This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Solid Dielectric Switchgear
Providing load and fault interrupting switching for systems rated through
38kV, 800A continuous, 12.5 and 16kA symmetrical interrupting
General FeaturesWorldWide experience and perFormanceSince 1905, G&W has been provid-ing custom electrical products andinnovative solutions to power usersaroundtheworld. Today,G&Wcon-tinues that traditionwitha full lineofsolid dielectric switchgear using theindustry’slatestinsulationtechnology.Tridentswitchgearcombinesthebestsolid dielectric insulation materialswithtimeproven,rugged,andreliableswitchingdesigns.Drawingonmanyyearsoffieldexperienceintheareasof loadbreak switchingand vacuumfault interrupter technology,G&Wof-fers one of the widest selections ofelectrical distribution switchgear intheindustry.
solid dielectric technoloGyTrident switchgear utilizes G&W’stimeproven,submersibleepoxypoly-mer system to fully encapsulate thevacuum interrupters. This systemprovides excellent insulation proper-ties and incorporates a permanentlybonded semi-conductive externalcoating providing a fully shielded,void-free construction. Internalshieldslimittheelectricalstressintheepoxy,thereforeincreasingitselectri-cal integrity. All modules are 100%factory tested for partial discharge.Dual ratio current transformers areencapsulated within each moduleprovidingeither500:1or1000:1pro-tectioncharacteristics.
submersibilitySolid dielectric switchgear is dead-front and fully submersible. Unitshave remained fully operable afterwithstanding years of submersion atdepthsofupto10feet(3m).
maintenance beneFitsSolid dielectric insulation means nomoreroutinemaintenanceaswithoilandairswitchgear.Soliddielectricin-sulation also offers an alternative toSF6insulateddevices.
application FlexibilitySoliddielectricswitchgearofferscom-pact, modular construction. Moduleconfigurations permit elbow styleconnections to be all front mountedor front/backmounteddependingonuserpreference.Thesamesizemod-ulescanfunctionaseitherloadbreakor fault interrupting. Three phaseswitches can be linked together tocreate tailoredmulti-wayswitchcon-figurations. Trident fault interruptersofferawidevarietyofelectronicover-current controls for customized sys-temprotectioncoordination.Automa-tioniseasywhetheritisanautomatictransferschemeorafullyintegrateddistribution automation “Smart Grid”project.
Page 2
p Three phase Trident-S fault interrupters in a submersible vault application.
ideal replacement For oil Fuse cutouts Tridentfaultinterruptersareanidealreplacementforsinglephaseorthreephaseoilfusecutoutsbyofferingthefollowingadvantages:
Fully testedTrident switches are designed andtestedtoapplicablestandardsinclud-ing IEEEC37.74 (IEEEC37.71 andC37.72),IEEE386,IEC60265,IEEE592and IEEE57.12.28. All fault in-terrupter devices must pass reclos-er-class duties as outlined in IEEEC37.60.
operatinG mechanism FlexibilityTrident-SP,SandSTswitchesincor-porate integralsinglephaseor threephase spring-assisted mechanismsfor positive open and close opera-tions. The operating mechanismsarelocatedwithinaweldedstainlesssteel housing, constructed to with-stand continuous submersible envi-ronments. The spring mechanismsoperate thevacuum interrupters,en-capsulatedwithintheepoxymodules,to accomplish load break switchingandfaultinterruptingprotection.Trident-SR switches incorporate aninternal magnetic actuator in placeof the spring-assisted mechanism,providinghighspeedoperation.Themagnetic actuator eliminates theneedforadd-onexternalmotorsandcablingmakingitanidealsolutionforautomatedswitchingapplications. cable entrance Flexibility Cable entrances canbeeither 200Awell or 600A separable connectorbushings for accepting elbow styleconnectors. The rugged epoxy sur-faceminimizestheforcerequiredforremoving elbow connections com-pared to rubber-to-rubber junctions.Different module orientations permitcableentry from the front, side, bot-tomorbackoftheunit.
interrupter control FlexibilityTridentswitchgearoffersavarietyofovercurrent controls including manySchweitzerEngineeringLaboratories(SEL) models for fault interruptingswitches to suitmost any protectionrequirement. All G&W controls areself-powered from the integral cur-rent transformers and offer over 30different Time Current Characteristic(TCC) curve families. Optional fea-tures include inrush protection (coldloadpickup), instantaneous,groundfault, time delay,minimum response
Modular Flexbility
time,andmanualtrippushbuttons.Othersmaybeprogrammedthrougha laptop computer, or with a frontpanel interface. Trident controlsmay be mounted within an externalNEMA4X(IP56)or6P(IP67)enclo-sure,orwithintheswitchmechanismhousing (IP68), eliminating the needfor external cabling. G&W can alsointegrate other manufacturer’s con-trols depending on user preference.
mountinG FlexibilityTridentswitchgearissuitableforsub-mersible vault or padmount installa-tions.Theymaybemountedverticallyorhorizontally,onawallorfloor,andinanyattitude. Thesmall footprint isidealforspacerestrictedapplications.Stainlesssteelmountingbracketsareavailableformaximumcorrosionresis-tance.Parkingstandsareavailable.
Operating Handle FlexibilityVarious styles of operating handlesare available depending upon userpreference. Handlescanbe remov-able or permanently fixed to theswitch. Handles can be straight orangledprovidingthebestmechanicaladvantage for operating personnel.Handles canbe locatedon the frontorsideoftheswitch.Allarehookstickoperable.
automation FlexibilityTrident switchgear is easily adaptedfor automation requirements. Fromsimple remote control through so-phisticated distribution automationschemes,G&Whastheproductsandintegrationexpertisetodothejob.
trident®-s three phase sWitchGearTrident-S threephase,spring-assist-ed switchgear is available for loadbreak or fault interrupting switching.TheTrident-Sisidealforthreephasedistributionswitchingandprotection,aswellasforthreephaseoilfusecut-outandoilswitchgearreplacements.Faultprotectioncanbeprovidedus-ingvacuum interrupterswith integralcurrenttransformersandavarietyofovercurrentcontrols.
p Vault style Trident-SR with front mounted bushings.
Trident-SR,highspeedmagneticac-tuator (3-1/2 cycles), SCADA readyswitchessimplifytheprocessofauto-matedswitchingandfaultinterruptiononsystemsratedthrough38kV.Theextremelyflexibledesignpermits theuser to customize the best solutionfor theirparticularapplication. Fromremote operation, to fully automateddistributionautomationorSmartGridschemes, theTrident-SR offersmul-tipleapplicationfunctionality,allwithinthe same compact switch footprint.Comparethesefeatures:
For load break switching -Therug-ged magnetic actuator is tested toover 10,000 mechanical load breakoperations.
For fault interrupting -AvarietyofSchweitzerEngineering Laborato-ries(SEL)relaysandG&Welectroniccontrolsareavailabletobestmeetthespecific protection needs of the ap-plication. Programmingusinga lap-top computer or built-in LCDdisplayareavailableoptions.G&Wcontrolsare powered by current transform-ershousedwithintheepoxymodule.Otherstylecontrolsarealsoavailable.
For remote operation - Hand heldremoteoperatorsareavailablepermittingpushbuttonoperationfromeitherabovegroundforvaultapplica-tionsorfromacontroladjacenttotheenclosureforpadmountapplications.
Viewing window
Drive rod
vacuum bottle
Encapsulated current transformer and voltage sensing
Manuel trip handle
High speed magnetic actuator
Manuel close handle
Encapsulated 200A well or 600A seperable connector bushings for elbow connectors
trident®-sr three phase sWitchGear
Page 7
SCADA ready automation -Current transformers encapsulatedwithin the epoxy modules provideintegralcurrentsensing.Integralca-pacitively coupled voltage screensprovide three phase analog voltagevaluesforconnectiontoawideselec-tionofrelaysandRTUs.
For Lazer® ready automation - Trident-SR switches are an integralpart ofG&W’spre-engineeredLazercontrolpackagetoprovideautomaticpowerrestoration.UsingSELrelayswithdistributedcapabilitiesandpeer-to-peercommunication,G&W’sLazersolution with Trident switchgear cangreatly simplify the automation pro-cess from small scale through largescalesystemrequirements.
For future Smart Grid - Thinking of automating in the nearfuturebut need switchesnow? Thebuilt-in features and application flex-ibilityoftheTrident-SRcanhelpsim-plifyyourdecision.
Compact, clean design - No add-on motors or linkage. Noexternalcurrent transformersorvolt-agesensorshangingfromelbowcon-nectors.Trident-SRswitchesfeaturebuilt-incomponents.
Submersibility -Solid dielectric switchgear is dead-front and fully submersible. Unitshave remained fully operable afterwithstandinga20footheadofwaterfor20days.
Contact position indicator -Alargeviewingwindowpermitsvisual verification of vacuum con-tact position, either open or close.The position indicator is connecteddirectly to the drive assembly. Inaddition, three different color LEDscanalsobeprovided to verify eitherPowerOK,Tripped,orBlockedposi-tion. LED verification of “open” and
“close”, inaddition to theflag indica-tor,canalsobetwoofthethreeLEDoptions.Anoperationcounterisalsoincluded.
Manual trip handle - A hookstick operable handle per-mits manual opening of the switch.Once opened, the switch is thenblocked from any remote com-mands thereby prohibiting anyclose operation. The open andblocked positions are padlockableproviding true mechanical lockout.
Manual close handle - Ahookstickoperablehandlepermitsmanualclosingofanelectronically tripped or manuallyopenedfaultinterrupter.
Cable entrance flexibility - Cable entrances canbeeither 200Awell or 600A separable connectorbushings for accepting elbow styleconnectors.In-lineordiagonalspreadversionconfigurationsareavailabletofacilitatecabletraining.
Trident-SR with integral Bypass Switch- ApproximateDimensions.Approx.Weight=900lbs.(408kg)CombinationTrident-SRwithTrident-SswitchpermittingtheTrident-SRanditsrelaytobefullytestedwithoutde-energizingthecircuit.
Trident-STthreephase,spring-assist-ed switchgear can provide eitherthree phase or single phase faultprotection.TheTrident-STisidealforthreephasedistributionswitchingandprotection,aswellasforthreephaseoil fuse cutout and oil switchgearreplacements. Fault protection canbe provided using vacuum interrupt-erswithintegralcurrenttransformersandavarietyofovercurrentcontrols.
* Contact your G&W representative for other configurations
Closest to Housing Away from Housing Code
200A 200A 2
200A 600A 3
600A 200A 4
600A 600A 6
hoW to order:Selectfromthevariouscatalogbreakdownchartoptionsbelow.Enterthedesiredselectioninthecorrespond-ingcatalognumberposition.
___3-____
1
2
3
4
5
6
7
Bushing Arrangement9
21 3 4 5 6 7 8
Example 3:Fault Interrupter with Integral Bypass Submersiblevaultstyle,15kV,threephase,faultinterrupterwithintegralbypassswitch,sidemountedhandleandall600Abushings.AnSEL-751Acontrolisrequired.The catalog number would be: WA13-RE9 SLB
Example 1:Automated Load Break SwitchVaultstyle,27kV,threephase,loadbreakswitchwithall600Abushings.Afrontmountedhandlewithahandheldcontrolisrequired.The catalog number would be: VB23-RL36
Example 2:Fault Interrupter with SEL351RConnectorized Control and Voltage SensingPadmountstyle,horizontal,frontaccess,spreadbushings,35kV,threephasefaultinterrupterwithall600Abushings.Afrontmountedhandleisrequired.The catalog number would be: HB33-RR06
Page 11
orderinG examples - trident®-s sWitchGear
600A
M
600A
200A
200A
200A
200A
orderinG examples - trident®-sr sWitchGear
600A
600A
600A
600A
orderinG examples - trident®-st sWitchGear
200A
200A
600A
600A
Example 1:Oil Fuse Cutout ReplacementVaultstyle,15kV,threephasefaultinter-rupterwithall200AdeepwellbushingsandaNEMA6PType2overcurrentcontrol.Asidemountedhandleisrequired.The catalog number would be: WA13-S202
Example 2:Automated Load Break SwitchVaultstyle,15kV,threephase,loadbreakswitchwithall600Abushings.AsidemountedmotoractuatorwithNEMA4Xstationarycontrolisrequired.The catalog number would be: VA13-SL36
Example 3:Fault interrupter with three phaseelectronic and manual trip, and three phase manual resetPadmountstyle,35kV,threephasefaultinterrupterwithall200AbushingsandaType7overcurrentcontrol.Asidemountedhandleisrequired.The catalog number would be: PA33-S702
Example 1:Oil Fuse Cutout ReplacementSubmersiblevaultstyle,15kV,threephasefaultinterrupterwithall200AdeepwellbushingsandaType1overcurrentcontrol.Afrontmountedhandleisrequired.The catalog number would be: WB13-T102
trident® multi-Way sWitchGear
p Flexible inter-way bus connection system provides reliable performance in a low profile, compact design.
p Automated padmount switch utilizing magnetic actuators and integral voltage sensing electronics for a high speed automatic transfer application.
Page12
Multi-wayTridentswitchesconsistofindividualthreephasemoduleslinkedtogether througha flexible inter-waybus connection. Design your ownswitch combination to ideally matchyourapplicationrequirements.Buildmultiple ways using the same stylemodules or combine Trident stylesS,ST,SPorSRinwhatevercombi-nationyoudesire. Modulesmaybeeitherfaultinterruptersorloadbreakswitches.
Padmount style, Trident-SR and Trident-ST, front / back accessApproximateDimensions.ApproximateWeight=2600lbs.(1182kg)
Padmount style, Trident-S front accessApproximateDimensions.ApproximateWeight=1800lbs.(817kg)
56"(1412mm)
81"(2064mm) 41"
(1041mm)
Trident-SRside Trident-STside
76"(1930mm)
p Typical One-line
t Typical One-line
Configurations A & C VaultWallMount,SideHandleApproximateWidthofSwitch3Way............................78”(1981mm)4Way............................103”(2616mm)5Way............................128”(3251mm)6Way............................153”(3886mm)ApproximateDepth.......21”(533mm)ApproximateHeight......35”(889mm)
Configurations B & DVaultWallMount,FrontHandleApproximateWidthofSwitch3Way............................66”(1676mm)4Way............................84”(2134mm)5Way............................102”(2591mm)6Way............................120”(3048mm)ApproximateDepth.......21”(533mm)ApproximateHeight......35”(889mm)
Vaultstylewithnon-submersibleelectronics(ifsupplied) V
Vaultstylewithsubmersibleelectronics(ifsupplied) W
21 3 4 5 6 7
1
2
3
4
5
6
7
Way 1
Phase Code
Single 1
Three 3
Page15
Example 1:3-Way Load Break with Auto Source TransferVaultstyle,25kVswitch.Ways1and3areloadbreakswitcheswithmagneticactuatorsandvolt-agesensingfortheautotransferandhave600Abush-ings.Way2isafaultinterrupterandhas200Abush-ings.FaultinterruptercontrolstobeType7.Allwaystohavesidemountedoperatingmechanisms/handles.ANEMA6PratedATC451controlused.The catalog number would be: WA23-RA4 S70 RA4.
Example 2:Bus Tie Switch with Two Unswitched WaysVaultstyle,15kV,threephase,loadbreakswitchwithtwounswitchedwaysandall600Abushings.Sidemountedhandlesarerequired.The catalog number would be: WA13-U00 SL0 SLT SL0 U00
Example 3:3-Way Combination Load Break and Fault Interrupter SwitchPadmountstyle,25kV,3-wayswitchwithtwo600Aloadbreakswitchmodules(ways1and3)andone200Afaultinterrupter(way2).FaultinterruptercontrolstobeType3.Switchoperatorstobefrontmountedwithallbushingsouttheback.The catalog number would be: PC23-SL0 S30 SL0.
orderinG examples - trident® multi-Way sWitchGear
600A 200A 600A600A 200A 600A
p Four-way front access, padmount Trident-S.
p Automated multi-way, Trident-S in a submersible vault installation.
600A 600A600A 600A
Page16
p Three-way, submersible vault, automatic transfer switch including submersible G&W ATC451 control.
Submersible Application Example
Installation shows a 3-way switch, frame mounted so the unit faces upward with side operating handles hookstick operable from above ground. The location is subject to complete submer-sion for extended periods of time. The yellow cable is con-nected to a laptop computer permitting programming of the overcurrent protection parameters for the switch.
Page17
Trident-SP single phase, spring-assisted switchgear is availablefor load break or fault interruptingswitching. The compact units areideal for switching residential loopsand for oil fuse cutout replace-ments. Fault protection can beprovided using vacuum interrupt-ers with integral current transform-ers and a variety of overcurrentcontrols.
Features •15.5,27,or29.3kV,630A continuouscurrent•12.5kAsymmetricalinterrupting•Padmountandvaultdesigns•Verticalorhorizontalmounting•Largeviewingwindowssimplify visualidentificationofopen (green)orclosed(red)vacuum contactposition.Theposition indicatorisconnecteddirectlyto thedriveassembly.•Hookstickoperable,permanent mountedoperatinghandles•Submersibleswitchconstruction•Submersiblecontrolsavailable•Manualoperation
orderinG examplesExample 1:Oil Fuse Cutout ReplacementVaultstyle,15kV,singlephasefaultinterrupter.ThefaultprotectionschemerequirestheoilfusecutoutTimeCurrentCharacteristic(TCC)curveandasinglephasesetting(Type7).All200Adeepwell,frontpositionedbushings.The catalog number would be: WA11-P702
Example 2:Load Break SwitchVaultstyle,25kV,singlephaseloadbreakswitchwithall200Adeepwellfrontpositionedbush-ings.The catalog number would be: VA21-PL02
200A
200A
200A
200A
p Submersible, subsurface installation permitting hookstick operation from above ground.
or
1.6"(41mm)
7.5"(191mm)
10.0"(254mm)
or
t Typical One-line
Typical One-line u
hoW to order - trident®-sp sinGle phase sWitchGear
Mounting
Configuration*
Voltage Class
Number of Phases
Description CodeBushingsfront;sidemountedhandle ABushingsback;sidemountedhandle C
Description Code
Trident-SPsinglephase P
Description Code
Loadbreakswitch L
Type1 1
Type3 3
Type4 4
Type7 7
Description Code
Nooptions 0
Auxiliarycontacts 1
Controls, if applicable
Switch Style
Options
kV Code15 125 2
Phase CodeSingle 1
* Contact your G&W representative for other configurations
Closest to Housing Away from Housing Code
200A 200A 2
200A 600A 3
600A 200A 4
600A 600A 6
Bushing Arrangement
hoW to order:Selectfromthevariouscatalogbreakdownchartoptionsbelow.Enterthedesiredselectioninthecorrespond-ingcatalognumberposition.
Description Code
Padmount,frontaccess,verticalmount P
Padmount,frontaccess,horizontalmount H
Padmount,front/backaccess,vertical B
Padmount,front/backaccess,horizontal R
Vaultstylewithnon-submersibleelectronics(ifsupplied) V
Vaultstylewithsubmersibleelectronics(ifsupplied) W
G&W control optionsType 1controlsoperatethree,singlephasevacuuminterruptingmechanisms.TheType1canbefieldsetforeithersinglephaseorthreephasetripmode.Itisusedonswitcheswitheithersinglephaseresetorthreephasereset.Wheninthethreephasemode,allthreephasestripiftheselectedtriplevelofanyindividualphaseisreached.Triplevelselectionscanbemadeunderloadorno-loadconditionswithcurrentrangesin12selectablelevels.Tworangesofminimumtripsettingsareavailable,15to300ampsand30to600amps.Eachunitispre-programmedwith30TimeCurrentCharacteristic(TCC)curves.Thecurveselectioncanbesetorchangedatanytime.
Type 2controlsofferfeaturessimilartoType1withthefollowingadditionalfeatures:-Threephaseprotectiononly-Minimumtripsetforallthree phaseswithoneselectorswitch-Adjustablephasetimedelay-Groundfault(phaseimbalance) withseparateadjustabletime delayselectorswitchforprotection oflargethreephasemotorsor transformers.Thegroundtrip levelisrepresentedasapercent oftheminimumtriplevel.-Instantaneoustripandinrush restraintfeatures
Type 3controlsofferfeaturessimilartoType2andmoreincluding:-Singlephaseorthreephasetrip-Vacuumfluorescentdisplay-Keypadoperationforprogramming parametersandretrievingstatus ofcurrentvalues-Adjustablephasetimedelay-Groundfaulttrip-Inrushrestraint-Phaseidentificationandmagnitude offaultindication-Readoutofreal-timecurrentvalues-Selectableinstantaneoustrip-Selectableminimumresponsetime-RS232orRS485serialinterface-Laptopprogrammingkitavailable
Type 4 controlsprovidethesamefeaturesasType3controls;however,thereisnokeypadpanel,displayscreen,ormanualtripbutton.Thecontrolisprogrammedusingalap-topcomputer.Alaptopprogrammingkitisavailable.
control options
p Type 1 control
p Type 2 control
p Type 3 control
p Type 4 control
Page21
control options
Type 7 controlsprovidethesamefeaturesasType4controls,exceptthatthecontrolsaremountedinternaltotheswitchmechanismhousing,eliminatingtheneedforaseparatecontrolenclosureandassociatedcabling.Thecontrolisprogrammedusingalaptopcomputer.Alaptopprogrammingkitisavailable.Singleandthreephaseversionsareavailable.
laptop proGramminG KitFor Type 3, Type 4 or Type 7 Providessoftwareandcableconnectiontoaportablelaptopcom-puterforprogrammingorretrievingfaultinterruptercontrolinformation.OnecableconnectstotheUSBportofthecomputerandtheothercon-nectstothecontrolbox(Type3or4)ormechanismhousing(Type7).
remote operation For trident-sMotor ActuatorsForspring-assistedswitches,motoractuatorsarerequiredforremoteoperation.Actuatorsareexternallymountedtoeachswitchoperator.Ifcontrolsarespecified,theactua-torsarehardwiredwith25feetofcable.Padmountdesignsmayhavecablescuttolengthtofitwithintheenclosure.Ifnocontrolisspecified,theactuatorissuppliedwithamalethreadedconnectorforusewithpor-tablecontrols.Actuatorsarehousedwithinapainted,stainlesssteelenclosuresuitableforsubmersibleapplications.
For trident-srTrident-SRswitchgearalreadyincorporatesaninternal,highspeedmagneticactuatorandisSCADAreadybydesign.Noexternalactua-torsrequiredforremoteoperation.Variouscontroloptionsareavail-able.
Hand Held ControlsAhandheldcontrolisidealforundergroundvaultapplicationspermittingswitchoperationfromaboveground.Thecontrolcableishardwiredintotheswitchandusesathreadedconnectorforattachmenttothecontrol.Thepolycarbonatecon-trolboxisapproximately7”Wx4”H.The24VDCcontrolispoweredbytheswitch.
Page23
p Hand held controls permit switch operation from outside the vault.
p Stationary controls permit either local or remote SCADA operation.
Plug and play construction-TheATC451ispre-programmedandpackagedwithallrequiredcomponentstosimplifyinstallationandmaximizereliableperformance.VariousstylesofNEMAenclosuresareavailabledependingontheapplication.
Overcurrent protection for up to two fault interrupting ways-TheATC451caneliminatetheneedforseparatevacuuminterruptercontrols.Dependingonuserpreferenceandsystemprotectionschemes,variousstylesofseparateinterruptercontrolsareavailable.
Bus tie configurations-TheATC451canbeusedwithabus-tieswitchpermittingautomatictransferwheretheloadisnormallybalancedbetweentwosources.
User friendly controls-Largepushbuttonsareclearlylabeledandprovideeasycontrolcommandsfromthefrontpanel.
Sequence of event recorder-EachATC451includesaSequenceofEventsRecorderwhichwillrecordthelast1000entries,includingset-tingchanges,powerups,andselect-ablelogicelements.
Flexible voltage sensing options -Integralvoltagesensingbushingsareavailablewhicheliminatetheneedforcumbersomeadd-ondevic-es.Thebushingsare600Arated,fullysubmersible,andprovideoneanalogoutputperphaseandonedigitaloutputperwayforvoltagemonitoring.Elbowmountedsensorsandpotentialtransformersarealsoavailable.
Central control-Thisconfigurationisidealforlargernetworkcircuitswhereadvancedcapabilitiesarerequired.ItiscontrolledbySCADAorDMSsoftwarethatoffersunparalleledmonitoringandcontrol.G&WusessoftwarefromSurvalentTechnologylikeSmartVU™.Thissoftwareoffersauser-friendlyinterfaceaswellastheadvancedcapabilitytohandleauto-maticloadflowadjustmentsandnet-workmanagement.
Protection and ControlAwidevarietyofprogrammablefeaturesareavailableforprotectionincludinguptoeightindependentsettinggroupswhichoffermultiplelayersofprotection.Advancedcom-municationassistedtrippingschemes,suchasPermissiveOverreachingTransferTrip(POTT)andDirectionalComparisonBlocking(DCB)canbeemployedtoofferextremelyhighspeedfaultisolationonclosedloopsystems.Thesetrippingschemescanbebackeduptomaintainprotectiononfailureofbreakersorcommunication.
a smart Grid componentASmartGridconsistsofallpointsinapowernetworkcommunicatingtoautomaticallymakedecisions.Thegoalistomaximizethereliabilityandefficiencyofthenetworkwhilegiv-ingindividualconsumerscontrolovertheirconsumption.SomeofthebasictechnologiesareSCADA,automaticreconfigurationandrestoration,AMR/AMI(meterreading)software,smartmeters,andrenewableenergyintegra-tion.
Ground cut in / cut out selector sWitchForfaultinterruptingswitchesincorporatinggroundfaultprotec-tion.Switchesaresuppliedwithanexternaloperatingleverwhich,whenoperated,disablesallgroundfaultprotectionwhilestillpermittingloadbreakswitching.Thispermitstheusertoperformemergencyswitch-ingtoreconfigureloadswithouttheworryofpossibleinadvertenttrippingcausedbytemporarycurrentimbal-anceswhichmightotherwisehappeniftheovercurrentcontrolswerestillactivated.Thisoptioneliminatestheneedforrelaytechnicianstotempo-rarilychangetheprotectionscheme.Theswitchleversarepadlockableandoperablebyhookstickorrope.
motor actuator Automationbeginswiththeaddi-tionofmotoractuatorstoamanualswitch.Theseactuatorscanbefac-toryinstalledfornewequipmentorretrofittedtoswitchgearinstalledinthefield.TheyarehousedinaNEMA6Penclosureforsubmersibleinstallations.
SHANGHAI G&W ELECTRIC LTD.No.8Lane1505,ZuChongZhiRoad,ZhangJiang,Pudong,Shanghai,China201210+86-21-5895-8648,Fax:+86-21-5895-6829,Website:www.gwelec.com.cn