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Medium Voltage Products

UniMix – WCB – WSB Air insulated switchgear for secondary distribution

•LSC2B-PItypeswitchgearaccording

totheIEC62271-200Standard

•Withdrawablecircuit-breakerwith

racking-inandisolationwithdoor

closed

•Standardandarcproofversionswith

IACAFLRclassication

•Earthingswitchwithfullmakingcapacity

•Possibilityofwallmounting

Description

MediumvoltageUniMixswitchgearwithWCB-WSBunits

complieswiththeIEC62271-200Standardandaresuitable

forsecondarydistributionapplicationswherehighperforman-ces are required, and guarantee:

1.Servicecontinuity

2.Safety

3.Highelectricalcharacteristics

1. Why service continuity

 TheWCB-WSBunitsareLSC2B/PIclassified:

LSC• (Loss of ServiceContinuity)describesthepossibilityof

keepingothercompartmentsand/orpanelsenergizedwhileacompartmentinthemaincircuitisopen.

PI• (PartitionmadeofInsulatingmaterial)describes

thecharacteristicofthepartitionsbetweentheunit

compartments

InLSC2Bclassifiedswitchgearitispossibletoaccessthe•

circuit-breakercompartmentduringordinarymaintenance

withoutputtingthefollowingoutofservice:

1.thebusbarsandadjacentfunctionalunits

2.thecablecompartment

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E

D

C

 A

B

 A Low voltage compartment

B Busbar compartment

C Insulating shutters

D Circuit-breaker compartment

E Cable compartment

UniMix–WBC-WBS Air insulated switchgear for secondary distribution

Busbar,feederandapparatuscompartmentarephysically

andelectricallysegregatedbyinsulatedshutters.

 

Ratedvoltage kV 24

Insulationlevels kV 24/50/125

Ratedshort-timewithstandcurrent kA(3s) ...20

Ratedshort-timewithstandcurrent kA(1s) 16-20-25

Peakcurrent kA 40,50,62,5

Internalarcwithstandcurrent kA(1s) 16

Ratedmainbusbarcurrent  A 630/1250

Branch connection rated current A 630/1250

 Tested according to IECStandards

Overalldimensions

of the basic unit

H mm 195 0

Wmm 750

D mm 1310

WCB Panel

 Theprojectincludestheuseof:  

-Vacuumcircuit-breakers •

-Gascircuit-breakers •

-Earthingswitch •

-Currenttransformers D IN/Toroidal type •

-Voltagetransformers DINtype •

-Sensors DINtype •

WSB Panel

 Theprojectincludestheuseof:  

-Vacuumcircuit-breakers •

-Gascircuit-breakers •

-Earthingswitch •

-Currenttransformer DINtype •

-Voltagetransformer DINtype –

-Sensors DINtype •

H

D W

2. Why safety

• IAC (Internal Arc Classified)AFLR16kA1s.UniMixswitch-

gearinthearcproofversionguaranteemaximumpersonnel

safetyevenintheeventofanarcoccurringinsidetheunit.

Theswitchgeararebuilttoresisttheoverpressurescau-

sedbytheinternalarcandspecialductsconveythegases

producedbythearctowardstheoutsideoftheswitchgear.

 Thefollowingmechanicalinterlocksarepresent:•

-circuit-breakerrackingin/outintheclosedposition;

-circuit-breakerclosingintheintermediatepositions

between“connected”and“isolated”;

-compartmentdooropeningifthecircuit-breakerisnotisolated;

-truckconnectionwiththecompartmentopen;

-circuit-breakerrackinginwiththecompartmentdoor

open;

Technical characteristics

-circuit-breakerrackinginwhentheearthingswitchis

closed;

-earthingswitchclosingwhenthecircuit-breakerisracked

in;

-cablecompartmentopeningwiththeearthingswitch

open;

-earthingswitchopeningwiththecablecompartment

open.

Mechanicalpushbuttonsforemergencyopeningand•

closingwiththecircuit-breakercompartmentdoorclosed

(onrequest).

3. Why high electrical characteristics

Ratedcurrentupto1250A•

Shortcircuitcurrentupto25kA(1sec)upto24kV•

Earthingswitchmakingcapacityupto62.5kAp.•

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Typical cross-sections

 VD4/UStypevacuumcircuit-breakersorHD4/USgasinsulated

circuit-breakerswithfrontoperatingmechanismareusedinthe

WCBandWSBunits.

 Thewithdrawablecircuit-breaker,completewithrelativetruck,canbeoperatedwiththedoorclosedbymeansofanopera-

tingmechanismoutsidethecompartment.

Withtrucktranslation,segregationofthelivexedparts(bu-

shinginsulators)fromtheaccessiblepartofthecompartmentis

obtainedautomaticallybyactivatingaspecialinsulatingshutter.

 

Insidethecompartment,thecircuit-breakercantakeupthe

followingpositions:

Connected

Maincircuitsandauxiliarycircuitsconnected.

Test position

Maincircuitsdisconnectedandauxiliarycircuitsconnected.

Isolated

Mainandauxiliarycircuitsdisconnected.

Intheisolatedposition,thecircuit-breakercanberackedout

ofthecompartmentusinganexternaltruck.

WCB Unit WSB Unit

  VD4/US circuit-breakers. HD4/US circuit-breakers.

HD4/USor

 VD4/US

HD4/USor

 VD4/US

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 ABB S.p.A.

Power Products Division

Unità Operativa Sace-MV

 ViaFriuli,4

I-24044Dalmine

 Tel.:+390356952111

Fax:+390356952874

e-mail:sacetms.tipm@it.abb.com

www.abb.com

Contact us

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 Thedataandillustrationsarenotbinding.Wereservetherighttomakechangeswithoutnoticeinthecourseoftechnicaldevelopmentoftheproduct.

Copyright2009ABB.

 Allrightsreserved.