New Compact Gas Insulated Ring Main Unit

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.

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


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



- 630A bus bar

- Earthing bar



shaft

- Operating mechanism interlock

between vacuum circuit breaker

and disconnector


sensors


- Protection relay and protection CT



- Electrical operating mechanism of


DC24/48/110/220V,

AC110/220V

- Closing coil

DC24/48/110/220V,

AC110/220V

- Opening coil

DC24/48/110/220V,

AC110/220V


- Arrester

- Cable terminals

- Auxiliary switch for vacuum circuit

breaker position

4NO+4NC

- Auxiliary switch for disconnector

position

2NO+2NC


switch position

1NO+1NC

Used in circuit

protection, motor

protection and

transformer protection.

350×800×1380


/200kg

SchemeType


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



- 630A bus bar

- Earthing bar



shaft


sensors




- Electrical operating mechanism

DC24/48/110/220V,

AC110/220V

- Opening coil

DC24/48/110/220V,

AC110/220V

- Short circuit and earth fault

indicator


- Arrester

- Cable terminals

- Load break switch position

auxiliary contacts

3NO+3NC


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


/180kg

10

SER-B Bus Tie Unit

SER-V+SER-C1 Vacuum circuit breaker & Bus tie unit

SchemeType


SER-B

Bus tie unit

- Two position load break switch

- Operating mechanism

- Switch position indicator


- 630A bus bar


- Left/right entrance or exit

cable


- 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


/160kg

SchemeType


SER-V+SER-C1

Vacuum circuit breaker

& Bus tie unit

- Three position disconnector and

earthing switch

- 630A vacuum circuit breaker

- Operating mechanism of the


- Mechanical interlock and position

indicator for vacuum circuit breaker

and three position disconnector and

earthing switch



- 630A bus bar

- Earthing bar


switch and the door/operation shaft

- Operating mechanism interlock

between vacuum circuit breaker

and disconnector


sensors


- Relay and protection CT

- Electrical operating mechanism of


DC24/48/110/220V,

AC110/220V

- Closing coil

DC24/48/110/220V,

AC110/220V

- Opening coil

DC24/48/110/220V,

AC110/220V


- 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


/300kg

11

SER-C Bus bar lift unit

SchemeType


SER-C

Bus bar lift unit

- 630A bus bar


- Earthing bar

- C1 Air insulated adopted

- C2 SF6 gas insulated adopted

Used for incoming

or outgoing cable

connection.

350×800×1380


/100kg

SER-M Metering unit

SchemeType


SER-M

Metering unit

- 630A bus bar

- Two current

transformers

- Two potential

transformers

- Fuse for protecting PT


- Three current

transformers

- Three potential

transformers

- Arrester

- A watt-hour meter

- A var-hour meter

Used for electric power

measurement.

600×800×1380


/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


- Three potential

transformers

- Disconnector

- Arrester

Used for monitoring

the bus bar voltage,

providing voltage-lost

signal.

600×800×1380


/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



- 630A bus bar

- Earthing bar

- Interlock between the

earthing switch and the

door/operation shaft

- Cable bushings with

integrated sensors


- 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


/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


③

Operating Mechanism

Fuse Current④


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


③

Operating Mechanism

Fuse Current④


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

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New Compact Gas Insulated Ring Main Unit

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