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MediumVoltageBusductSystem Overview

Introduction

PowerbarManufacturesandprovidewiderangeofMediumvoltagebusductanditsaccessories.

ProductRange

Isolatedphasebusduct.(11kVto33kVupto25000AAircooled). Segregatedphasebusduct.(3.3kVto33kVupto5000A). NonSegregatedphasebusduct.(0.415kVto3.3kVupto5000A). DCBusductSystem. LAVTCubicles. NeutralGroundingCubicles. Lineandneutralsideterminalboxes. PressurizationSystemforIPBD. HotAirblowingsystem.

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IsolatedPhaseBusduct

APPLICATION

UsedinPowerGeneratingStationsconnections,interconnectionbetweengenerator

anditsassociatedgeneratortransformer,unit

transformerandassociatedauxiliaryequipment.

Eachphaseconductorismountedinseparate

enclosure&iscapableofcarryingmuchhigher

currentforagivenpermissibletemperatureasthe

availableareaofheatdissipationismuch

comparedtoSPB(SegregatedPhaseBusduct&

NSPB(NonSegregatedPhaseBusduct)

RATINGS

11kVto33kV,Upto25000A&50/60Hz.

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Crosssectionview

SalientFeatures

IndependentPhase:Nearlynilmutualinduction. VoltageriseinEnclosure:VeryLow Excellentshieldingundershortcircuitconditions:Neareliminationofforces. Negligibleinductionwithneighboringequipment:Noheatandlosseffect. IndependentEnclosures:PhasetoPhasefaultimpossible. Continuouslyweldedenclosures:

Nowateranddustingress.

Betterinsulationresistance.

Enhancedefficiencyofboltedcontacts.

Freemovementofconductorduringexpansion:Nocantileverforcesoninsulators. Enclosuresinsulatedfromsupportstructures:

Avoidsundesirableinducedcirculatingcurrentbeyondregularpath.

Noundesirablecurrentloopsandhencenoheatinginsupportingbeams.

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Ty

icalLay

Isolate

individ

Thebu

ut

PhaseB

almetal

maybes

sduct(IP

ousings

elfcooled

)isonei

paratedf

bymean

whichea

omadjac

ofcircul

chphase

entcondu

tingairin

onductor

ctorhousi

sidethep

isenclos

ngbyan

haseencl

dbyan

irspace.

sure.

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Accessories

1.Enclosure

2.Conductor

3.Conductor(Insulator)

4.ConductorRigid&ExpansionJoint

5.RubberBellow

6.Termination

at

Equipment

End

(Copper

flexible)

7.Wallframeassemblywithsealofbushing

8.SupportingStructure

9.Hotairblowersystem

10.CurrentTransformer

11.LAVTCubicles/Panels

12.NGCubicles/Panels

13.Airdryerwithcompressorandairpressurization

system

14.FilterDrainPlug

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StandardApplicable

IEEEC37.23/BS159/IS:8084

Test

TypeTest

Shorttimecurrentwithstandtest Impulsevoltagewithstandtest Temperaturerisetest

RoutineTest

DryPowerfrequencyvoltagewithstandTest Insulationresistancetest Paintcoatingthicknessmeasurement WeldingXRaytesting Dyepenetrationtest

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SegregatedPhaseBusduct

APPLICATION

SegregatedPhaseBusductisdesignedwithconductorsenclosedinacommonenclosure

andwithmetallicbarriersbetweeneachofthreephases.

Theirdesignandconstructionprovidesthestrengthrequiredforheavydutyserviceand

extremeshortcircuitconditions.Operatableinawidevariationofclimaticconditions;

especiallyincaseswhereitisnotpossibletoutilizeapplicationofIsolatedPhaseBusduct

forspaceorbudgetrestrictions.

RATINGS

3.3kVto33kV,Upto5000A&50/60Hz.

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Crosssectionview

SalientFeatures

3PhBusducthousedincommonmetallicenclosure.Phasessegregatedbynonmagnetic/insulatingbarrier.

Excellentshieldingeffectonbusbarsduringshortcircuitconditions. ReducetheeffectofProximitybetweenphases. DesignedforIP55classofprotection.

Avoidsundesirableinducedcirculatingcurrentbeyondregularpath.

Noundesirablecurrentloopsandhencenoheatinginsupportingbeams.

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TypicalLayout

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Accessories

1. Enclosure2. Conductor3. Conductorsupport(Insulator)4. PhaseBarrier5. ConductorRigid&ExpansionJoints6. Grounding Conductor7. InspectionCover/Opening8. RubberBellow9. TerminationatEquipmentEnd10.Wallframeassemblywithseal ofbushing11.SpaceHeater&Marshaling Box12.FilterDrainPlug13.SupportingStructure

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StandardApplicable

IEEEC37.23/BS159/IS:8084

Test

TypeTest

Shorttimecurrentwithstandtest Impulsevoltagewithstandtest Temperaturerisetest

RoutineTest

Drypowerfrequencyvoltagewithstandtest Insulationresistancetest Continuityofauxiliarywiring Paintcoatingthicknessmeasurement WeldingXRaytest Dyepenetrationtest

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NonSegregatedPhaseBusduct

APPLICATION

Nonsegregatedphasebusductsaredesignedforuseoncircuitswhoseimportancerequires

greaterreliabilitythanpowercablesprovide.Typicalofsuchapplicationsarethe

connectionsfromtransformerstoswitchgearassembliesinunitsubstations,connections

fromswitchgearassembliestorotatingapparatus,andtieconnectionsbetweenswitchgear

assemblies.

Nonsegregatedphasebusductisanassemblyofbusconductorswithassociated

connections,jointsandinsulatingsupportsconfinedwithinametalenclosurewithout

interphasebarriers.

The

conductors

are

adequately

separated

and

insulated

from

each

other

and

grounded

byinsulatingbussupports.

RATINGS

0.415kVto3.3kV,Upto5000A&50/60Hz.

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Crosssectionview

TherearebasictwotypeofNSPB

ConventionalType(Outdoor/Indoor)Inconventionaltypeconductorsoragroupofconductorsforeach phaseareadjacentto

theotherphase.ConfigurationofconductorisR,Y,BorR,Y,B,N.

ConventionalType

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InterleavedType(Outdoor/Indoor)Interleavedarrangementofconductorsreducedthenonuniformityofcurrentdistribution

duetoskineffectandproximityeffectwhichdependonthedistancebetweenconductors.

Interleavedofferslower&balancedimpedancewhichbecomeimportantforlongbusduct

wherevoltagedropiscritical.

InterleavedType

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SalientFeatures

3Ph3wireor3Ph4wirelowvoltageBusduct. Commonmetallicenclosurewithnophasesegregation. ConductorsupportedwithFRP/Epoxy/SMC/Polyamideinsulators. MostlyFlatAl/Cuconductorareused. DesignedforIP55classofprotection ForOutdoorcanopytypeenclosure.

TypicalLayout

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Accessories

1. Enclosure2. Conductor3. Conductorsupport(Insulator)4. ConductorRigid&ExpansionJoints5. GroundingConductor6. InspectionCover/Opening7. RubberBellow8. TerminationatEquipmentEnd9. WallframeassemblywithsealofPlate/bushing10.SpaceHeater&Marshaling Box11.FilterDrainPlug12.SupportingStructure

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StandardApplicable

IEC604391andIEC604392/IS:8623

Test

TypeTest

Shorttimecurrentwithstandtest Temperaturerisetest

RoutineTest

Drypowerfrequencyvoltagewithstandtest Insulationresistancetest Continuityofauxiliarywiring Paintcoatingthicknessmeasurement WeldingXRaytest Dyepenetrationtest

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