 Page 13 of 20
Chapter 4 - 7SR45 Data Communications Definitions
The following table describes the fields in the event record.
Key
FUN
INF
DPI
ms L
ms H
Mi
Ho
RT L
RT H
F# L
F# H
Meas
Description
Function Type, as defined for IEC870-5-103.
Information Number, as defined for IEC870-5-103.
Measurand Event with Relative Time, values 1 = OFF, 2 = ON.
Time Stamp Milliseconds low byte.
Time Stamp Milliseconds high byte.
Time Stamp Minutes (MSB = invalid, time not set > 23 hours).
Time Stamp Hours (MSB = Summer time flag).
Relative Time low byte.
Relative Time high byte.
Fault Number low byte.
Fault Number high byte.
Measurand format R32.23, sent least significant byte first.
The following tables show the fields in the different event records as they are returned.
Byte
0
1
2
3
4
5
6
7
8
9
10
11
Content
1
0
FUN
INF
DPI
0
0
0
0
0
0
0
9
10
11
0
0
0
8
9
10
11
0
0
0
0
12
ms
L
13
ms
H
14
15
Mi
Ho
12
ms
L
13
ms
H
14
15
Mi
Ho
12
ms
L
13
ms
H
14
15
Mi
Ho
Event Type 1 Format.
Byte
0
1
2
3
4
Content
1
0
FUN
INF
DPI
5
RT
L
6
RT
H
7
F#
L
8
F#
H
Event Type 2 Format.
Byte
0
1
2
3
Content
1
0
FUN
INF
4
5
6
7
Meas
Event Type 4 Format.
5.2.6
EVENTCOUNT
The EVENTCOUNT register contains the current number of events in the relay's event buffer.
On reception this register should be interpreted as a 16 bit integer.
5.2.7
TIME_METER
The TIME_METER register contains the device's time. The time must be read or written in one
step; therefore the quantity should be 4 registers. Failing to do this will result in an exception
code 2. The time format is 8 bytes as follows.
The following table describes the fields in the time.
Key
ms L
ms H
Mi
Ho
Da
Mo
Ye L
Ye H
Description
Time Stamp Milliseconds low byte.
Time Stamp Milliseconds high byte.
Time Stamp Minutes (MSB = invalid, time not set > 23 hours).
Time Stamp Hours (MSB = Summer time flag).
Time Stamp Days
Time Stamp Months
Time Stamp Years low byte
Time Stamp Years high byte (Not Used).
© 2018 Siemens Protection Devices
Chapter 4 Page 14 of 20
Chapter 4 - 7SR45 Data Communications Definitions
The following table shows the fields in the time as they are returned.
Byte
Content
5.2.8
5.2.8.1
0
ms L
1
ms H
2
Mi
3
Ho
4
Da
5
Mo
6
Ye L
7
Ye H
STR32 and STR64
BITSTRING
A Bit-String (or Bit-Array) is a method of compactly storing a number of bits of data. In this
instance we store up to 16 bit values, for example the states of binary inputs, in a single 16 bit
register. The first bit value is stored in the Least Significant Bit (LSB) of the register. The 16th
value would be in the Most Significant Bit (MSB). Bit values can only be zero or one. Any
unused bits will be set to zero.
In this MODBUS implementation the 16 bit value is stored in a 16 bit register in Big-Endian
format. As an example, assume bits 1, 3, 9 and 12 are set. The binary representation of this
would be 00001001000001012 giving a hex representation of 0905h. Assume this is stored in
the register 30001, it would look as follows:
Address
30001
Value
0905
On reception this register should be interpreted as a 16 bit integer.
5.2.9
POINTS LIST
The information shown below is the default configuration. This can be modified using the
Communications Configuration Editor tool, refer section 9 for details.
5.2.9.1
Coils (Read Write Binary values)
Address
00001
00002
00003
00004
00100
00101
00102
00155
00156
00157
00158
00240
© 2018 Siemens Protection Devices
Description
Binary Output 1
Binary Output 2
Binary Output 3
Binary Output 4
LED Reset (Write only)
Settings Group 1
Settings Group 2
Remote mode
Service mode
Local mode
Local & Remote
Battery Data Reset (Write-Only)
Chapter 4 Page 15 of 20
Chapter 4 - 7SR45 Data Communications Definitions
5.2.9.2
Inputs (Read Only Binary values)
Address
10001
10002
10003
10004
10102
10103
10104
10105
10112
10113
10114
10115
10119
10122
10123
10124
10125
10126
10127
10129
10131
10133
10290
10291
10292
10293
10372
10390
10391
10392
10601
10602
10603
10604
10605
10606
10607
10608
10609
10800
10801
10802
10803
10804
10805
11120
© 2018 Siemens Protection Devices
Description
Binary Input 1
Binary Input 2
Binary Input 3
Binary Input 4
Remote mode
Service mode
Local mode
Local & Remote mode
A-Starter
B-Starter
C-Starter
General Starter
Start/Pick Up N
51-1
50-1
51N-1
50N-1
51G-1
50G-1
50-2
50N-2
50G-2
General Alarm 1
General Alarm 2
General Alarm 3
General Alarm 4
50 LC
Trip PhA
Trip PhB
Trip PhC
LED 1
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
LED 9
Cold Start
Warm Start
Re-Start
Power On
Expected Restart
Unexpected Restart
Trip Pulse Output
Chapter 4 Page 16 of 20
Chapter 4 - 7SR45 Data Communications Definitions
5.2.9.3
Registers
Address
30001
30002
30064
30066
30068
30070
30072
30074
30088
30090
30094
30096
30167
30168
30301
30303
30305
30313
30315
30341
30343
30345
Name
Event Count
Event
Phase A Primary Curr
Phase B Primary Curr
Phase C Primary Curr
Phase A Secondary Curr
Phase B Secondary Curr
Phase C Secondary Curr
In Primary Curr
In Secondary
Ig Primary
Ig Secondary
Fault Records
Event Records
Ia Last Trip
Ib Last Trip
Ic Last Trip
In Last Trip
Ig Last Trip
LED1-n
INP1-n
OUT1-n
Format
EVENTCOUNT
EVENT
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
UINT16
UINT16
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
BITSTRING
BITSTRING
BITSTRING
UINT32
Multiplier
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
30600
Device on battery power
30602
Backlight on battery power
UINT32
1
30604
BO operations on battery
power
UINT32
1
30606
BI operations on battery
power
UINT32
1
30618
Last fault info
UINT32
1
30620
Last fault phase info
UINT16
1
Description
Events Counter
8 Registers
Ia A
Ib A
Ic A
Ia A
Ib A
Ic A
In A
In A
Ig A
Ig A
Fault Records
Event Records
Ia Fault
Ib Fault
Ic Fault
In Fault
Ig Fault
LED 1-16 status
Input 1-16 status
Output 1-16 status
Device on battery
power
Backlight on
battery power
BO operations on
battery power
BI operations on
battery power
Last fault latch
information
Last fault phase
latch information
30618
00
50-1
16
X
15
50-2
X
50N-1
50N-2
X
X
X
X
X 50G-1
X
X
50G-2
X
51-1
X
51N-1
X
51G-1
X
X
X
X
X
X
X
X
X
50LC
31
X
30620
00
Ph-A
Ph-B
Ph-C
G
N
X
© 2018 Siemens Protection Devices
X
X
X
X
X
X
X
X
X
Chapter 4 Page 17 of 20
15
X
Chapter 4 - 7SR45 Data Communications Definitions
5.2.9.4
Holding Registers (Read Write Registers)
Address
40001
Name
Time
Format
TIME_METER
Multiplier
0.000000
Description
Time
NOTE:
In the RTU mode, message frames are separated by a silent interval of at least 3.5 character times. This time
interval is also called t3.5. This t3.5 delay needs to be provided by the Modbus RTU master for response to
another query.
7SR45 Argus Relay follows the below equation for satisfying the silent interval time.
tdelay required = 11 x 3.5/b
Where
11 = bits
b = baud rate in bps
tdelay for 7SR45 = tdelay required + 10 ms tolerance
RTS
Data transmission
TXD
tp
tv
rdis
tn
ts
tp …… Pause time (pause before “RTS = ON”)
tv …… Setup time (transmission delay after “RTS = ON”)
tn …… Hold Time (pause time after sending before “RTS = “tOFF”)
ts …… Hold receiver disabled after “RTS = OFF”
rdis …… Disable receiver when using half duplex protocol
Note: Only active when “ts = 0”
Figure 2-4
Time Settings for Message Frame
tp or ts must be equal to tdelay for 7SR45.
© 2018 Siemens Protection Devices
Chapter 4 Page 18 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Appendix 1
The operating mode of the device is set via the setting, or through a command sent to a communications port.
There are four options; Local, Remote, Local or Remote and Service.
The following table illustrates whether a function is Enabled (✔) or Disabled (✖) in each mode.
Operation Mode
Function
Local
Remote
Service
Control
Com1
✔ When Com1-Mode = Local
✔When Com1-Mode = Remote
×
Com2 (USB)
✔ When Com1-Mode =2 Local
✔When Com2-Mode = Remote
×
Binary Input (n)
✔ When BI (n) Mode = Local
✔ When BI (n) Mode = Remote
✔
✔
✔
×
✔
✔
×
IEC
✔
✔
×
MODBUS
✔
✔
✔
Binary Outputs
Reporting
Spontaneous
IEC
General Interrogation
Change Settings
Com1
✔When Com1-Mode = Local
✔When Com1-Mode = Remote
✔
Com2 (USB)
✔When Com2-Mode = Local
✔When Com2-Mode = Remote
✔
Historical Information
Event Records
✔
✔
✔
Fault Information
✔
✔
✔
Setting Information
✔
✔
✔
© 2018 Siemens Protection Devices
Chapter 4 Page 19 of 20
Chapter 4 - 7SR45 Data Communications Definitions
Appendix 2
Cold Start Raised
The cold start event is raised for the default setting conditions when the healthy battery is inserted.
Warm Start Raised
The warm start event is raised when the device goes from the sleep mode to wake up mode.
Restart
The restart event is raised whenever the expected restart or unexpected restart or cold start occurs. The restart
event is also raised.
Expected Restart
The expected event is raised when an expected restart occurs.
Unexpected Restart
The unexpected restart event is raised when an unexpected restart occurs.
Also, both the expected and unexpected restart cannot occur at the same time.
Power On
The power on event is raised when the battery is discharged completely.
© 2018 Siemens Protection Devices
Chapter 4 Page 20 of 20
Chapter 5 - 7SR45 Installation Guide
7SR45
Installation Guide
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
© 2018 Siemens Protection Devices
Chapter 5 Page 1 of 12
Chapter 5 - 7SR45 Installation Guide
Contents
Section 1: Installation Guide ............................................................................................................................... 3
1.1 Installation ......................................................................................................................................... 3
1.2 Replacing the Battery......................................................................................................................... 5
1.3 Post-Installation and Commissioning .................................................................................................. 7
1.4 7SR45 Relay Applications .................................................................................................................. 9
List of Figures
Figure 1-1
Figure 1-2
Figure 1-3
Figure 1-4
Figure 1-5
Figure 1-6
Figure 1-7
Figure 1-8
Figure 1-9
Figure 1-10
Figure 1-11
Figure 1-12
Figure 1-13
Figure 1-14
Figure 1-15
Figure 1-16
7SR45 Argus Dual Powered Relay Clearance for Terminal Wiring ................................................ 3
Panel Cut-out .............................................................................................................................. 4
Removing the Battery Cover ........................................................................................................ 5
Removing the Damaged Battery .................................................................................................. 5
Removing the Damaged Battery .................................................................................................. 6
Placing the Battery Cover ............................................................................................................ 6
Removing the Battery Cover ........................................................................................................ 7
Flipping the Battery Cover............................................................................................................ 7
Removal of Paper Strip................................................................................................................ 8
Placing the Battery Cover ............................................................................................................ 8
7SR45 Argus Relay for RMU Application...................................................................................... 9
7SR45 Self Powered Relay for RMU Application .......................................................................... 9
7SR45 Self Powered Relay for Distribution Transformer Application............................................ 10
7SR45 Argus Relay for Distribution Transformer Application ....................................................... 11
7SR45 Argus Relay with Phase and CBCT Measurement Application ......................................... 12
7SR45 Argus Relay with Earth Fault Application ......................................................................... 12
© 2018 Siemens Protection Devices
Chapter 5 Page 2 of 12
Chapter 5 - 7SR45 Installation Guide
Section 1: Installation Guide
1.1
Installation
Execute the following procedure to install the 7SR45 Argus Relay:
1.
Create a slot of dimensions as shown in Figure 1-2 to house the relay in the protection panel.
2.
Flush the rear-side of relay into the protection panel cut-out.
3.
Fasten the relay using the four M4x20 Pan Phillips SS screws with nut provided in the 7SR45 packing
box to the protection panel/cubicle.
4.
Carry-out all other installation steps/wiring internally from the protection panel.
5.
In the rear terminal of the relay, execute the wiring process as mentioned in scheme requirements.
Refer figure for more details about the terminal connector diagram. Refer the Table 1-1 for the
recommended terminal lugs to be used.
6.
The earthing cable should be wired using a non-stranded cable of 2.5 mm /4 mm and this should be
terminated in the shortest possible path to the earth terminal/bus bar in panel or cubicle.
7.
Maintain a minimum clearance from the relay as given in Figure 1-1 to ensure safety and accidental
touch of terminals. In case of work area restricted in a cubicle, suitable protective terminals to
be provided in the cubicle.
2
2
NOTE:
15
188
203
Figure 1-1
156
149
The earthing point (E) of auxiliary supply is connected to the ground (GND) point of the relay. The earth
connection of relay casing should be solidly connected to the panel earth.
30
30 mm clearance for
Terminal wiring
7SR45 Argus Dual Powered Relay Clearance for Terminal Wiring
© 2018 Siemens Protection Devices
Chapter 5 Page 3 of 12
Chapter 5 - 7SR45 Installation Guide
4.5 - 4 Holes
98.5
78
168
159
4.5
10.25
Figure 1-2
Panel Cut-out
Table 1-1
7SR4501/7SR4502 Argus Self/Dual Powered
Recommended Terminal Lugs Specifications
Terminal Blocks
Current Inputs
Auxiliary Supply
Rear Communication
Port
Front
Communication Port
Binary Input/ Binary
Output/Pulse Output/
Flag Output
Ground Terminal
Type/Cable Specifications
Manufacturer/
Part Number
TE connectivity PIDG Series insulated tin plated
Crimp ring terminal, M3.5 Stud size, 2.6 mm² to
6.6 mm², 12 AWG
Insulated tin plated crimp Pin connector, 2.6 mm² to
6.6 mm², 12 AWG to 10 AWG
TE Connectivity Mfr. Part No.
2-327960-1 or equivalent
Pin type lug/1.5 mm2 control cable
End sleeve
3D-8011H or equivalent
End sleeve
3D-8011H or equivalent
USB, Type B
Tyco/974329-1 or equivalent
Insulated tin plated crimp Pin connector, 2.6 mm² to
6.6 mm², 12 AWG to 10 AWG
End sleeve
3D-8011H or equivalent
Tin plated crimp ring Terminal, M3 stud size,
4 mm² to 6 mm², 12 AWG to 10 AWG, Yellow
RS Stock No. 613-9334 or
equivalent Mfr. Part no.
RVY5-3.2
© 2018 Siemens Protection Devices
Chapter 5 Page 4 of 12
Chapter 5 - 7SR45 Installation Guide
1.2
Replacing the Battery
You can replace the 7SR45 Argus Relay battery when it is damaged or exhausted. To replace the battery, follow
the procedure:
1. Remove the 7SR45 Argus Relay battery cover.
Figure 1-3
Removing the Battery Cover
2. Remove the damaged or exhausted battery from the battery clip.
Figure 1-4
© 2018 Siemens Protection Devices
Removing the Damaged Battery
Chapter 5 Page 5 of 12
Chapter 5 - 7SR45 Installation Guide
3. Insert the new battery in the battery clip with the correct polarity as indicated.
Figure 1-5
Removing the Damaged Battery
4. Fit the battery cover again and screw it to the housing.
Figure 1-6
Placing the Battery Cover
5. After the replacement of a new battery and in the absence of auxiliary power, phase current, low input current,
and without USB connection, test the relay by pressing BAT ON/OFF key to confirm the relay functionality.
!
CAUTION
Risk of fire if the battery is replaced with incorrect type or polarity. Dispose of used batteries according
to instructions.
NOTE:
Its is recommended to keep the spare battery on a non-conductive surface to avoid any terminal shortages.
© 2018 Siemens Protection Devices
Chapter 5 Page 6 of 12
Chapter 5 - 7SR45 Installation Guide
1.3
Post-Installation and Commissioning
Execute the following procedure after installation and commissioning of the 7SR45 Argus Relay.
1.
Open the 7SR45 Argus Relay battery cover.
Figure 1-7
2.
Removing the Battery Cover
Flip the 7SR45 Argus Relay battery cover.
Figure 1-8
© 2018 Siemens Protection Devices
Flipping the Battery Cover
Chapter 5 Page 7 of 12
Chapter 5 - 7SR45 Installation Guide
3.
To start the 7SR45 Argus Relay, remove the paper strip between the battery clip and battery.
Figure 1-9
Removal of Paper Strip
4. Fit the battery cover again and screw it to the housing.
Figure 1-10
© 2018 Siemens Protection Devices
Placing the Battery Cover
Chapter 5 Page 8 of 12
Chapter 5 - 7SR45 Installation Guide
1.4
7SR45 Argus Relay Applications
Relay
Applications
Description
7SR45
Argus Relay
for RMU
Application
1. CT circuits shown are connected
to 1 A or 5 A of 7SR45 Argus
relay.
Connections
IL1 IL2 IL3
7SR45
2. CT and Earth connections are
typical only.
4. Application shows the use of
50/51/50N/51N/50LC protection
functions.
1. CT circuits shown are connected
to 1 A or 5 A of 7SR45 Argus
relay.
2. CT and Earth connections are
typical only.
3. Measures the phase current and
earth current of the Primary CT
only.
4. Application shows the use of
50/51/50N/51N/ 50LC/50G/51G
protection functions.
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
Figure 1-12
© 2018 Siemens Protection Devices
N
BO
IL3
IL4
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
7SR45 Self
Powered
Relay for
RMU
Application
24 V – 60 V DC
60 V – 240 V DC
IL2
3. Measures the phase current of
the Primary CT only.
Figure 1-11
L
IL1
Standard release
Battery
7SR45 Argus Relay for RMU Application
IL1 IL2 IL3
7SR45
IL1
IL2
IL3
PO
+ ve
- ve
IL4
24 V DC, 0.1 Ws
7SR45 Self Powered Relay for RMU Application
Chapter 5 Page 9 of 12
Chapter 5 - 7SR45 Installation Guide
Relay
Applications
7SR45 Self
Powered
Relay for
Distribution
Transformer
Application
Description
Connections
1. CT circuits shown are connected
to 1 A or 5 A of 7SR45 Argus
relay.
IL1 IL2 IL3
7SR45
IL1
2. CT and Earth connections are
typical only.
IL2
3. Measures the phase current and
earth current of the Primary CT
only.
IL3
4. Application shows the use of
50/51/50N/51N/ 50LC/50G/51G
protection functions.
PO
+ ve
- ve
IL4
5. Remote trip via binary input is
possible.
24 V DC, 0.1 Ws
Distribution
Transformer
IL1 IL2 IL3 N
Figure 1-13
© 2018 Siemens Protection Devices
7SR45 Self Powered Relay for Distribution Transformer Application
Chapter 5 Page 10 of 12
Chapter 5 - 7SR45 Installation Guide
Relay
Applications
7SR45
Argus Relay
for
Distribution
Transformer
Application
Description
1. CT circuits shown are
connected to 1 A or 5 A of
7SR45 Argus relay.
Connections
IL1 IL2 IL3
L
7SR45
IL1
2. CT and Earth connections are
typical only.
N
IL2
3. Measures the phase current
and earth current of the Primary
CT only.
IL3
4. Application shows the use of
50/51/50N/51N/50LC/50G/51G
protection functions.
PO
+ ve
- ve
IL4
5. Remote trip via binary input is
possible.
24 V DC, 0.1 Ws
Distribution
Transformer
230 V AC
IL1 IL2 IL3 N
Low
Voltage
Figure 1-14
© 2018 Siemens Protection Devices
7SR45 Argus Relay for Distribution Transformer Application
Chapter 5 Page 11 of 12
Chapter 5 - 7SR45 Installation Guide
Relay
Applications
7SR45 Argus
Relay with
Phase and
CBCT
Measurement
Description
Connections
IL1 IL2 IL3
1. CT circuits shown are
connected to 1 A or 5 A of
7SR45 Argus Relay.
7SR45
2. CT and Earth connections are
typical only.
BO
IL4
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
Standard release
Battery
7SR45 Argus Relay with Phase and CBCT Measurement Application
1. CT circuits shown are
connected to 1 A or 5 A of
7SR45 Argus Relay.
2. CT and Earth connections are
typical only.
3. Measures the earth current of
the Primary CT only.
4. Application shows the use of
50G/51G protection functions.
5. Remote trip via Communication
(through BO with Auxiliary input
present) and Binary input is
possible.
Figure 1-16
© 2018 Siemens Protection Devices
N
IL3
4. Application shows the use of
50/51/50N/51N/50LC/50G/51G
protection functions.
7SR45 Argus
Relay with
Earth Fault
Application
24 V – 60 V DC
60 V – 240 V DC/AC
IL2
3. Measures the phase current
and earth current of the Primary
CT only.
Figure 1-15
L
IL1
IL1 IL2 IL3
7SR45
L
IL1
24 V – 60 V DC
60 V – 240 V DC/AC
N
IL2
IL3
BO
IL4
Standard release
Battery
7SR45 Argus Relay with Earth Fault Application
Chapter 5 Page 12 of 12
Chapter 6 - 7SR45 Commissioning and Maintenance Guide
Contents
Section 1: Commissioning and Maintenance Guide............................................................................................. 3
1.1 Troubleshooting................................................................................................................................. 3
© 2018 Siemens Protection Devices
Chapter 6 Page 2 of 3
Chapter 6 - 7SR45 Commissioning and Maintenance Guide
Section 1: Commissioning and Maintenance Guide
1.1
Troubleshooting
This section provides the common problems of 7SR4501/7SR4502 Relay and the recommended solution to
resolve the problem.
Observation
Relays will not
communicate in a ring
network
Action
• Check that all relays are powered up with auxiliary power supply.
Relay does not power
up
• Check the correct auxiliary AC or DC voltage is applied and the
polarity is correct * (or)
• Check the polarity of rear communication terminal and connection.
• Check that all relays have unique addresses.
• Check the phase connections based on the terminal diagram and if
CT power is applied (or)
• Check USB port if the relay is connected with USB power (or)
• Check the battery healthy voltage if the relay is powered with battery
power.
Relay won’t accept the
password
• The password entered is wrong. Enter the correct password.
• If correct password has been forgotten, note down the numeric code
displayed at the Change Password screen.
• To retrieve the password, communicate this numeric code to a
Siemens Customer representative.
Protection Healthy and
Trip Ready LED
OFF/LCD not displaying
Cannot communicate
with the relay and
Reydisp evolution
1.
In the absence of auxiliary voltage, check the minimum phase
currents.
2.
Check the error messages and the error codes in the Instrument
Mode.
• Check the communication cable is connected properly.
• Check that the USB driver is installed correctly.
• In Reydisp Evolution, verify that “Do NOT Check Communications
Connection” is selected in the Advanced properties.
• In Reydisp Evolution, check that the Relay Address is set as “1” in the
Relay menu.
• Ensure that IEC 60870-5-103 is specified for the connected port
(COM1 or COM2). *
Binary inputs do not
work
• Check that the correct DC voltage is applied and that the polarity is
correct.
• Check that the binary input settings such as the pick-up and drop-off
timers and the status inversion function are correctly set.
• Check the relay mode (Local or Remote) and binary input mode
(Local or Remote) configured in the settings.
Low/Critical battery
Indication
• Check the paper strip between battery clip and battery.
• Check the battery is connected with the proper polarity.
• Check the battery healthy voltage.
If the above troubleshooting checklist does not help in correcting the problem please contact the local Siemens
office or contact customer support:
Phone: +49 180/524 8437 (24hrs)
Fax: +49 180/524 2471
E-mail: support.energy@siemens.com
© 2018 Siemens Protection Devices
Chapter 6 Page 3 of 3
Chapter 7 - 7SR45 Applications Guide
7SR45
Applications Guide
Document Release History
This document is issue 2018/04. The list of revisions up to and including this issue is:
2018/04
Sixth Issue
2017/08
Fifth Issue
2017/01
Fourth Issue
2016/10
Third Issue
2016/09
Second Issue
2015/08
First Issue
©2018 Siemens Protection Devices
Chapter 7 Page 1 of 11
Chapter 7 - 7SR45 Applications Guide
Contents
Section 1: Current Transformer Requirements .................................................................................................... 3
1.1 Time Delayed Overcurrent (51/51G/51N) ............................................................................................ 7
1.2 Selection of Overcurrent Characteristics ............................................................................................. 8
1.2.1
Reset Delay ......................................................................................................................... 9
1.3 Instantaneous Overcurrent (50/50G/50N) ......................................................................................... 10
1.4 Inrush Response.............................................................................................................................. 11
List of Figures
Figure 1-1
Figure 1-2
Figure 1-3
Figure 1-4
Figure 1-5
Figure 1-6
Figure 1-7
Burden of the Relay for Different Currents ..................................................................................... 5
IEC NI Curve with Time Multiplier and Follower DTL Applied.......................................................... 7
IEC NI Curve with Minimum Operate Time Setting Applied ............................................................ 8
Reset Delay ................................................................................................................................. 9
General Form of DTL Operate Characteristic............................................................................... 10
Inrush Currents Waveform .......................................................................................................... 11
Inrush Currents Waveform .......................................................................................................... 11
©2018 Siemens Protection Devices
Chapter 7 Page 2 of 11
Chapter 7 - 7SR45 Applications Guide
Section 1: Current Transformer Requirements
7SR45 Self Powered/Dual Powered Non-Directional Overcurrent and Earth Fault Relay uses the current inputs to
energize the relay.
Higher ohmic burdens in the current transformer (CT) secondary circuit results in greater saturation
of the core and introduces larger errors in the secondary current waveform. For a given secondary current, it
requires more voltage from the CT for a higher burden.
The total burden on the CT is the vector sum of the CT winding resistance, the connecting lead resistance, the
impedance of any auxiliary CTs, and the impedance of the connected relays and meters.
After the ohmic burden is determined, the next step in predicting CT performance is to determine the required CT
excitation voltage or secondary limiting voltage by multiplying the calculated total ohmic burden by the accuracy
limit factor (ALF) and rated secondary current.
The secondary limiting excitation voltage (EALF) is given by the following expression:
EALF = ALF * Isr * (Rct + Rbn)
Where,
ALF – Accuracy Limiting Factor
Isr – Rated Secondary current of CT (A)
Rct – CT Winding resistance (Ω)
Rbn – Rated Burden of CT (Ω)
If the secondary limiting excitation voltage (EALF) calculated exceeds the knee point voltage of the connected CT,
the CT may get saturated.
To select a proper CT, the accuracy limit factor (ALF) at a given burden needs to be considered. The ALF needs
to be checked for entire range of currents the relay is expected to operate. For proper operation of the CT, the
following condition needs to be fulfilled.
ALF * Isr * (Rct + Rbn) ≥ Is * (Rct + Rb)
So,
ALF = Is *(R ct + R b )
Isr *(Rct + Rbn)
Is – Actual Secondary current of CT (A)
Rb – Actual secondary burden of CT (Ω) (Includes Burden of the relay (Rrel) and resistance (Rl) of the cable
between CT and Relay.
The burden of 7SR45 relay depends on the input current. The impedance of the relay is inversely proportional to
the input current. Based on the field conditions, it is recommended to select the primary CT turns ratio should be
at least 10 %xIn to reduce the dependency of the internal battery.
The following graphs show the impedance of the relay for different currents when the relay is powered through a
single phase current input.
NOTE:
When all the three phases are available, the burden on each CT reduces.
©2018 Siemens Protection Devices
Chapter 7 Page 3 of 11
Chapter 7 - 7SR45 Applications Guide
©2018 Siemens Protection Devices
Chapter 7 Page 4 of 11
Chapter 7 - 7SR45 Applications Guide
Figure 1-1
©2018 Siemens Protection Devices
Burden of the Relay for Different Currents
Chapter 7 Page 5 of 11
Chapter 7 - 7SR45 Applications Guide
Sample Calculation:
CT Ratio
:
100/1
Rated CT Burden (Rbn)
:
2.5 VA (Rbn = 2.5 Ω for 1A secondary current)
CT winding resistance (Rct)
:
0.5 Ω
Rated Secondary Current (Isr)
:
1A
Case 1:
In the absence/loss of auxiliary power, the minimum phase current required for the relay operation in single phase
= 0.2 In (Is = 0.2A for rated current of 1 A)
ALF ≥ 0.2 * (0.5 +28.5)
1 * (0.5 + 2.5)
Rb = 28.5 at 0.2 A (Refer to Impedance graphs for current >1A (Nominal current, In = 1A)
ALF ≥ 1.933
Case 2:
Fault current = 20 A
ALF ≥ 20 * (0.5 + 0.49)
1 * (0.5 + 2.5)
Rb = 0.49 at 20 A (Refer to Impedance graphs for current >1A (Nominal current, In=1A)
ALF ≥ 6.6
The typical accuracy limit factor would be ALF = 10
The calculation shown above is an example. To select an appropriate CT, similar calculation needs to be done
with the actual parameters.
Recommended CTs:
Considering the CTs are connected to 7SR45 Argus Relay only and the distance between CTs and 7SR45 Argus
Relay (typically 3 m) is short, the following are the recommended CTs to be used:
•
2.5 VA, 5P10 or 5P20 for In = 1 A
•
2.5 VA, 5P20 for In = 5 A
NOTE:
For safe operation of the 7SR45 Argus Relay, the maximum power delivered to the relay is 1000 VA for 1 s.
Moreover, it is not recommended to overload the relay above 1000 VA for multiple times.
For more information, refer to Short Time Thermal Withstand.
©2018 Siemens Protection Devices
Chapter 7 Page 6 of 11
Chapter 7 - 7SR45 Applications Guide
1.1
Time Delayed Overcurrent (51/51G/51N)
The 51-n characteristic element provides a number of time/current operate characteristics. The element can be
defined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic. If an
IDMTL characteristic is required, then IEC, ANSI/IEEE and a number of manufacturer specific curves are
supported.
IDMTL characteristics are defined as “Inverse” because their tripping times are inversely proportional to the Fault
Current being measured. This makes them particularly suitable to grading studies where it is important that only
the Relay(s) closest to the fault operate. Discrimination can be achieved with minimised operating times.
To optimise the grading capability of the relay additional time multiplier, ‘Follower DTL’ (Fig 1 2) or ‘Minimum
Operate Time’ (Fig. 1 3) settings can be applied.
1000.00
1000.00
100.00
100.00
10.00
Operating Time (Seconds)
Operating Time (Seconds)
10.00
Time Multiplier = 1
Follower
DTL
1.00
1.00
Increasing
Time
Multiplier
0.10
0.10
0.01
0.01
1
10
100
Current (x Is)
Figure 1-2
©2018 Siemens Protection Devices
1000
1
10
100
1000
Current (x Is)
IEC NI Curve with Time Multiplier and Follower DTL Applied
Chapter 7 Page 7 of 11
Chapter 7 - 7SR45 Applications Guide
1000.00
OPERATE
ZONE
100.00
Operating Time (Seconds)
10.00
Min Operate Time = 4sec
IEC NI Curve: TM = 1
1.00
0.10
0.01
1
10
100
1000
Current (x Is)
Figure 1-3
IEC NI Curve with Minimum Operate Time Setting Applied
To increase sensitivity, dedicated Earth fault elements are used. There should be little or no current flowing to
earth in a healthy system so such relays can be given far lower pick-up levels than relays which detect excess
current ( > load current) in each phase conductor. Such dedicated earth fault relays are important where the fault
path to earth is a high-resistance one (such as in highly arid areas) or where the system uses high values of
earthing resistor / reactance and the fault current detected in the phase conductors will be limited.
1.2
Selection of Overcurrent Characteristics
The characteristic curve shape is selected to be the same type as the other relays on the same circuit or to grade
with items of plant e.g. fuses or earthing resistors.
The application of IDMTL characteristic is summarised in the following table:
Table 1-1
Application of IDMTL Characteristics
OC/EF Curve Characteristic
IEC Normal Inverse (NI)
Application
Generally applied
IEEE/ANSI Moderately Inverse
(MI)
IEC Very Inverse (VI)
IEEE/ANSI Very Inverse (VI)
IEC Extreme Inversely (EI)
Used with high impedance paths where there is a significant difference
between fault levels at protection points
Grading with Fuses
IEEE/ANSI Extremely Inverse
(EI)
IEC Long Time Inverse (LTI)
©2018 Siemens Protection Devices
Used to protect transformer earthing resistors having long withstand times
Chapter 7 Page 8 of 11
Chapter 7 - 7SR45 Applications Guide
1.2.1 Reset Delay
The increasing use of plastic insulated cables, both conventionally buried and aerial bundled conductors, have
given rise to the number of flashing intermittent faults on distribution systems. At the fault position, the plastic
melts and temporarily reseals the faulty cable for a short time after which the insulation fails again. The same
phenomenon has occurred in compound-filled joint boxes or on ‘clashing’ overhead line conductors. The
repeating occurrence of the fault can cause electromechanical disc relays to “ratchet” up and eventually trip the
faulty circuit if the reset time of the relay is longer than the time between successive faults.
To mimic an electromechanical relay the relay can be user programmed for an IEC/ANSI DECAYING
characteristic when an ANSI operate characteristic is applied. Alternatively a DTL reset (0 to 60 seconds) can be
used with other operate characteristics.
For protection of cable feeders, it is recommended that a 60 s DTL reset be used.
On overhead line networks, particularly where reclosers are incorporated in the protected system, instantaneous
resetting is desirable to ensure that, on multiple shot reclosing schemes, correct grading between the source
relays and the relays associated with the reclosers is maintained.
R3
R1
R2
FAULT
Clashing
conductors or
re-sealing cable
TRIP
Time
TRIP
Time
Figure 1-4
©2018 Siemens Protection Devices
Argus (DTL Reset)
Argus (Inst. Reset)
% of Algorithm
Disc Travel
Electro-mechanical Relay
Reset Delay
Chapter 7 Page 9 of 11
Chapter 7 - 7SR45 Applications Guide
1.3
Instantaneous Overcurrent (50/50G/50N)
Each instantaneous element has an independent setting for pick-up current and a follower definite time lag (DTL)
which can be used to provide time grading margins, sequence co-ordination grading or scheme logic. The
“instantaneous” description relates to the pick-up of the element rather than its operation.
Operating time
Operating Characteristic:
50-n
Current
Figure 1-5
General Form of DTL Operate Characteristic
Instantaneous elements can be used in current graded schemes where there is a significant difference between
the fault current levels at different relay point. The Instantaneous element is set to pick up at a current level above
the maximum Fault Current level at the next downstream relay location, and below its own minimum fault current
level. The protection is set to operate instantaneously and is often termed ‘Highset Overcurrent’. A typical
application is the protection of transformer HV connections – the impedance of the transformer ensuring that the
LV side has a much lower level of fault current.
The 50-n elements have a very low transient overreach i.e. their accuracy is not appreciably affected by the initial
dc offset transient associated with fault inception.
©2018 Siemens Protection Devices
Chapter 7 Page 10 of 11
Chapter 7 - 7SR45 Applications Guide
1.4
Inrush Response
nd
7SR45 Argus Relay is designed with immunity against inrush currents (15% of 2 Harmonic) up to 3 times of
peak current with fundamental Component (50 Hz/60Hz) inside the currents less than 95% of Iset.
During charging of transformer in the distribution system, the inrush current will be generated and the relay will
not respond to the Inrush current up to 3 times of its peak value, since it’s not a fault condition.
For example, in the below waveform the inrush currents have been simulated for 3 times of peak values of the
phase overcurrent setting (51-1: Iset – 0.9 A) and the relay response for the inrush current is monitored. The
second harmonic content of the simulated inrush currents is 15% and the relay fundamental current component is
less 0.85 A (<95% Iset).
Ir/A
2.0
1.0
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
t/s
0.0
-1.0
-2.0
Figure 1-6
Inrush Currents Waveform
General Pickup
Trip
1.00
1.05
1.10
Figure 1-7
1.15
1.20
1.25
1.30
1.35
1.40
1.45
Inrush Currents Waveform
In the waveform, fundamental component of 50 Hz signal is less than 0.85 A and peak current is typically 3 times
of the Iset. Relay will not initiate trip signal for this condition.
©2018 Siemens Protection Devices
Chapter 7 Page 11 of 11
t/s
Siemens Protection Devices Limited
P.O. Box 8, North Farm Road
Hebburn, Tyne & Wear
NE31 1TZ
United Kingdom
Phone: +44 (0)191 401 7901
Fax: +44 (0)191 401 5575
E-mail: marketing.spdl.gb@siemens.com
EMEA-T10023-00-76GB
April 2018
For enquires please contact our Customer Support Center
Phone: +49 180/524 8437 (24hrs)
Fax:
+49 180/524 2471
E-mail: support.energy@siemens.com
Subject to change without notice.
Unrestricted Siemens Protection Devices Limited
1