WSMedium Voltage Gas Insulated Switchgear

Energy managers around the world all face the same issue:how to increase their HV and MV network capacities whilemaking them more efficient and smaller. They seek to reducelife cycle costs and substations size, increase safety and ecological features and still have equipment that is easy tooperate with minimal maintenance.

AREVA T&D’s Gas Insulated WS switchgear meets all these needs. WS is the switchgear of choice for customers around the world. It satisfies even the most demanding MV switchgear requirements forcritical applications such as HV/MV substations, large city power distribution, transportation, and industries such as oil & gas, petrochemical, mining and metallurgy processes that all require thehighest levels of reliability and availability possible.

MAIN CHARACTERISTICS

AREVA T&D’s WS is a fully gas-insulated switchgear equipment with ratings up to 36 kV, 2500 A and31.5 kA. It is a fixed switchgear design incorporating a vacuum circuit breaker with a three-positionswitch in series.

This field-proven switchgear offers a comprehensive range of functions and features and is available assingle busbar (WSA) or double busbar (WSB) unit, both with the same small footprint. Consequently, WSspace-saving modular design allows the reduction of the overall substations dimensions, the easy replacement of old switchboards in an existing building as well as the integration in a containerized substation. Moreover, the modular concept makes it possible to dismantle the circuit breaker with the busbars live.

WS ensures user-friendly and safeoperation, giving reliable operationstatus thanks to a clear mimic diagramintegrating mechanical positions andinterrogating interlocks.

WS meets the requirements of IEC,EN and the national provisions of theabove international standards.

GAS- INSULATED SWITCHGEAR

AREVA T&D

Customer benefits• Sealed-for-life Gas

insulation system • Hermetically enclosed

live parts • Insensitive to environmental

influences • Space-saving modular design• Long service life

and low maintenance

MODULAR DESIGN OF WSA AND WSB

In addition to the benefits of small footprint anddemountable circuit breaker, the modular design givesyou the opportunity to optimize your initial investmentwhile equipping the switchboard with spare panels.At any time in the future, these spare panels can bequickly completed by adding circuit breaker and lowvoltage modules, without the need to shutdown theswitchboard.

HIGH LEVEL OF RELIABILITY AND SAFETY

Independence from environmental influences, corrosionresistant gas-filled metal compartments made of CrNi steeland continuous, robust mechanical interlocking systemsensure maximum operating reliability and operator safety.The gas-insulated switchgear WS has been designed asa sealed pressure system to IEC 60694. Thus, it will notbe necessary to refill the compartment with gas duringthe operating life of the switchgear.

USER-FRIENDLY OPERATION AND INDICATION

Operation of WS is simple and safe, with clear displaysand reliable mechanisms:> Mimic diagram integrating mechanical position

indicators and logical operating facilities.> Interrogating interlocks for fool-proof protection

against mal-operation.> IVIS integrated voltage detection system for verification

of safe isolation from supply and phase rotation.> Central monitoring of gas pressure with the IGIS

digital, autonomous monitoring and sensor system.

Operation panel of WSB

B2

B1

C

D

A

Gas-insulated MV switchgear

Circuit breaker moduleBusbar compartment with 3-position switchBusbar compartment for double busbar optionSubframe and cable connection areaLow-voltage cabinet

A

D

C

B1

B2

WSMedium Voltage Gas Insulated Switchgear

THE OPTIMUM SOLUTION: VACUUM SWITCHING COMBINEDWITH GAS INSULATION

WS combines the advantages of gas insulation technology with those of vacuum interruptiontechnology:

>> All active medium voltage components, includingthe busbar system, are enclosed in hermeticallysealed, gas-insulated, metal compartment andare thus insensitive to humidity, corrosive atmosphere, dust, insects and small animals.

>> Vacuum interruption provides reliable load andfault switching operation. Our latest range ofinterrupters combines improved contact designwith proven manufacturing techniques to provideunrivalled performance with zero maintenancethroughout their life.

The combination of these two technologies enablesus to offer a cost-effective medium voltageswitchgear solution giving maximum reliabilityand minimum maintenance to ensure maximumplant availability and minimum life-cycle cost.

Feeder Cross couplingCross coupling in

single panel divison

Incoming feederwith plug-in voltage

transformer withdisconnector

Busbar voltagemea-surement

Feeder with busbarplug-in voltage

transformer withdisconnector

Busbar and currenttransformer

Busbar earthing

Sectionalizer

FeederSectionalizer with

circuit breaker

Incoming feederwith plug-in voltage

transformer withdisconnector

Busbar and currenttransformer

Busbar earthing Sectionalizer

WSA

WSB

WS Medium Voltage Gas Insulated Switchgear

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AREVA T&D Worldwide Contact Centre:http://www.areva-td.com/contactcentre/Tel.: +44 (0) 1785 250 070

www.areva-td.com

FAST REPLACEMENT OF OLD SWITCHGEAR

If you are replacing switchboards in an existing substationyou can often take advantage of the small footprint of WS.By installing WS in the corridor in front of the old switchboard, you can quickly transfer the cables from theold switchboard to the new WS switchboard with the minimum downtime and cost.

Basic dimensions (mm)Width 600Depth 1200Height 2300 (WSA)

2800 (WSB)

1

4

2

5

6

7

3

1 Control and indication panel

2 Low-voltage cabinet

3 Cable connection area

4 Current transformer

5 Circuit breaker compartment

6 Busbar compartment

7 Second busbar compartment (only WSB)

Double busbar system WSB

TECHNICAL CHARACTERISTICS

>> Rated voltage kV 12 15/17.5 24 36

>> Rated frequency Hz 50/60 50/60 50/60 50/60

>> Rated power frequency withstand voltage kV 28 38 (42) 50 70

>> Rated lightning impulse withstand voltage (BIL) kV 75 95 125 170

>> Rated current: busbar up to A 2500 1) 2500 2500 2500

>> Rated current: feeder up to A 2500 2500 2500 2500

>> Rated short-time withstand current (3s) up to kA 31.5 25 1) 25 1) 31.5

>> Rated peak withstand current up to kA 80 63 63 80

>> Internal arc tested to IEC60298, kA 31.5 25 25 31.5

Appendix AA, Criteria 1-6 (1s) up to

1) Higher ratings on request