GES 34130
Technical Specification of GECOL
Ring Main Units with T-off CB
(Revision history)
- Issued on: Jan. 01, 2007
Amended Jan.01, 2013
Amended Jan.31, 2013
General Electricity Company of Libya
Contents
1
SCOPE AND SERVICE CONDITIONS.............................................................................................. 5
1.1
SCOPE .................................................................................................................................................. 5
1.2
SERVICE CONDITIONS ........................................................................................................................... 5
1.2.1
Normal service conditions for indoor RMUs ............................................................................. 5
1.2.2
Normal service conditions for outdoor RMUs ........................................................................... 5
1.2.3
Unusual service conditions ........................................................................................................ 6
2
NORMATIVE REFERENCES ............................................................................................................. 6
3
DEFINITIONS ....................................................................................................................................... 7
4
3.1
NON-EXTENSIBLE RMU ....................................................................................................................... 7
3.2
EXTENSIBLE RMU ............................................................................................................................... 7
KINDS AND RATINGS......................................................................................................................... 7
4.1
4.1.1
Kinds of RMU according to extensibility .......................... Ошибка! Закладка не определена.
4.1.2
Kinds of RMU according to insulation material ........................................................................ 7
4.1.3
Specification numbers................................................................................................................ 8
4.2
5
KINDS .................................................................................................................................................. 7
RATINGS............................................................................................................................................... 9
4.2.1
Rated voltage ............................................................................................................................. 9
4.2.2
Rated insulation level ................................................................................................................ 9
4.2.3
Rated duration of short-circuit .................................................................................................. 9
4.2.4
Rated frequency ......................................................................................................................... 9
4.2.5
Rated normal current and temperature rise............................................................................... 9
4.2.6
Rated short-time withstand current ........................................................................................... 9
4.2.7
Rated peak withstand current .................................................................................................. 10
4.2.8
Rated line and cable-charging breaking currents .................................................................... 10
4.2.9
Rated pressure of compressed gas supply for insulation ......................................................... 10
REQUIREMENTS ............................................................................................................................... 10
5.1
REQUIRED STRUCTURE....................................................................................................................... 10
5.1.1
General requirements .............................................................................................................. 10
5.1.2
Enclosure ................................................................................................................................. 10
5.1.3
Degree of protection (IP code) by enclosures .......................................................................... 10
5.1.4
Operation device(s) .................................................................................................................. 11
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5.1.5
Operation counter..................................................................................................................... 11
5.1.6
Terminations and cable boxes................................................................................................... 11
5.1.7
Glands, only for RMU with EFI ............................................................................................... 11
5.1.8
Bushings ................................................................................................................................... 11
5.1.9
Bus-bars................................................................................................................................... 12
5.1.10
Flammability ....................................................................................................................... 12
5.1.11
Earthing of RMUs .................................................................................................................... 12
5.1.12
Interlock .............................................................................................................................. 12
5.1.13
Additional requirement for extensible RMUs ...................................................................... 13
5.1.14
Mimic diagram .................................................................................................................... 13
5.1.15
Dimensions ......................................................................................................................... 13
5.2
REQUIRED PERFORMANCE .................................................................................................................. 13
5.2.1
Ring switch .............................................................................................................................. 13
5.2.2
Circuit breaker ......................................................................................................................... 14
5.2.3
Voltage presence indicating systems ........................................................................................ 14
5.2.4
Fault indicating device ............................................................................................................ 14
5.2.5
FCI (fault current indicator) combined with CT, if requested by GECOL............................... 15
5.2.6
EFI (earth fault indicator) combined with ZCT, if requested by GECOL ................................ 15
5.2.7
Cable testing facility ................................................................................................................ 15
5.2.8
Fluid pressure gauge ............................................................................................................... 16
5.2.9
Manual operation device ......................................................................................................... 16
5.2.10
Requirements for gases in RMUs ........................................................................................ 16
5.2.11
Electromagnetic compatibility (EMC) ..................................................................................... 16
5.2.12
Provision for motorizing the RMU for remote control ........................................................ 16
There shall be all provisions facilitating installing of motors, driven actuators, auxiliary relays and all
other accessories
for automatic remote operation and signaling for the load break switches and the t
eeoff circuit breaker of the RMU. Manufacturer shall provide all drawings for GECOL to enable future in
stalling of remote control equipments. Also all ...................................................................................... 16
6
7
TESTS ................................................................................................................................................... 16
6.1
TYPE TESTS ........................................................................................................................................ 16
6.2
ROUTINE TESTS .................................................................................................................................. 17
RATING PLATE .................................................................................................................................. 18
7.1
REQUIREMENTS FOR RATING PLATE .................................................................................................... 18
7.2
INFORMATION OF RATING PLATE ......................................................................................................... 18
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8
MARKING ........................................................................................................................................... 19
8.1
POSITION-INDICATING DEVICE ........................................................................................................... 19
8.1.1
Letter type and colors of the position-indicating device .......................................................... 19
8.1.2
Symbols and letters of the position-indicating device.............................................................. 19
8.2
SPRING-CHARGE INDICATOR (ONLY FOR SPRING OPERATION TYPE)..................................................... 20
8.2.1
Letter type and colors of the spring-charge indicator ............................................................. 20
8.2.2
Symbols and letters of the spring charge indicator ................................................................. 20
9
PACKING AND DELIVERY .............................................................................................................. 20
10
DOCUMENTS AND CERTIFICATES .............................................................................................. 22
10.1
10.1.1
Service conditions ............................................................................................................... 22
10.1.2
Rated values and characteristics ........................................................................................ 22
10.2
11
INFORMATION TO BE GIVEN BY GECOL ........................................................................................ 22
INFORMATION TO BE GIVEN BY SUPPLIER ....................................................................................... 22
10.2.1
Technical data sheet ............................................................................................................ 22
10.2.2
Certificates of type tests and routine tests ........................................................................... 22
10.2.3
Guidelines and manuals...................................................................................................... 22
10.2.4
Safety standards .................................................................................................................. 23
10.2.5
Related drawings ................................................................................................................ 23
WARRANTY ........................................................................................................................................ 23
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GES (Technical Specification of GECOL)
Ring Main Units with T-off CB
1
Scope and service conditions
1.1
Scope
(a) This specification covers the ground mounted three-phase ring main units with T-off
CB (hereinafter referred as RMUs) designed for indoor or outdoor installation and for
the rated voltage of 12kV. This specification does not cover RMUs with T-off fuse.
For the RMU with T-off fuse, refer the GES 34135 titled ‘Ring Main Units with T-off
Fuses’.
(b) This specification is also applicable to the operating devices of the RMUs and to their
auxiliary equipment.
1.2
Service conditions
1.2.1 Normal service conditions for indoor RMUs
(a) Ambient air temperature
- Maximum ambient air temperature: 50 ºC
- Maximum 24 hour average value of the ambient air temperature: 35 ºC
- Minimum ambient air temperature: -5 ºC
(b) The conditions of humidity
- Maximum 24 hour average value of the relative humidity: 95%
- Maximum one month average value of the relative humidity: 90%
- Maximum 24 hour average value of the water vapour pressure: 2.2 kPa
- Maximum one month average value of the water vapour pressure: 1.8 kPa
1.2.2 Normal service conditions for outdoor RMUs
(a) Ambient air temperature
- Maximum ambient air temperature: 50 ºC
- Maximum 24 hour average value of the ambient air temperature: 35 ºC
- Minimum ambient air temperature: -10 ºC
(b) Maximum solar radiation: 1,000 W/m2
(c) Maximum altitude: 1,000 m
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(d) Maximum pollution level: level II – medium, according to the Table 1 of IEC 60815
1.2.3 Unusual service conditions
(a) Pollution
For installation in a place of pollution level III or IV, IEC 60815 should be specified.
(b) Temperature
For installation in a place where the ambient temperature is higher than the normal
condition, IEC 60721-2-1 should be specified.
(c) Humidity
For installation in a place where the humidity is higher than the normal condition, IEC
60721-2-1 should be specified.
2
Normative references
The RMU shall conform to the latest edition of following international standards:
(a) IEC 60050(441): IEV – Part 441: Switchgear, controlgear, fuses
(b) IEC 60059: IEC standard current ratings
(c) IEC 60060: all parts, high-voltage test techniques
(d) IEC 60071-2: Insulation coordination – Part 2: Application guide
(e) IEC 60137: Bushing for alternating voltages above 1kV
(f) IEC 60282-1: High-voltage fuses - Part 1: Current-limiting fuses
(g) IEC 60376: Specification and acceptance of new sulphur hexafluoride
(h) IEC 60427: Synthetic testing of high-voltage alternating current circuit breakers
(i) IEC 60480: Guide to the checking of sulphur hexafluoride (SF6) taken from electrical
equipment
(j) IEC 60529: Degrees of protection provided by enclosures (IP code)
(k) IEC 60721-2-1: Classification of environmental conditions - Part 2: Environmental
conditions appearing in nature - Temperature and humidity
(l) IEC 61634: High-voltage switchgear and controlgear - Use and handling of sulphur
hexafluoride in high-voltage switchgear and controlgear
(m) IEC 61958: High-voltage prefabricated switchgear and controlgear assemblies –
Voltage presence indicating systems
(n) IEC 62271-1 (60694): Common specification for high-voltage switchgear and
controlgear standards
(o) IEC 62271-103 (60265-1): High voltage switches for rated voltage above 1kV and up
to 52kV
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(p) IEC 62271-105: High voltage alternating current switch fuse combination
3
Definitions
3.1
Non-extensible RMU
The RMU equipped with 2 ring switches and 1 CB
3.2
Extensible RMU
The RMU composed individually and connected to each other upon users’ requests
4
Kinds and ratings
4.1
Kinds
4.1.1 Kinds of RMU according to insulation material
Table 1 - Kinds of RMU according to insulation material
Rated voltage
Kinds of insulation
12kV
SF-6 gas insulated
O
Oil insulated
-
O : Applicable
- : Not applicable
Note: Manufacturer may propose and seek the approval of GECOL for any other higher technology
insulation materials for the RMU.
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4.1.2 Specification numbers
Table 2 - Specification numbers
Spec numbers
Rated
voltage
Description
Single line diagram*
Ring Main Unit with one 200A
CB for T-off, and two 630A loadbreak switches for feeders
3413022
Ring Main Unit with two 200A
CB for T-off, and two 630A loadbreak switches for feeders.
3413024
3413026
12 kV
Ring Main Unit with one 200A
CB for T-off, and three 630A
load-break switches for feeders.
3413028
Ring Main Unit with two 200A
CB for T-off, and three 630A
load-break switches for feeders.
3413030
Ring Main Unit with three 200A
CB for T-off, and two 630A loadbreak switches for feeders.
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*In the single line diagram two independent manual operating mechanisms for ring and earth switches are shown; but
ring switches consist of a moving contact assembled with three positions - close, open and earthed are also acceptable. In
all cases, the contacts of ring and earth switches shall be designed to prevent simultaneous closing.
4.2 Ratings
4.2.1 Rated voltage
The rated voltage shall be determined in accordance with the Table 3 of this
specification.
Table 3 - Rated voltages
Nominal voltage
11kV
Rated voltage
12kV
4.2.2 Rated insulation level
The rated withstand voltages shall be determined in accordance with the Table 4 of this
specification.
Table 4 - Rated insulation level
Rated voltage
12kV
Rated power-frequency withstand voltage (kVrms)*
28
Rated lightning impulse withstand voltage (kVpeak)**
75
* The test voltage shall be raised to the test value and maintained for 1 min.
** The test shall be performed with voltages of both polarities using the standard lightning impulse
1.2/50 μs according to IEC 60060-1.
4.2.3 Rated duration of short-circuit
The rated duration of short-circuit shall be 2 s.
4.2.4 Rated frequency
The rated frequency shall be 50 Hz.
4.2.5 Rated normal current and temperature rise
(a) The rated (normal) current is the r.m.s. value of the current which the switch of the
RMU shall be able to carry continuously under the rated voltage and the rated
frequency with a temperature rise not exceeding the values specified in the Table 3 of
IEC 60694.
(b) The rated current of the ring switch shall comply with GECOL’s request from the
values in the Table 5 of this specification.
4.2.6 Rated short-time withstand current
The rated short-time withstand current of the ring switch shall be selected from the
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Amended 31, Jan-2013
values preferred in the Table 5 of this specification upon GECOL’s request.
4.2.7 Rated peak withstand current
The rated peak withstand current of the ring switch shall be selected from the values
preferred in the Table 5 of this specification upon GECOL’s request.
Table 5 - Standard values of ratings related to the current
Rated
voltage
(kV)
12
Rated shorttime withstand
current (kA)
16
Rated peak
withstand
current (kApeak)
40
630
20
50
630
Rated normal current (A)
4.2.8 Rated line and cable-charging breaking currents
The rated line and cable-charging breaking currents of the ring switch shall not be less
than the value in the Table 6 of this specification.
Table 6 - Rated line and cable-charging breaking currents
Rated voltage
12kV
Rated line-charging breaking currents (A)
1
Rated cable-charging breaking currents (A)
10
4.2.9 Rated pressure of compressed gas supply for insulation
The rated pressure of compressed gas supply for insulation, if any, shall be stated by the
supplier.
5
Requirements
5.1
Required structure
5.1.1 General requirements
All accessories for installation, operation and maintenance, such as mounting frames,
operating rods, nuts & bolts, and so on, shall be provided with the RMU.
5.1.2 Enclosure
The enclosure of the RMU shall be made of equal to or better than the rolled steel with
antirust, and the thickness of the enclosure shall not be less than 3 mm.
5.1.3 Degree of protection (IP code) by enclosures
(a) The IP code of the RMU shall be equal to or better than the value in the Table 7 of this
specification.
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Amended 31, Jan-2013
Table 7 - IP code of RMU
Installation condition
Indoor installation
Outdoor installation
All-purpose
51
54
5.1.4 Operation device(s)
The operation device(s) to close, open and earth the main contact shall be provided with
the RMU and meet the followings.
(a) The operation shall be possible in the front of the RMU.
(b) The operation device(s) shall be three-position switch(es), and be arranged in order
close - opened - earthed.
5.1.5 Operation counter
(a) If requested by GECOL, at least a five-digit operation counter shall be provided
respectively to count the number of switching operation. The operation counter shall
be incremented by one for each operation.
(b) The size of the digit shall be at least 5 mm high. The color of the digit shall be black
and its background color shall be white.
5.1.6 Terminations and cable boxes
(a) The termination for the ring switch shall be inside the cable box and suitable for threecore XLPE insulated aluminum or copper cable with its size of up to 3c x 300 mm2.
(b) The termination for the T-off switch (or fused switch) shall be inside the cable box and
suitable for three-core XLPE insulated aluminum or copper cable with its size of up to
3c x 240 mm2.
(c) Each cable box shall be structured to be able to be equipped with a gland.
(d) All devices and equipment for cable terminations shall be provided by the supplier.
5.1.7 Glands, only for RMU with EFI
The glands shall be electrically separated from the enclosure of the RMU, and the
dielectric characteristics of the insulation between gland and enclosure shall meet the
requirements listed below.
(a) Power frequency withstand voltage: 2 kV at least
(b) Impulse withstand voltage: 6 kV at least
5.1.8 Bushings
(a) The current ratings of bushings shall not be less than those of the RMU.
(b) The nominal creepage distance of bushings shall not be less than the values in the
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Table 8 of this specification.
Table 8 - The minimum nominal creepage distance of bushings
Pollution level
Rated voltage
III - Heavy
12kV
345
Note 1: Application factor of 1.15 is already applied.
Note 2: The factor for average diameter of bushing (Dm) = 1.0 (less than 300 mm)
5.1.9 Bus-bars
The rated current of the bus-bar shall not be less than that of the RMU.
5.1.10 Flammability
(a) The materials shall be chosen and the parts shall be designed such that they retard the
propagation of any flame resulting from accidental overheating in the RMU.
(b) Insulating parts shall be of non-inflammable or self-extinguishing materials and shall
not emit noxious or explosive vapor.
5.1.11 Earthing of RMUs
(a) The frame of each device shall be provided with a reliable earthing terminal having a
clamping screw or bolt for connection to an earthing conductor suitable for fault
conditions.
(b) The diameter of the clamping screw or bolt shall be at least 12 mm.
(c) The connecting point shall be marked with the "protective earth" symbol as below, and
the size of the symbol shall be at least 10 mm.
5.1.12 Interlock
The interlock shall be provided to make sure of followings.
(a) The operation of the ring switch and/or the fuse-switch shall not be able to move
directly from the close position to the earthed position nor from the earthed position to
the close position.
(b) Operating of the cable test cover shall be blocked unless associated ring switch or
fuse-switch is at the ‘Earth’ position.
(c) Closing operation of the ring switch and/or fuse-switch with the test plug inserted
and/or cover open shall be blocked.
(d) Fuse changing from the fuse-switch in any position other than ‘Earth’ position shall
be blocked.
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(e) Closing fuse switch to ‘close’ shall be blocked where as;
- The fuse access cover not properly closed
- Fuse switch in ‘Earth’ position
- Fuse holder not correctly in position
- Any fuse blown
(f) Opening of cable boxes without the associated ring switch in the ‘Earth’ position shall
be blocked.
5.1.13 Additional requirement for extensible RMUs
(a) The extensible RMU shall be structured so that the RMU can be extended to both
sizes with proper means.
(b) The device for extension shall be properly protected not to damage to operators or
other electric devices electrically or mechanically.
5.1.14 Mimic diagram
The mimic diagram shall be provided on the front side of the RMU with the necessary
graphical symbols and indicators. The mimic diagram shall contain at least the following
devices.
(a) Bus-bar(s)
(b) Switch position indicators (including the earthed switch)
(c) Switch operating buttons (including the earthed switch)
(d) Transformer symbols (if any)
5.1.15 Dimensions
All dimensions of the RMU shall be stated by the supplier, and approved by GECOL.
5.2
Required performance
5.2.1 Ring switch
(a) The ring switch of the RMU shall be able to break and make the rated normal current
of the value in the Table 5 of this specification.
(b) The ring switch of the RMU shall be able to withstand the rated short-time withstand
current and peak withstand current specified in the Table 5 of this specification.
(c) The ring switch of the RMU shall be able to break and make the rated line and cable
charging breaking current specified in the Table 6 of this specification.
(d) The ring switch shall consist of a moving contact assembled with three positions close, open and earthed. Two independent manual operating mechanisms for ring and
earth switches are also acceptable. In this case, the contacts of ring and earth switches
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shall be designed to prevent simultaneous closing. The contact of the earth switch
shall be designed to have the same short circuit capacity as that of the ring switch.
5.2.2 Circuit breaker
(a) The rating of the CB shall be in compliance with the sub-clauses listed below.
- Rated voltage: 12 kV
- Rated current: not less than 200 A
- Rated short-circuit breaking current: not less than 16 kA
(b) The CB shall be equipped with a bushing CT per each phase for protection purpose,
and the accuracy class of the CT shall be equivalent to or better than 10P class. The
CT shall conform to the GES titled ‘Current Transformer’.
(c) The CB shall be equipped with the devices to release the signals for tripping the CB
when the current of each phase through the CB exceeds the value specified, and also
equipped with the device to release the signal for tripping the CB when the zero
sequence current through the CB exceeds the value specified.
- The relay(s) on the CB are acceptable.
- The tripping coils with fuses are acceptable. (Refer to the Appendix B of this
specification)
- Others equivalent to or better than the methods listed above are acceptable, if
approved by GECOL.
(d) Unless otherwise mentioned above, the GES titled ‘High Voltage Alternating-current
Circuit-breakers’ shall be taken into consideration.
(e) There shall be the possibility of tripping the CB by a normally open contact from the
thermometer for protecting the distribution transformer fed by the RMU. The
connecting points of the thermometer contact wires shall be well marked and made
accessible for connection on site.
5.2.3 Voltage presence indicating systems
(a) The voltage presence indicating systems to check the presence of voltage in the cables
shall be provided with the ring switch respectively, and in compliance with IEC 61958.
(b) The indicator shall be designed so that the lamp shall be turned off normally and can
be only turned on when required by operators.
5.2.4 Fault indicating device
The RMU shall be equipped with the fault indicating device including its instrument
transformer, such as CT or ZCT. The kind of fault indicating device shall be in compliance
with GECOL’s request. Unless otherwise mentioned by GECOL, FCI shall be provided.
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5.2.5 FCI (fault current indicator) combined with CT, if requested by GECOL
(a) The 3 CTs and fault current indicator shall be provided with the RMU.
(b) The inner diameter of the CT shall cover cable up to 300 mm2.
(c) The CT shall be so structured to be installed on the cable of each phase respectively.
(d) The rated primary current of the CT shall be in compliance with GECOL’s request.
Unless otherwise mentioned by GECOL, it shall comply with the rated current of the
ring switch.
(e) The rated secondary current of the CT shall be in compliance with the FCI.
(f) The target of the fault indicator shall be automatically reset under the normal condition.
(g) The operation current of the earth fault indicator shall be stated by the supplier, and
the operation current of the earth fault indicator shall be between 2 In ~ 3 In (where, In:
load current).
(h) The FCI shall be able to operate for 4 hours under the fault condition of the system.
(i) The FCI shall be so structured to be installed on the front side of the enclosure.
(j) Unless otherwise mentioned above, refer to the GES titled ‘Zero-phase-sequence
Current Transformers’.
5.2.6 EFI (earth fault indicator) combined with ZCT, if requested by GECOL
(a) The ZCT and earth fault indicator shall be provided with the RMU.
(b) The inner diameter of the ZCT shall cover armored cable up to 3c x 300 mm2.
(c) The rated primary zero-phase current of the ZCT shall be in compliance with
GECOL’s request. Unless otherwise mentioned by GECOL, it shall be specified by
the supplier.
(d) The rated secondary zero-phase current of the ZCT shall be in compliance with the
EFI.
(e) The target of the fault indicator shall be automatically reset under the normal
condition.
(f) The operation current of the earth fault indicator shall be stated by the supplier, and the
operation current of the earth fault indicator shall be between 2 In ~ 3 In (where, In:
load current).
(g) The earth fault indicator shall be able to operate for 4 hours under the fault condition
of the system.
(h) Unless otherwise mentioned above, refer to the GES titled ‘Zero-phase-sequence
Current Transformers’.
5.2.7 Cable testing facility
The RMU shall have test bushings or test probe insertion facility for high voltage and
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current injection tests for the cables terminated at the ring switches. Disconnection of
cables for testing purpose is not acceptable.
5.2.8 SF6 pressure gauge
If SF6-gas insulated RMU, the gas pressure gauge shall be equipped with the RMU, and
operational pressure range shall be indicated on the gas pressure gauge.
5.2.9 Manual operation device
The operating mechanisms shall be accessible by removing the front plate. The
operating handle shall have anti-reflex action and shall be stored at the front of the RMU.
The operating handle shall be used commonly for all operations of both ring and fuseswitches. Operating handle inserts shall have appropriate marking to avoid wrong insertion
of handle during switching operations. Physical force required for operating any
mechanism shall not exceed 400 N.
5.2.10 Requirements for gases in RMUs
(a) For RMUs with gas, the supplier shall specify the type and the required quantity,
quality and density of the gas to be used in RMUs and provide GECOL with
necessary instructions for renewing the gas and maintaining its required quantity and
quality.
(b) For SF6-filled RMUs, new sulphur hexafluoride shall comply with related provisions
of IEC 60376.
5.2.11 Electromagnetic compatibility (EMC)
The secondary system shall be able to withstand electromagnetic disturbances in
compliance with the clause 5.18 of IEC 60694.
5.2.12 Provision for motorizing the RMU for remote control
There shall be all provisions facilitating installing of motors, driven actuators, auxiliary
relays and all other accessories
for automatic remote operation and signaling for the
load break switches and the tee-off circuit breaker of the RMU. Manufacturer shall provide
all drawings for GECOL to enable future installing of remote control equipments. Also all
6
Tests
6.1
Type tests
The type tests shall be carried out in accordance with the clause 6 of IEC 62271-200 and
the clause 6 of IEC 62271-105, and the type tests for RMUs are listed in the Table 9 of this
specification.
Table 9 - Type test
Rating
Ring
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Related
Fuse-
Related
Amended 31, Jan-2013
switch
clauses
60265-1
switch
clauses
62271-105
Dielectric tests
O
6.2
O
6.2
Measurement of the resistance of the main circuit
O
6.4
O
6.4
Temperature-rise tests
O
6.5
O
6.5
Short-time withstand current and peak withstand current tests
O
6.6
-
-
Verification of protection
O
6.7
O
6.7
Tightness tests
O
6.8
O
6.8
EMC tests
O
6.9
O
6.9
Making & breaking test
O
6.101
O
6.101
Mechanical operation test
O
6.102
O
6.102
Mechanical shock tests on fuses
-
-
O
6.103
Thermal test with long pre-arcing time of fuse
-
-
O
6.104
Internal arcing test
O
6.106 of
O
6.106 of 62271-200
62271-200
O : Mandatory
Note: For type tests of T-off CB, the GES 34110 titled ‘High-voltage Alternating-current Circuit Breakers’
shall be referred.
6.2
Routine tests
The routine tests shall be performed in accordance with the clause 7 of IEC 62271-1 and
clause 7 of IEC 62271-105, and the routine tests for RMUs and the related clauses are
listed below;
(a) Dielectric test on the main circuit: 7.1 of IEC 62271-1
(b) Tests on auxiliary and control circuits: 7.2 of IEC 62271-1
(c) Measurement of the resistance of the main circuit: 7.3 of IEC 62271-1
(d) Tightness test: 7.4 of IEC 62271-1
(e) Design and visual checks: 7.5 of IEC 62271-1
(f) Mechanical operation tests: 7.102 of IEC 62271-200 / 7.101 of IEC 62271-105
(g) Tests after erection on site: 7.105 of IEC 62271-200
For routine tests of T-off CB, the GES 34110 titled ‘High-voltage Alternating-current
Circuit Breakers’ shall be referred.
The routine tests shall be repeated in the presence of GECOL’s representatives on 10%
of the quantity to be offered, chosen at random, subject to a minimum of 2 Nos. per each
type of the RMUs.
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7
Rating plate
7.1
Requirements for rating plate
(a) The rating plate shall be plainly visible in the position of normal service and
installation.
(b) For outdoor RMUs, the rating plates and their fixings shall be weatherproof and
corrosion-proof.
(c) If the RMUs consist of several parts, each part shall be equipped with a rating plate.
(d) The letters on the rating plate shall be marked by means of lasting visibility during the
life of the RMU.
(e) The font, size and colors of letters shall comply with the Table 10 of this specification.
Table 10 – Letter font, size and colors of the rating plate
Letter type
Font
Roman
Size
4 mm high at least
Black, dark gray,
depressed engraving
White, silver or light gray
Letters
Colors
Background
7.2
Information of rating plate
The information of rating plate shall be in accordance with Table 11 of this specification.
Table 11 - Rating plate information
Ring switch
Fuse-switch
Supplier and/or manufacturer
Rating
Unit
O
O
Type designation and serial number
O
O
Year and Month of manufacture
O
O
Rated voltage
kV
O
O
Rated lightning impulse withstand voltage
kV
O
O
Rated power frequency withstand voltage
kV
O
O
Rated frequency
Hz
O
O
Rated normal current
A
O
O
Rated duration of short circuit
s
O
O
Rated short-time withstand current (for main and
kA
O
O
kA
O
O
Maximum & Minimum pressure of insulation
MPa
O
O
Weight
kg
O
O
Dimensions
mm
O
O
O
O
earthing circuits)
Rated peak withstand current (for main and earthing
circuits)
Relevant standard with date of issue
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Amended 31, Jan-2013
O : The marking of these values is mandatory.
8
Marking
8.1
Position-indicating device
The position-indicating device for the contact position of the main circuit shall be
possible to easily check the state of the position-indicating device when operating locally.
8.1.1 Letter type and colors of the position-indicating device
(a) The colors of the position-indicating device shall comply with the Table 12 of this
specification.
Table 12 - Colors of the position-indicating device
Position
Color
Symbol or letter
Open
Closed
Background
Green
The color Contrasting
with the background *
Earthed
Red
Yellow
* The color of green, red and yellow shall be excluded.
(b) The letter font of the position-indicating device shall be ‘Roman font’, the size of the
position-indicating device shall be at least 30 mm high.
8.1.2 Symbols and letters of the position-indicating device
(a) The Symbols and letters of the position-indicating device shall comply with the Table
13 of this specification.
Table 13 - Symbols of the position-indicating device
Position
Symbol
Letter
Open
OFF* / OPEN
Closed
ON* / CLOSE
Earthed
EARTH*
* : The preferred means are marked ‘*’.
(b) Alternatively, in the case of a multi-function device, the positions may be marked with
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Amended 31, Jan-2013
graphical symbols for diagrams of IEC 60617.
8.2
Spring-charge indicator (only for spring operation type)
The spring-charge indicator shall be possible to easily check the state of the charging
device when operating locally.
8.2.1 Letter type and colors of the spring-charge indicator
(a) The colors of the spring charge indicator shall comply with the Table 12 of this
specification.
Table 14 - colors of the spring charge indicator
Position
Charged
Discharged
Color
Symbol or letter
The color Contrasting
with the background *
Background
Black
White
* The color of green, red and yellow shall be excluded.
(b) The letter font of the spring charge indicator shall be ‘Roman font’, the size of the
position-indicating device shall be at least 30 mm high.
8.2.2 Symbols and letters of the spring charge indicator
The symbols and letters of the spring charge indicator shall comply with the Table 13 of
this specification.
Table 15 - Symbols of the position-indicating device
Position
Symbol
Charged
Letter
CHARGE
Specified by supplier
Discharged
9
DISCHARGE
Packing and delivery
The supplier shall provide packing of the RMUs to prevent their damage or deterioration
during transit to their final destination and long period of storage. The packing shall be
sufficient to withstand, without limitation, rough handling during transit and exposure to
extreme temperatures, salt and precipitation during transit and open storage.
(a) All RMUs and their components shall be shipped from the factory to the specified site.
(b) The RMU shall be wrapped in vinyl sheets of proper thickness to prevent ingress of
humidity. The sufficient dehumidifying agent shall be inside the packing. The switch
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Amended 31, Jan-2013
shall be on a wooden pallet and the base of switch shall be tied to the pallet with
galvanized steel bolts and nuts. A wooden box shall cover the whole switch and shall
be connected to the pallet without any looseness or disconnection. The pallet and
packing case shall be suitable for handling by forklift truck and they shall have
enough strength and thickness for protection of the switch. The wood material should
be disinfected to avoid import of insects or virus.
(c) The size and weight of packing cases shall be taken into consideration, where
appropriate, the remoteness of the RMUs’ final destination and the absence of heavy
handling facilities at all points in transit.
(d) The RMUs shall be packed one by one even though the numbers of RMUs to be
supplied is plural.
(e) Each shipment shall include a detailed packing list identifying all items by part
number, including hardware.
(f) All material shall be carefully loaded for protection during shipment.
(g) Small parts and fasteners shall be carefully boxed, crated, bagged or otherwise
containerized and protected for shipment.
(h) All materials shall be arranged to allow safe unloading at the site.
(i) There shall be handling instruction to minimize damage.
The outer packing must be clearly marked on at least four (4) sides as follows;
(a) Name of the procuring department
(b) Name of the supplier
(c) Contract description and number
(d) Loading place
(e) Final destination
(f) Gross weight
(g) Net weight
(h) Special lifting instructions, if any
(i) Special handling instructions, if any
(j) Relevant pollution or environment classifications, if any
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10 Documents and certificates
10.1 Information to be given by GECOL
10.1.1 Service conditions
Excluding the normal conditions referred to the clause 1.2.1 and 1.2.2 of this
specification, service conditions at which the RMU will be located shall be stated by
GECOL.
10.1.2 Rated values and characteristics
The specific ratings shall be stated by GECOL.
(a) Kind of RMU (Non-extensible with CB / Extensible (ring switch) / Extensible (CB))
(b) Insulation material (SF-6 gas only):
(c) Rated voltage:
(d) Rated normal current of the ring switch:
(e) Rated short-time withstand current:
(f) Installation condition (Indoor / Outdoor):
(g) Pollution level (equal to below II / III / IV):
(h) Type of fault indicator (None / FCI (default) / EFI):
(i) Others
10.2 Information to be given by supplier
10.2.1 Technical data sheet
The technical data sheet shall be filled and provided by supplier according to the annex
A of this specification.
10.2.2 Certificates of type tests and routine tests
(a) The certificates of type tests according to clause 6.1 of this specification shall be
provided by supplier.
(b) The certificates of routine tests according to clause 6.2 of this specification shall be
provided by supplier if required by GECOL.
10.2.3 Guidelines and manuals
The supplier should provide instructions for the transport, storage, installation, operation
and maintenance of a RMU. The instructions for the transport and storage should be given
before delivery, and the instructions for the installation, operation and maintenance should
be given by the time of delivery at the latest.
The guidelines and manual shall be provided by means of softcopy as well as hardcopy.
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(a) The instructions for installation shall be provided by the supplier according to the
clause 10.2 of IEC 60694.
(b) The instructions for operation shall be provided by the supplier according to the clause
10.3 of IEC 60694.
(c) The instructions for maintenance shall be provided by the supplier according to the
clause 10.4 of IEC 60694.
(d) The schedule for maintenance shall be specified by supplier.
10.2.4 Safety standards
The safety standards for installation, operation and maintenance shall be provided by
supplier according to the clause 11 of IEC 60694.
10.2.5 Related drawings
The related drawings including the shape and dimensions of the RMUs shall be provided
by supplier.
11 Warranty
The supplier shall provide the full warranty on all equipment supplied during the period
specified below. The warranty shall cover all parts and all costs, which are directly
attributable to the supplier. Warranty coverage shall begin on the date that the equipment is
received.
The warranty period shall be 3 years.
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Annex A
Technical Data Sheet
No.
Description
Particulars
General
1
Manufacturer
2
Indoor or outdoor
3
Temperature class
Ratings and characteristics
4
Rated voltage
5
Rated insulation level
6
Rated frequency
7
Rated normal current
Rated breaking current
8
- Active load current
9
- Closed loop current
10
- Transformer off-load current
11
- Cable charging current
12
Rated short-circuit making current
13
Rated duration of short-circuit
Constructional features
14
Mass of complete switch
15
Gas pressure and limits of gas pressure
Minimum clearances in air
16
Between poles
17
To earth
18 Type of fault indicator, if any
19 Overall dimensions
Signature
:
Designation
:
Name of Tenderer
:
Date
:
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Amended 31, Jan-2013
Annex B
Simple concept of the CB tripped by tripping coil with LV fuse
1. Linked with ZCT
CB
ZCT
Trip coil
Fuse
Note 1: The rated current of the fuse shall depend on the rated secondary current of the ZCT and the rated
current of the fuse shall be stated by the supplier.
Note 2: The ZCT shall be in compliance with the GES titled ‘Zero-phase-sequence Current Transformers’.
2. Linked with 3 CTs
CTs
CB
Trip coil
Fuse
Trip coil
Fuse
Trip coil
Fuse
Note 3: The rated current of the fuse shall depend on the rated secondary current of the CTs and the rated
current of the fuse shall be stated by the supplier.
Note 4: The CTs shall be in compliance with the GES titled ‘Current Transformers’.
Note 5: The fuse and the trip coil for neutral line of CTs can also apply.
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Amended 31, Jan-2013
Annex C
Interfaces for connection between RMU and cable
For 630 A
For 400 A
Dia 56±0.2
Dia 56±0.2
Dia 46±0.2
Dia 46±0.2
Dia 25
For 200 A
Dia 44.5±0.2
Dia 32.5±0.2
0
Dia 14 -0.04
min
M16x2-6H
Dia 30.9±0.2
0
Dia 7.9 -0.05
30
min
40
35
90±0.2
90±0.2
0
48-0.2
10± 1
12± 0.2
12± 0.2
Dia 48.5±0.2
Dia 70±0.2
Dia 70±0.2