18.1 StaticStatic // ElectronicElectronic timerstimers of of rangerange (0(0
‐‐
6060 secs)secs) shallshall bebe usedused inin thethe starstar‐‐
deltadelta starter.starter.
18.2
18.2 Off Off
‐‐
delaydelay staticstatic // ElectronicElectronic timerstimers of of (0(0‐‐
120120 secs)secs) shallshall bebe usedused inin thethe capacitorcapacitor circuitscircuits 18.3
18.3 TimersTimers toto bebe usedused inin thethe lightinglighting circuitscircuits shallshall bebe of of digitaldigital typetype withwith 2424 hrhr setting
setting rangerange andand batterybattery backback
‐‐
upup forfor dawndawn andand duskdusk controlcontrol of of thethe lightinglighting feeders.feeders.
19.0
19.0 RelaysRelays 19.1
19.1 AllAll protectiveprotective relaysrelays shallshall bebe backback connected,connected, drawdraw outout type,type, suitablesuitable forfor flushflush mounting
mounting andand fittedfitted withwith dustdust tighttight covers.covers. AllAll relaysrelays shallshall bebe mountedmounted onon thethe front
front of of thethe panelpanel andand shallshall bebe specifiedspecified asas perper requirement.requirement. TheThe currentcurrent andand thethe voltage
voltage coilscoils shallshall bebe ratedrated asas specified.specified.
19.2
19.2 AllAll relaysrelays shallshall havehave builtbuilt
‐‐
inin flagflag // indicatorindicator toto indicateindicate operation.operation. AllAll trippingtripping relaysrelays shallshall bebe suitablesuitable toto operateoperate onon thethe specifiedspecified DCDC voltage.voltage.
19.3
19.3 AutomaticAutomatic powerpower factorfactor correctioncorrection relayrelay shallshall bebe providedprovided whereverwherever specifiedspecified toto maintain
maintain thethe powerpower factorfactor inin aa particularparticular busbus sectionsection atat prepre
‐‐
setset value.value. ThisThis relayrelay shallshall bebe of of micromicro processorprocessor basedbased type.type. TheThe numbernumber of of stepssteps toto switchswitch ONON // OFFOFF the
the capacitorcapacitor feedersfeeders shallshall bebe providedprovided inin thisthis relayrelay asas specifiedspecified inin thethe drawings.drawings.
19.4
19.4 TimerTimer relayrelay of of staticstatic typetype withwith 00
‐‐
1sec1sec timetime delaydelay shallshall bebe providedprovided forfor discrepancydiscrepancy function,function, whereverwherever applicable.applicable.
20.0
20.0 MetersMeters andand TransducersTransducers 20.1
20.1 TrivectorTrivector metersmeters shallshall bebe capablecapable of of indicatingindicating allall phasephase instantaneousinstantaneous PARAMETERS
PARAMETERS andand recordingrecording kWH,kWH, kVARHkVARH andand kVAH.kVAH. TheseThese shouldshould bebe suitablesuitable for
for 33 phase,phase, 44 wirewire 5050 HzHz circuitscircuits withwith unbalancedunbalanced loadingloading andand withwith threethree setssets of of elements
elements connectedconnected toto currentcurrent andand potentialpotential transformerstransformers of of specifiedspecified ratio.ratio.
The
The trivectormetertrivectormeter shallshall bebe digitaldigital type,type, classclass 0.50.5 oror betterbetter withwith communicationcommunication port,port, RS
RS 485485 interface–interface– MODBUSMODBUS
‐‐
RTURTU protocol,protocol, forfor hookinghooking upup toto PCPC // DCS.DCS. TheThe metermeter shallshall havehave datadata retentionretention facilityfacility inin thethe eventevent of of supplysupply sourcesource failurefailure forfor minimum
minimum oneone monthmonth period.period. TheThe metersmeters shallshall alsoalso bebe capablecapable of of indicatingindicating thethe total
total harmonicharmonic levelslevels upup toto 25th25th harmonicharmonic inin thethe systemsystem forfor currentcurrent asas wellwell asas inin voltage
voltage parameters.parameters.
20.2
20.2 DigitalDigital energyenergy metersmeters shallshall bebe capablecapable of of indicatingindicating allall phasephase INSTANTANEOUSINSTANTANEOUS parameters
parameters andand recordingrecording kWh.kWh. TheseThese shouldshould bebe suitablesuitable forfor 33 phase,phase, 44 wirewire 5050
Hz
Hz circuitscircuits withwith unbalancedunbalanced loadingloading andand withwith threethree setssets of of elementselements connectedconnected to
to currentcurrent andand potentialpotential transformerstransformers of of specifiedspecified ratio.ratio. TheThe energyenergy metermeter shallshall be
be of of digitaldigital type,type, classclass 0.50.5 oror better,better, withwith RSRS 485485 communicationcommunication portport andand suitable
suitable forfor communicatingcommunicating toto ‘Energy‘Energy ManagementManagement System’System’ withwith MODBUSMODBUS
‐‐
RTURTU Protocol.Protocol. TheThe metermeter shallshall havehave datadata retentionretention facility,facility, asas specified.specified.
20.3
20.3 TestTest terminalterminal blocksblocks shallshall bebe providedprovided inin thethe incomerincomer panelspanels forfor TVMTVM meter.
meter.
20.4
20.4 TheThe analoganalog meters,meters, whereverwherever provided,provided, shallshall bebe of of flushflush mountingmounting typetype withwith square
square patternpattern of of sizesize 144144 mmmm forfor incomerincomer feedersfeeders andand 9696 mmmm dialdial sizesize forfor outgoing
outgoing feeders.feeders. TheThe dialdial shallshall havehave blackblack numeralsnumerals withwith aa whitewhite backgroundbackground and
and shallshall bebe freefree fromfrom parallaxparallax errors.errors. TheThe metersmeters shallshall havehave provisionprovision forfor zerozero adjustment
adjustment outsideoutside thethe cover.cover.
21.0
21.0 CurrentCurrent TransformersTransformers 21.1
21.1 TheThe currentcurrent transformerstransformers shallshall bebe of of barbar primaryprimary woundwound secondarysecondary castcast resinresin type
type andand havehave aa shortshort timetime withstandwithstand ratingrating equalequal toto thatthat of of thethe associatedassociated switchgear
switchgear forfor oneone second.second. ItIt shallshall bebe thethe responsibilityresponsibility of of thethe vendorvendor toto coco
‐‐
ordinate
ordinate thethe burdenburden of of thethe CTsCTs withwith thethe actualactual requirementrequirement of of relays,relays, instruments,
instruments, andand leadsleads etc.,etc., associatedassociated withwith thethe particularparticular CTs.CTs. TheThe minimumminimum requirement
requirement shallshall bebe 55 VAVA burden,burden, accuracyaccuracy classclass 1.01.0 andand anan instrumentinstrument safetysafety factor
factor of of 5.5. CTsCTs withwith 0.50.5 // 0.20.2 accuracyaccuracy classclass shallshall bebe provided,provided, whereverwherever specified.
specified.
21.2
21.2 TheThe CTsCTs shallshall bebe providedprovided withwith thethe following:following:
•
• TestTest linkslinks inin bothboth secondarysecondary leadsleads toto carrycarry outout phasephase angleangle andand currentcurrent measurement
measurement tests.tests.
•
• EarthEarth linklink toto whichwhich thethe leadsleads of of thethe CTsCTs shallshall bebe connectedconnected soso asas toto facilitatefacilitate easy
easy measurementmeasurement of of InsulationInsulation ResistanceResistance of of thethe CTs.CTs.
22.0
22.0 PotentialPotential TransformerTransformer 22.1
22.1 TheThe potentialpotential transformertransformer shallshall bebe castcast
‐‐
resinresin insulatedinsulated type.type. InsulationInsulation of of PTPT shallshall bebe suitablesuitable forfor unearthedunearthed system.system. ItIt shallshall bebe drawdraw outout typetype andand easilyeasily accessible
accessible soso thatthat thethe samesame cancan bebe attendedattended toto oror replacedreplaced whenwhen thethe panelspanels areare in
in serviceservice condition.condition. TheThe PotentialPotential transformerstransformers shallshall bebe of of singlesingle phasephase type,type, nono three
three phasephase typetype shallshall bebe used.used.
22.2
22.2 TheThe potentialpotential transformerstransformers shallshall bebe protectedprotected throughthrough HRCHRC fusesfuses onon primaryprimary side
side andand MCBsMCBs onon secondarysecondary side.side. TheyThey shallshall havehave ratios,ratios, outputsoutputs andand accuraciesaccuracies specified.
specified.
CUSTOMER
CUSTOMER ::
EPC
EPC CONTACTOR CONTACTOR ::
DOC.NAME
DOC.NAME :: TECHNICAL TECHNICAL SPECIFICATION SPECIFICATION FOR FOR LT LT SWITCHGEAR SWITCHGEAR
23.0
23.0 ControlControl TransformersTransformers 23.1
23.1 InIn mainmain PCCPCC panelspanels twotwo numbersnumbers of of controlcontrol transformerstransformers withwith oneone asas standbystandby shall
shall bebe provided.provided. TheThe ratingrating of of thesethese transformerstransformers shallshall bebe sizedsized toto feedfeed toto ACBACB closing
closing coils,coils, ACBACB springspring chargingcharging motormotor coilcoil andand alsoalso forfor underunder voltagevoltage releaserelease of
of thethe incomersincomers andand tietie feeders.feeders. SeparateSeparate reducantreducant transformerstransformers withwith changeover
changeover arrangementarrangement shallshall alsoalso bebe providedprovided forfor feedingfeeding toto thethe controlcontrol devicedevice requirements
requirements of of thethe panel,panel, panelpanel illumination.illumination.
23.2
23.2 InIn casecase of of MCCMCC panels,panels, minimumminimum twotwo (2)(2) numbersnumbers controlcontrol transformers,transformers, withwith one
one asas standby,standby, shallshall bebe providedprovided inin eacheach switchswitch boardboard forfor meetingmeeting controlcontrol andand auxiliary
auxiliary supplysupply requirementrequirement of of thethe individualindividual modules.modules. RatingRating of of controlcontrol transformer
transformer shallshall bebe sizedsized toto feedfeed allall controlcontrol devicedevice requirementrequirement of of panel,panel, panelpanel illumination
illumination spacespace heaterheater of of motormotor circuits.circuits.
23.3
23.3 TheThe transformerstransformers shallshall bebe providedprovided withwith independentindependent MCCBMCCB // SFUSFU atat primaryprimary with
with arrangementarrangement toto selectselect oneone atat time.time. TheThe transformerstransformers shallshall bebe adequatelyadequately sized
sized toto deliverdeliver 240V240V AC.AC. SupplySupply shallshall bebe protectedprotected againstagainst shortshort circuitscircuits andand over
over loadsloads onon primaryprimary asas wellwell asas secondarysecondary side.side. ControlControl transformers,transformers, SFU,SFU, selector
selector switchesswitches andand contactorscontactors shallshall bebe sizedsized toto feedfeed instrumentinstrument loadsloads andand space
space heaters,heaters, asas specifiedspecified technicaltechnical specification.specification. TheThe controlcontrol transformertransformer change
change overover switchesswitches shallshall bebe of of doordoor mountedmounted type.type. AlsoAlso thethe controlcontrol transformer
transformer shallshall bebe sizedsized toto feedfeed singlesingle phasephase motormotor feeders,feeders, whereverwherever specified
specified 24.0
24.0 PushPush Buttons,Buttons, ControlControl SwitchesSwitches andand PilotPilot LampsLamps 24.1
24.1 TheThe pushpush buttonsbuttons shallshall bebe of of shroudedshrouded typetype withwith actuatoractuator providedprovided withwith escutcheon
escutcheon platesplates markedmarked withwith itsits functionfunction onon it.it.
24.2
24.2 ControlControl switchesswitches shallshall bebe of of thethe heavyheavy dutyduty rotaryrotary typetype withwith namename platesplates clearlyclearly marked
marked toto showshow thethe operation.operation. TheyThey shallshall bebe semisemi
‐‐
flushedflushed mountingmounting withwith onlyonly thethe frontfront plateplate andand operatingoperating handlehandle projecting.projecting. CircuitCircuit breakerbreaker controlcontrol switchesswitches shall
shall bebe of of thethe springspring returnreturn toto neutralneutral type,type, whilewhile locallocal // remoteremote selectorselector switches
switches andand instrumentinstrument selectorselector switchesswitches shallshall bebe of of thethe staystay
‐‐
putput type.type.24.3
24.3 TheThe indicatingindicating lampslamps shallshall bebe of of clustercluster LEDLED typetype of of lowlow wattwatt consumption.consumption. TheyThey shall
shall bebe providedprovided withwith seriesseries resistors.resistors.
25.0
25.0 InterconnectionsInterconnections
25.1
25.1 AllAll switchgearswitchgear cubiclescubicles shallshall bebe suppliedsupplied completelycompletely wiredwired internallyinternally toto equipment
equipment andand terminalterminal blocksblocks andand readyready forfor PURCHASER'sPURCHASER's externalexternal connections
connections atat thethe outgoingoutgoing terminalterminal blocks.blocks. InterconnectionInterconnection betweenbetween allall compartments
compartments andand marshallingmarshalling cabinetscabinets shallshall alsoalso bebe completed.completed.
25.2
25.2 TheThe wiringwiring shallshall bebe completecomplete inin allall respectsrespects soso asas toto ensureensure properproper functioningfunctioning of
of control,control, protectionprotection andand interlockinginterlocking schemes.schemes.
25.3
25.3 PowerPower interconnectionsinterconnections insideinside thethe panelpanel shallshall bebe donedone withwith 650/1100650/1100 VV gradegrade single
single corecore PVCPVC insulatedinsulated coppercopper conductorconductor upup toto 6363 AmpsAmps ratingrating andand aboveabove 6363 Amps
Amps ratingrating byby coppercopper flats.flats. WhereverWherever coppercopper withwith CopperCopper dirt’sdirt’s areare mademade bibi
‐‐
metallic
metallic connectorsconnectors // contactorscontactors shouldshould bebe used.used. ControlControl wiringwiring shallshall bebe donedone with
with 650/1100650/1100 VV gradegrade PVCPVC singlesingle corecore coppercopper conductorconductor of of minimumminimum crosscross section
section 2.52.5 Sq.mmSq.mm forfor CTCT wiringwiring andand 1.51.5 Sq.mm.Sq.mm. forfor others.others.
25.4
25.4 TheThe cablingcabling chamberchamber of of adequateadequate sizesize forfor accommodation,accommodation, supportsupport andand termination
termination of of coppercopper cablescables shallshall bebe providedprovided atat thethe rear.rear. FacilityFacility toto extendextend cabling
cabling areaarea byby additionaladditional cablecable chamberchamber shallshall bebe preferred.preferred.
25.5
25.5 AllAll wiringswirings andand cablescables atat thethe terminationsterminations atat thethe switchboardswitchboard shallshall havehave distinctdistinct marking
marking byby meansmeans of of ferrulesferrules withwith lettersletters // numeralsnumerals printedprinted correspondingcorresponding toto the
the wiringwiring diagramdiagram toto bebe furnishedfurnished byby thethe successfulsuccessful SUPPLIER.SUPPLIER.
26.0
26.0 TerminalTerminal BlocksBlocks 26.1
26.1 TheThe terminalterminal blocksblocks providedprovided inin thethe switchboardswitchboard shallshall bebe mountedmounted verticallyvertically near
near thethe bottombottom sideside of of eacheach modulemodule unit,unit, inin thethe cablecable chamberchamber atat aa slightlyslightly upward
upward angle,angle, toto provideprovide clearclear andand easyeasy accessaccess toto thethe terminals.terminals.
26.2
26.2 EachEach wirewire atat terminalterminal blocksblocks shallshall bebe distinctlydistinctly identifiedidentified withwith appropriateappropriate number
number // letterletter ferrulesferrules atat eacheach endend inin accordanceaccordance withwith thethe schematics.schematics.
26.3
26.3 WiringWiring toto thethe doordoor shallshall bebe donedone byby flexibleflexible cablecable andand thethe cablescables shallshall bebe bunched,
bunched, sleevedsleeved andand cleatedcleated soso thatthat nono mechanicalmechanical damagedamage cancan occuroccur toto thethe cables
cables whenwhen thethe doordoor swings.swings.
26.4
26.4 NotNot moremore thanthan 22 wireswires shallshall bebe terminatedterminated atat oneone controlcontrol terminal.terminal.
26.5
26.5 AllAll terminationsterminations shallshall bebe of of adequateadequate currentcurrent ratingrating andand sizesize toto suitsuit individualindividual feeder
feeder requirement.requirement.