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GE EnergyIndustrial Solutions
New Compact Gas Insulated Ring Main Unit
GE
Industrial Solutions
2010
2010 America’s and World’s Most Admired Companies
2009 Best Global Brand
2010 World's most innovative companies
2008 World’s Most Respected Companies 2007 World’s Best R&D Companies
2008 Most Respected Global Company
GE is a diversified organization covering a myriad of market segments, including infrastructure, finance and media.
From energy, water, transportation and health to access to money and information, GE serves customers in more than
100 countries and employs more than 300,000 people worldwide.
The company traces its beginnings from Thomas A. Edison, who established the Edison Electric Light Company in 1878.
In 1892, a merger of Edison General Electric Company and Thomson-Houston Electric Company created the General
Electric Company. GE is the only company listed in the Dow Jones Industrial Index today that was also included in the
original index in 1896.
GE Industrial Solutions – a division of GE Energy Group, is a global leading provider in power distribution, offering a wide
range of products which include medium and low voltage power distribution equipments and components, and motor &
control systems that are safe, reliable and offer high performance. Its innovative solutions can improve energy
efficiency and environmental impact in power plants, power grids, oil & gas, mining, industrial manufacturing, rail
transportation, commercial buildings, residential houses, alternative energy and many other industries.
GE is one of the worldwide partners of the Olympic Games. In 2008, GE assisted Beijing with this tremendous event, which was unprecedented in scale and first-class in its use of science and technology, offering a series of innovative solutions and products for around 400 Olympic infrastructure projects, covering fields in electricity distribution, lighting, security, water processing, benefiting some 37 Olympic venues and 168 commercial buildings. GE also brought its experiences to the 2010 Expo in Shanghai, Asia Games in Guangzhou, Vancouver Olympic Games and will continue through to the London 2012 Olympic Games.
GE
Industrial Solutions
2010
2010 America’s and World’s Most Admired Companies
2009 Best Global Brand
2010 World's most innovative companies
2008 World’s Most Respected Companies 2007 World’s Best R&D Companies
2008 Most Respected Global Company
GE is a diversified organization covering a myriad of market segments, including infrastructure, finance and media.
From energy, water, transportation and health to access to money and information, GE serves customers in more than
100 countries and employs more than 300,000 people worldwide.
The company traces its beginnings from Thomas A. Edison, who established the Edison Electric Light Company in 1878.
In 1892, a merger of Edison General Electric Company and Thomson-Houston Electric Company created the General
Electric Company. GE is the only company listed in the Dow Jones Industrial Index today that was also included in the
original index in 1896.
GE Industrial Solutions – a division of GE Energy Group, is a global leading provider in power distribution, offering a wide
range of products which include medium and low voltage power distribution equipments and components, and motor &
control systems that are safe, reliable and offer high performance. Its innovative solutions can improve energy
efficiency and environmental impact in power plants, power grids, oil & gas, mining, industrial manufacturing, rail
transportation, commercial buildings, residential houses, alternative energy and many other industries.
GE is one of the worldwide partners of the Olympic Games. In 2008, GE assisted Beijing with this tremendous event, which was unprecedented in scale and first-class in its use of science and technology, offering a series of innovative solutions and products for around 400 Olympic infrastructure projects, covering fields in electricity distribution, lighting, security, water processing, benefiting some 37 Olympic venues and 168 commercial buildings. GE also brought its experiences to the 2010 Expo in Shanghai, Asia Games in Guangzhou, Vancouver Olympic Games and will continue through to the London 2012 Olympic Games.
1
Applications
SecoRMU is a compact, modularized, extendable gas insulated ring main unit with all the primary conductive system sealed in a stainless SF6 gas tank, providing customers a reliable, high-performance and cost efficient product, helping customers to reduce the operating and maintenance cost.SecoRMU series ring main units provide integrated solutions for most switching applications in 12kV/17.5kV/24kV distribution networks.
2
General
The traditional 12kV/17.5kV/24kV power distribution system is arranged mainly as a radial network, secondarily as a combination of radial and tree network. Since many users are connected in "T" form to a power line, any maintenance or fault on the power line will make all the users connected suffering power off. The power supply is not reliable enough.Therefore, nowadays, ring power supply system and multi-loop power distribution are widely used in regional secondary distribution network. The 12kV/17.5kV/24kV gas insulated metal-enclosed ring main unit which acts as the branch, sub-section and sub-connection in distribution network is extensively used.
SecoRMU is a kind of SF6 gas-insulated metal-enclosed switchgear, which use load break switch, load break switch combined with fuse, three position disconnector and earthing switch combined with vacuum circuit breaker etc. to form various functional module units. With the features of completely sealed, modular design, flexible combination and extension, SecoRMU provides customers a compact, reliable, excellent performance and free maintenance product. It is widely used in compact power distribution substations, wind power plants, metal & petrochemical industry, metro, commercial buildings, residential houses etc.
Safe and ReliableSecoRMU adopts SF6 gas, which has strong electronegativity and excellent dielectric insulating performance, as the insulating medium. The insulating strength of SF6 gas is about 2-3 times of air in uniform electric field. Furthermore, SF6 gas is nonpoisonous, odor free and nonflammable, with excellent arc-extinguishing and cooling performances, so that it can extinguish the arc quickly and reliably after the switch breaking.
Small and CompactDue to the excellent insulating performance of SF6 gas, SecoRMU becomes smaller and lighter with a more compact structure. Under the premise of ensuring its excellent performance, safety and reliability, SecoRMU could save space for the users greatly.
Advanced and FlexibleUnder the international advanced design, manufacturing process and testing methods, SecoRMU series ring main units have simple structures, flexible operations and reliable interlocks. In addition, with the advanced sensor technology and the up-to-date microcomputer protective relay, GE can provide complete solutions to meet different requirements of the users.
Applications
SecoRMU is a compact, modularized, extendable gas insulated ring main unit with all the primary conductive system sealed in a stainless SF6 gas tank, providing customers a reliable, high-performance and cost efficient product, helping customers to reduce the operating and maintenance cost.SecoRMU series ring main units provide integrated solutions for most switching applications in 12kV/17.5kV/24kV distribution networks.
3
Modular Design/Completely Sealed/Free ExtendableSecoRMU is a new generation of compact modular switchgear, with a 3mm high-quality stainless steel tank containing all live parts and switching functions. The gas tank is filled with SF6 gas, and is manufactured by laser welding process. The structures of the entire series include individual-gas tank and common-gas tank type. Each unit has its independent function and metal enclosure, and is extendable to the left or right freely.
The combination and extension of SecoRMU series ring main units are simple and reliable, while the cable connection is also safe and convenient.
Enviroment independentSecoRMU is a pressure-sealed system that all the primary conductive system is sealed in SF6 gas tank and independent of environmental influence, such as dew, dust, salt fog, small animals, chemical substances, etc. Therefore, it reaches the real maintenance free and can be used in various severe conditions. SecoRMU has strong ability to prevent flooding. Both the gas tank and fuse compartment reach IP67 protection grade. SecoRMU not only makes the power distribution system more reliable, but also helps to reduce the operation and maintenance cost.
Environmental Conditions
Ambient temperature -25°C~+40°C
HumidityMax daily average relative humidity ≤95%
Max monthly average relative humidity ≤90%
Altitude above sea level ≤1000m (When equipment is to be installed at more than 1000m above sea level, please contact GE.)
Special conditions:
In accrodance with IEC60694, the manufacturer and end-user must agree about special operating conditions which deviate from operation under normal conditions.
The manufacturer/supplier must be consulted in advance if especially severe operating conditions are involved.
IEC62271-200High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to
and including 52 kV
IEC60265-1 High-voltage switches – Part1: Switches for rated voltages above 1 kV and less than 52 kV
IEC62271-100 High-voltage switchgear and controlgear – Part 100: High-voltage alternating-current circuit-breakers
IEC62271-105 High-voltage switchgear and controlgear – Part 105: Alternating current switch-fuse combinations
IEC60282-1 High Voltage Fuses –Part 1 Current limiting fuses.
IEC62271-102 High-voltage switchgear and controlgear – Part 102: Alternating-current disconnectors and earthing switches
IEC62271-1 The Common specifications for high-voltage switchgear and control gear standards
IEC376-1971 Specification and acceptance of new Sulphar Hexafluoride
IEC 60529 Degrees of protection provided by enclosures (IP code)
IEC 60694 Common specifications for high voltage switchgear and controlgear standards
StandardsSecoRMU is manufactured and tested in accordance with the latest version of:
4
Product type
SER - □ - □ / □ □ □ Cable's entrance or exit modeL: left entrance-exit R: right entrance-exitLR: both sides entrance-exit NA: non entrance-exit
Extension modeI: left extendible D: right extendibleID: both sides extendible NA: not extendible
Rated current630: 630A rated current
Rated voltage12: 12kV rated voltage 17: 17.5kV rated voltage 24: 24kV rated voltage
Type of ring main unitK: load switch unit T: load switch-fuse combined unit V: vacuum circuit breaker unit B: bus tie unit C1/C2: bus bar lift unit*M1/M2: measurement unit* PT1/PT2: PT unit* P: Power supply unit(Common-tank ring main unit is combined freely by individual module units. For example, KT denotes a two-unit common-tank ring main unit made of one load switch unit and one load switch-fuse combined unit.)
Product type
For example:SER-V-12/630ID is a vacuum circuit breaker unit with 12kV rated voltage and 630A rated current, both sides extendible.SecoRMU-KKT-12/630 is a three-unit common-tank ring main unit, made of two load switch units and one load switch-fuse combined unit, with 12kV rated voltage and 630A rated current, not extendible.
*Note: C1/M1/PT1 Air insulated adopted
C2/M2/PT2 SF6 gas insulated adopted
5
SecoRMU Configurations
Advanced Design
Pressure Gauge
MeteringCompartment
Operating Mechanism
Enclosure Cable Bushing
Fuse Compartment
Pressure Relief Device
Busbar Extension
Gas TankOperating Mechanism
Bus Extension
Gas Tank
Fuse Compartment
Integrated Fuse Compartment:Cast three-phase entrance/exit terminals and fuse compartment together, arranged in the form of △, not only compact in structure, but also easy for assembly.
Embedded SecoVac-R Vacuum Circuit Breaker:Three-phase in one module. Horizontal arrangement. Compact structure and convenient installation. Vacuum circuit breaker unit is perfectly the same wide as other functional modules. High-voltage live part is completely isolated from outside environment to avoid any severe environmental impacts.
Modular Design:The basic functional module units include load break switch unit, switch fuse unit, vacuum circuit breaker unit, bus tie unit, etc. Each unit is extendible, and uses bus connector for expansion. Dimensions of all load break switch units, switch fuse units, vacuum circuit breaker units, bus tie units are 350×800×1380mm (width×depth×height).The load break switch unit and the switch fuse unit can combine together freely to form a common-tank unit. One common gas tank can accommodate 5 modules at most, while any of which is the same with the basic individual functional unit in the internal structure and performance.
Pressure Relief Channel:Each gas tank of SecoRMU has a pressure relief device. When internal arc fault occurs, the pressure relief device will open, allowing the pressurized gas flows to the pressure relief channel at the back or the bottom (according to the customer's requirement) of the gas tank, to release the pressure. The rated bursting point is 2 standard atmospheric pressure.
Baseplate of the gas tank
Sealing FlangePressure Relief device
Bottom of the gas tank
6
Advanced Manufacturing Equipment and Process
CNC Laser CuttingWith Germany TRUMPF CNC laser cutting / punching center, the machining precision of sheet metal can reach 0.05mm, ensuring the splicing clearance between gas compartments less than 0.1mm.
CNC Epoxy Resin Pressure MoldingThe epoxy resin insulation components, such as SecoVac-R vacuum circuit breaker, fuse compartment, cable bushing, busbar connector pedestal, insulator, etc., are produced by Germany NC HEDRICH vacuum resin mixture / pressure molding system, ensuring perfect insulation performance.
Automatic Helium Leakage DetectionWith Germany SEILER automatic Helium leakage detection equipment, the leakage of the gas chambers can be detected precisely, which ensures the leakage rate less than 0.02% per year and the service life more than 30 years.
Partial Discharge Testing LaboratoryGE has a top-class fully shielding partial discharge testing laboratory, with advanced German Powev Diagnosix partial discharge detector in it . Partial discharge test is performed to ensure the products' high quality.
CNC Silicon Rubber Pressure MoldingThe silicon rubber insulation components, such as busbar connector, cable bushing, terminal plug cover, etc., are produced by the Switzerland NC VOGEL mixture of silicone rubber / pressure molding system.
CNC Laser WeldingWith Germany TRUMPF three-dimensional five-axis CNC laser welding system automatically helium protection, the welding quality of the gas tank reaches the highest standard, which ensures the sealing reliability and product identity. The annual leakage rate is less than 0.02%.
7
Technical Data
ITEM UnitLoad Break Switch Unit
Switch Fuse UnitVacuum Circuit
Breaker UnitBus Tie Unit
Rated Voltage kV 12/17.5/24 12/17.5/24 12/17.5/24 12/17.5/24
Rated Current A 630 (1)* 630 630
Rated Frequency Hz 50 /60 50/60 50/60 50 /60
Rated power Freq withstand voltage (1 min) kV 50 50 50 50
Rated lightening impulse withstand voltage (peak) kV 125 125 125 125
Rated short-circuit making current kA (peak) 52 82 52 52
Rated short time withstand current (main circuit) kA 20 – 3s - 20 - 3s 20 – 3s
Rated short-circuit breaking current kA - 31.5 20 -
Rated peak value withstand current kA (peak) 52 - 52 52
Operating Sequence - - - O-0.3s-CO-180s-CO -
Electrical Endurance Capability class - E2 for load switch E2 for load switch E2 for breaker E2 for load switch
Transfer Current A - 1400 - -
Rated mainly active load-breaking current A 630 (1)* - 630
Rated closed-loop breaking current A 630 - - 630
Rated cable-charging breaking current A 16 - 31.5 16
Rated earth fault breaking current A 10 - - -
Rated cable- and line-charging breaking current under
earth fault conditions A 45 - - 45
Mechanical Endurance times 5000 5000 10000 5000
Dimension (W×D×H) mm 350×800×1380 350×800×1380 350×800×1380 350×800×1380
Weight kg 160 180 200 160
Internal arc degreeCable compartment 20kA 1s
Gas tank 20kA 1s
IP DegreeEnclosure IP3X
Gas tank IP67
SF6 Gas pressure at 20℃ 0. 03Mpa-relative
SF6 Gas Annual Leakage Rate < 0.02%
Thickness of stainless steel gas tank 3.0mm
Electric operation control voltage 24/48/110/220V DC 110/220V AC
(1)* Depending on the current rating of the fuse-link. Please refer to transformer-fuse selection table in page 14.
12/17.5/24kV SecoRMU Rating and electrical performance
8
SecoRMU Standard Modules
SER-K Load Switch Unit
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-K
Load switch unit
- Three position load break and
earthing switch
- Spring operating mechanism
- Switch position indication for
load break switch and earthing
switch
- Potential indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Earthing bar
- Interlock between the earthing
switch and the door/operation
shaft
- Cable bushings with integrated
sensors
- Panel padlock device
- Left/right entrance or exit cable
- Left/right extendible
- Electrical operating mechanism
DC24/48/110/220V,
AC110/220V
- Short circuit and earth fault
indicator
- Ring CT and ampere meter
- Arrester
- Cable terminals
- Auxiliary switch for load break
switch position
3NO+3NC
- Auxiliary switch for earthing
switch position
2NO+2NC
Used for connecting
or disconnecting the
incoming/outgoing
cable to the busbar,
grounding the three-
phase cable, as well as
having the capacity of
making the short circuit
current.
350×800×1380
(width×depth×height)
/160kg
9
SER-T Load switch-fuse combined unit
SER-V Vacuum circuit breaker unit
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-V
Vacuum circuit breaker
unit
- Three position disconnector and
earthing switch
- 630A vacuum circuit breaker
- Operating mechanism of the
vacuum circuit breaker
- Mechanical interlock and position
indicator for vacuum circuit
breaker and three position
disconnector and earthing switch
- Potential indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Earthing bar
- Interlock between the earthing
switch and the door/operation
shaft
- Operating mechanism interlock
between vacuum circuit breaker
and disconnector
- Cable bushings with integrated
sensors
- Panel padlock device
- Protection relay and protection CT
- Left/right entrance or exit cable
- Left/right extendible
- Electrical operating mechanism of
vacuum circuit breaker
DC24/48/110/220V,
AC110/220V
- Closing coil
DC24/48/110/220V,
AC110/220V
- Opening coil
DC24/48/110/220V,
AC110/220V
- Ring CT and ampere meter
- Arrester
- Cable terminals
- Auxiliary switch for vacuum circuit
breaker position
4NO+4NC
- Auxiliary switch for disconnector
position
2NO+2NC
- Auxiliary switch for earthing
switch position
1NO+1NC
Used in circuit
protection, motor
protection and
transformer protection.
350×800×1380
(width×depth×height)
/200kg
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-T
Load switch-fuse
combined unit
- Three position switch-fuse-
disconnector with upstream
earthing switch mechanically
linked with downstream earthing
switch
- Spring operating mechanism
- Switch position indication for
switch-fuse-disconnector and
earthing switch
- Fuse compartment
- Potential indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Earthing bar
- Interlock between the earthing
switch and the door/operation
shaft
- Cable bushings with integrated
sensors
- Panel padlock device
- Left/right entrance or exit cable
- Left/right extendible
- Electrical operating mechanism
DC24/48/110/220V,
AC110/220V
- Opening coil
DC24/48/110/220V,
AC110/220V
- Short circuit and earth fault
indicator
- Ring CT and ampere meter
- Arrester
- Cable terminals
- Load break switch position
auxiliary contacts
3NO+3NC
- Auxiliary switch for earthing
switch position
2NO+2NC
- Auxiliary switch for fuse blown
1NO
- Fuse (Please refer to transformer-
fuse selection table in page 14)
Used for controlling
and protecting
1250KVA and below
transformers.
(For 1600 kVA and
above transformers,
please contact GE).
350×800×1380
(width×depth×height)
/180kg
10
SER-B Bus Tie Unit
SER-V+SER-C1 Vacuum circuit breaker & Bus tie unit
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-B
Bus tie unit
- Two position load break switch
- Operating mechanism
- Switch position indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Panel padlock device
- Left/right entrance or exit
cable
- Left/right extendible
- Electrical operating
mechanism of load break
switch
DC24/48/110/220V,
AC110/220V
- Auxiliary switch for load break
switch position
3NO+3NC
Used for busbar
coupling.
350×800×1380
(width×depth×height)
/160kg
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-V+SER-C1
Vacuum circuit breaker
& Bus tie unit
- Three position disconnector and
earthing switch
- 630A vacuum circuit breaker
- Operating mechanism of the
vacuum circuit breaker
- Mechanical interlock and position
indicator for vacuum circuit breaker
and three position disconnector and
earthing switch
- Potential indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Earthing bar
- Interlock between the earthing
switch and the door/operation shaft
- Operating mechanism interlock
between vacuum circuit breaker
and disconnector
- Cable bushings with integrated
sensors
- Panel padlock device
- Relay and protection CT
- Electrical operating mechanism of
vacuum circuit breaker
DC24/48/110/220V,
AC110/220V
- Closing coil
DC24/48/110/220V,
AC110/220V
- Opening coil
DC24/48/110/220V,
AC110/220V
- Ring CT and ampere meter
- Auxiliary switch for disconnector
position
2NO+2NC
- Auxiliary switch for earthing switch
position
1NO+1NC
- Cable terminal used for busbar
coupling
Used as a tie breaker.
700×800×1380
(width×depth×height)
/300kg
11
SER-C Bus bar lift unit
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-C
Bus bar lift unit
- 630A bus bar
- Potential indicator
- Earthing bar
- C1 Air insulated adopted
- C2 SF6 gas insulated adopted
Used for incoming
or outgoing cable
connection.
350×800×1380
(width×depth×height)
/100kg
SER-M Metering unit
SchemeType
Dimension/WeightStandard Features Optional Features Remark
SER-M
Metering unit
- 630A bus bar
- Two current
transformers
- Two potential
transformers
- Fuse for protecting PT
- Potential indicator
- Three current
transformers
- Three potential
transformers
- Arrester
- A watt-hour meter
- A var-hour meter
Used for electric power
measurement.
600×800×1380
(width×depth×height)
/180kg
VV
12
SER-PT PT unit
SER-KPT Disconnector & PT Unit
SchemeType
Dimension/Weight
Standard
ConfigurationOptional Features Remark
SER-PT
PT unit
- 630A bus bar
- Two potential
transformers
- Fuse for protecting
PT
- A voltmeter
- Potential indicator
- Three potential
transformers
- Disconnector
- Arrester
Used for monitoring
the bus bar voltage,
providing voltage-lost
signal.
600×800×1380
(width×depth×height)
/180kg
SchemeType
Dimension/WeightStandard Configuration Optional Features Remark
SER-KPT
Disconnector & PT unit
- Three position
disconnector and
earthing switch
- Spring operating
mechanism
- Position indicator of
disconnector and
earthing switch
- Potential indicator
- SF6 gas pressure Gauge
- 630A bus bar
- Earthing bar
- Interlock between the
earthing switch and the
door/operation shaft
- Cable bushings with
integrated sensors
- Panel padlock device
- 1 set of three-phase PT
- Fuse for protecting PT
- A voltmeter
- Left/right entrance or exit
cable
- Electrical operating
mechanism
DC24/48/110/220V,
AC110/220V
- Short circuit and earth
fault indicator
- Arrester
- PT cable connector
- Auxiliary switch for
disconnector position
3NO+3NC
- Three potential
transformers
- Auxiliary switch for
earthing switch position
2NO+2NC
Used for monitoring
the bus bar voltage,
providing voltage
signal.
480/600×800×1380
(width×depth×height)
/300kg
13
Common-tank Ring Main UnitsSecoRMU provides economic schemes of putting multi units into a common tank. One common SF6-tank can accomodate maximum 5 modules combined freely. Each ring main unit is extendible, as well as capable of splicing with other individual-gas tank or common-tank ring main units.
14
SecoRMU Common-tank Ring Main Units Schemes
No. Type Primary Schematic Diagram Dimensions (mm)
1 SER-KK 700×800×1380
2 SER-KT 700×800×1380
3 SER-CK 700×800×1380
4 SER-CT 700×800×1380
5 SER-CV 700×800×1380
6 SER-VV 700×800×1380
7 SER-KKK 1050×800×1380
8 SER-KKT 1050×800×1380
9 SER-KTK 1050×800×1380
10 SER-KTT 1050×800×1380
11 SER-KKKK 1400×800×1380
12 SER-KTTT 1400×800×1380
15
No. Type Primary Schematic Diagram Dimensions (mm)
13 SER-KKTT 1400×800×1380
14 SER-KTKT 1400×800×1380
15 SER-KKKKK 1750×800×1380
16 SER- KTTTK 1750×800×1380
17 SER-KTTTT 1750×800×1380
18 SER-KKKKT 1750×800×1380
19 SER-KKKTT 1750×800×1380
20 SER-KKTTT 1750×800×1380
16
ProtectionTransformer/Line Protection
Protected by fuses combined with a LBS
SecoRMU offers two methods for transformer protection:
The striker pin of the fused holder can activate the spring charging mechanism of the load break switch while fault occurs. The load switch will trip immediately and break the current in the circuit.The selection of transformers and fuses is shown in the table below.
The dimension of the fuse-link:
Transformer – fuse Selection Table:
Rate Voltage (kV)Rated Capability of Transformer (kVA)
50 100 160 200 250 315 400 500 630 800 1000 1250 1600
6 ~ 7.2 16 25 32 40 50 63 100 100 100 / / / /
10~12 10 16 20 25 32 40 50 63 80 80 100 100 /
13.8 6 10 16 20 25 32 32 50 50 50 63 80 /
15~17.5 6 10 16 20 25 25 32 40 50 50 63 80 /
20~24 6 10 10 16 16 20 25 32 40 40 40 50 80
* Please contact GE for more details.
Length after triggering 26
442
Φ76
17
Protected by a VCB combined with relays
When using vacuum circuit breaker for transformer and line protection, WIC1 CT-powered protection relay of SEG company can be used to provide protection against short circuit, over-current and grounding fault.
In the WIC1 the following protection functions are realized:• 3 phase definite time over current and short-circuit protection with variable tripping times (ANSI 50/51)• 3 phase over current protection with selectable inverse time characteristics and definite time short-circuit current element (ANSI
50/51)• Definite time earth over current protection by internal calculation (ANSI 50N/51N)
The WIC1 is a CT-powered protection relay with minimal space requirement which complies with the highest demands on a digital protection device. It also has simple but safe wiring, and high electromagnetic interference immunity.
SecoRMU can be delivered with other protection relays according to customers' requirements. As an option, GE MIFII can be fitted in the low voltage compartment on top of the switchgear, and powered by external power supply.
Protection and Control – Phase and ground instantaneous overcurrent components – Thermal image protection – "N" option applicable for single phase or grounding – Inverse time characteristics curve of ANSI, IEC, IAC and EPTAR-C standards – Circuit breaker control (Opening and Closing) – Four times automatic reclosing – Cold load pickup functions – Configurable circuit breaker failure functions – Configurable I/O – 6 outputs include tripping, self- test alarm and 4 auxiliary outputs
Monitoring – 32 Event recorder – Faults recorder, including analog and digital values – KI2 counter for circuit breaker maintenance – Phase current measurement – The relay main screen shows the last 5 tripping data
User Interface – EnerVista for setting and monitoring – 2×16 LCD display – 6 LEDs, 4 of which are rogrammable in functions and colors – Front RS232 port, rear RS485 port, supporting Modbus® RTU and IEC60870-5-103 protocol
18
SecoRMU Accessories
Electric Operating MechanismSecoLBS load break switch and SecoVac-R vacuum circuit breaker can be equipped with electric operating mechanism with remote control functions, without influencing the structure and dimension of the module.
End PlugTerminal plugs are used for sealing the end terminal of the ring main units on both sides.
Fault IndicatorThe capacitive voltage indicator can display whether the bus or cable is live. The port on the bottom of the indicator is used for checking different phase. Short-circuit and grounding fault indicator can also be installed to locate the faults.
Pressure GaugeEach gas tank is equipped with a pressure gauge in the front panel, observing SF6 gas pressure, in order to ensure the safety and reliability of the operations.
Operating HandleUsed for operating the mechanism manually.
Busbar ConnectorSpecial designed for ring main unit's expansion and connection, the busbar connectors have compact structures and small connecting resistances. With them, the connection between ring main units is realiable and convenient. The busbar connector, with the shape of inner cone, adopts shielded silicon rubber to fully seal and insulate the interconnecting busbar and terminal busbar bushing.It also can be reserved for future expansion.
Cable ConnectorApplicable standards: EN50181 DIN47636- Shielded type (touchable), non-shielded type (untouchable)- Front-plug cable connector, rear-plug cable connector, rear-
plug lightning conductor- Cross section of cable: 35mm2×400mm2
- A standard unit can be connected to at most 2 cables (Front-plug cable connector + rear-plug cable connector, or front-plug cable connector + rear-plug arrester). If 3 cables or more is required (non-standard panel), please contact GE.
268100
19
Outdoor Switching Substation
The outdoor ring main unit substation adopts metal-enclosed prefabricated structure, with excellent mechanical strength. Its protection degree can reach IP33, which protect the machine against the harmful effects due to the ingress of water and solid foreign objects (like small animals).
Ventilation:The shutters can be opened symmetrically on the left and right, up and down. The panes are lined with removable good-quality thin net plates.
Thermal Insulation:The roof is lined with double-layer high-quality heat insulation foam.
Anti-condensation:The slope of the roof is designed more than 3°. The big roof cover, as well as good ventilation, prevent the switching substation from condensation.
Typical combination Dimension (Width × Depth × Height mm)
3-way unit 1350× 1200× 1750
4-way unit 1700× 1200× 1750
5-way unit 2050× 1200× 1750
6-way unit 2400× 1200× 1750
Metering unit + 4-way unit 2300× 1200× 1750
Metering unit + 5-way unit 2650× 1200× 1750
4-way unit + metering unit + 2-way unit 3000× 1200× 1750
Note: If special dimension is required, please contact GE.
20
SecoRMU Typical Solutions
Typical ring power supply system
Two incoming feeders alternate each other
General switching substation
HV/MV Primary distribution Secondary distribution
Terminal user
21
Back to wall 500mm suggested
Gas tank
Pressure relief device
80072025
110
800770
480
868
1380
545
Channel steel top view
50.5 50.5
100
720
Pressure release channel
≥800
mm
sug
gest
ed
Primary and secondary cable installation hole
10# channel steel M16 mounting hole
SecoRMU Dimension and Installation Foundation
Dimension and installation foundation of individual ring main unit
1)Foundation is made up of two pieces of 10# channel steel (as shown below).
2)The depth of cable trench is determined by actual cable types, as well as meeting the requirements of the technical specifications.
3)Each ring main unit has the same depth, while the distance between the hole's center of two different channel steels is 720mm. The panel can be fixed on channel steel by spot welding process.
Unit K T V B C M PT PA 350 600D 300 550
22
Installation foundation of outdoor switching substation
PTTKTK
Front side
Back sideBottom view
Front view Side view
1200 77
0
24002300
350 350
1750
1675
148.5
350 350 600
290A-A
Back
3mm above the ground
A-A view
Cable port
Entry cover plate
Ladder
Cable port
Angle steel for cable fixation
Front
On left and right
Operating mechanism compartment
Gas tank
550 1200242020801840
750
1482
30
1685
95
960
302
1990
1685
9801540
1200
800
240
1750
10# channel steel
10# channel steel
23
SecoRMU Requirement Datasheet
Customer Contact Person
Project Tel
Address Fax
Delivery Time E-mail
Power Supply Type⑥ Quantity
Quantity
Quantity
Rated Voltage 12kV□ 17.5kV□ 24kV□ Rated Current 630A□
Operating Voltage of Electric Mechanism
DC24V□ DC48V□ DC110V□ DC220V□ AC110V□ AC220V□
No.
Type①
Extension Mode
②
Cable's Entrance or Exit Mode
③
Operating Mechanism
Fuse Current④
CT/ PT Relay Protection
Cable Connector⑤
Quantity (Set)⑥
Remark
Manual
Electric
2CT/2PT
3CT/3PT
WIC1
MIFII
Individual Ring Main Unit
1 K □ □ / □ □ / /
2 T □ □ □ □ □ /
3 B □ □ / / / / / /
4 V □ □ / □ □ / □
5 C / / / □ □ / / /
6 M / / / □ □ / / /
7 PT / / / □ □ / / /
8 P / / □ □ / /
No.
Type①
Extension Mode
②
Cable's Entrance or Exit Mode
③
Operating Mechanism
Fuse Current④
CT/ PT Relay Protection
Cable Connector⑤
Quantity (Set)⑥
Remark
Manual
Electric
2CT/2PT
3CT/3PT
WIC1
MIFII
Common-tank Ring Main Unit
9K □ □ / □ □ / /
T □ □ □ □ □ /
10C / / / □ □ / /
T □ □ / □ □ □ /
24
No.
Type①
Extension Mode
②
Cable's Entrance or Exit Mode
③
Operating Mechanism
Fuse Current④
CT/ PT Relay Protection
Cable Connector⑤
Quantity (Set)⑥
Remark
Manual
Electric
2CT/2PT
3CT/3PT
WIC1
MIFII
11
K □ □ / □ □ / /
K / / □ □ / □ □ / /
T □ □ / □ □ □ /
12
K □ □ / □ □ / /
K / / □ □ / □ □ / /
K / / □ □ □ □ □ /
K □ □ □ □ □ /
13
K □ □ / □ □ / /
K / / □ □ / □ □ / /
T / / □ □ □ □ □ /
T / / □ □ □ □ □ /
T □ □ □ □ □ /
Optional Accessories
14
Name Quantity Name Quantity Others
Operating Handle Check Phase Apparatus
Padlock Auxiliary Contact ( 1NO+ 1NC)
Busbar Connector Busbar Terminal Plug Cover
Note①: 1) K – Load switch unit; T - Load switch-fuse combined unit; B - Bus tie unit; V - Vacuum circuit breaker unit; C - Busbar lift unit; M - Metering unit; PT – PT unit.
2) Common-tank ring main unit is combined freely by individual C, T or K ring main unit. A common-tank RMU can be assembled by maximum 5 individual units.
Note②: Please remark the extension mode of the RMU products. Remark "D" if it's right extendible. Remark "I" if it's left extendible. Remark "ID" if it's both sides extendible. Remark "\" if it's not extendible.
Note③: Please remark the cable's entrance or exit mode if the RMU is connected by cable. Remark "R" if it's right entrance-exit. Remark "L" if it's left entrance-exit. Remark "LR" if it's both sides entrance-exit. Remark "\" if there is no entrance-exit cable.
Note④: Please refer to transformer-fuse selection table (shown in page 14) for reference.Note⑤: Please remark the specifications (such as size, type etc.) of the cable connector. Note⑥: Example: please fill the blank of quantity item "9" if the scheme is P+K+M+TT+B+TT+M+K+P.
Printing Code: IN201103186EN
GE EnergyIndustrial Solutions
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