le unimix wcb wsb(en) 1vcp000284
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8/9/2019 Le Unimix Wcb Wsb(en) 1vcp000284
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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.
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