分析教案讲稿1acfc

MODIFICATIONS/REVISIONRECORDS

REV

Date

Modifydescription

A

2010.02.08

FIRSTISSUE

OPERATINGPARAMETERS

NORMALOPERATION

Theinverterisconnectedtothe220VACswitchboardsandfeedstheload.

Theoutgoingcircuit-breakersareclosedonthe220VACswitchboardaccordingtocustomers’need.

PARTICULARSTEADYOPERATION

DEFINITION

Thefollowingsituationsareconsideredasparticularoperations:

Inverteroff,

0LNMswitchboardoutofservice,

Regulatingtransformeroutofservice.

OPERATION

Inverteroff:

Theloadisdbythevoltageregulatingtransformer.

However,the220VACsystemisdbythe380Vpowernetwork,itisnolongerguaranteedwithoutbreaks,inparticularifasourcechangeoveroccurs.

0LNMswitchboardoutofservice:

Theinverterandthevoltageregulatingtransformerareoff.Voltageregulatingtransformeroutofservice:

Theinverterisdesynchronizedfromthenetworkandworkingatitsratedfrequencyifitisavailable,otherwise,thesystemisnotuninterrupted,ifinverterisnotavailable,thesystemislossof

power.

PARTICULARTRANSIENTOPERATION

Particulartransientoperationwillappearinthefollowingconditions:

380VACunder-voltage,

Earthfault,

Inverter-voltageregulatingtransformerswitchingover,

Inverterinternalfault,

Lossofloadontheinverter

Shortcircuit.

380VACUNDERVOLTAGE

Thisisonlythecasetakenintoaccountwheninverterisoffserviceandvoltageregulatingtransformerworkstogivepowersupplytoconsumers.If380VACpowernetworkisunder-voltageinthisparticularsituation,contact-controllooparepowercutbytripcontactsandbreakersremainatwhatstatustheywere.

EARTHFAULT

Whenonepoleisearthed,servicewouldnotbeinterruptedbecauselivelineandzerolineofACbusbararenon-earthed.Troubleshootingisthenmanualfixedandthefaultmustbecleared.(由于交流母线火线、零线均不接地，当仅有一个单极接地故障时，供电不会中断，但此时应尽快手动排除故障。)

INVERTER-VOLTAGEREGULATINGTRANSFORMERSWITCHINGOVER

InverterswitchesovertoVoltageRegulatingTransformerThisswitchingoveroccursinthefollowingconditions:

DC inglow-voltage

Inverterfault

Overload

Theswitchoverisautomatic.Ittakeslessthan2msandhasnoeffectonoperationoftheunit.

VoltageRegulatingTransformerswitchesovertoInverter

Theloadisautomaticallyreturnedtotheinverterassoonasbatteryvoltagerecoveredortroubleshootingisfixed.Theswitchovertimeofreturningtotheinverterislessthan2ms.

INVERTERINTERNALFAULT

Wheninverterinternalfaultoccurs,theloadisswitchedfrominvertertovoltageregulatingtransformer.Thefaultyapparatusisisolatedbyinverteroutgoingisolator.

Themanualbypassenablesmaintenanceandservice neltoperformworkontheinverterwithoutswitchingofftheloadcircuit.

LOSSOFLOADONTHEINVERTER

Iftheinverterlosesitsload,thisabnormityissignaledinthecontrolroomandactionisrequired.However,the220VACpowersupplyisensuredbythevoltageregulatingtransformerthroughmanualbypassswitch.

SHORT-CIRCUIT

220VAC

Theselectivityoftheprotectionsystemsisensuredasfollows:

Feedershort-circuit:

.Instantaneoustripofthecorrespondingoutgoingcircuit-breaker,

Short-circuitonthebusbars:

.Inverterinservice:

.Internalprotectivecircuitofinvertercontrolautomaticallyswitchingtovoltageregulatingtransformerwithstaticswitch.

.Voltageregulatingtransformerinservice:

.Trips ingcircuit-breakeronthevoltageregulatingtransformerprimarywinding

-Short-circuitontheinverteroutput:

.Internalprotectivecircuitofinvertercontrolautomaticallyswitchingtobypasswithstaticswitch,andshutdown.

Short-circuitonthevoltageregulatingtransformeroutput:

.Trips ingcircuit-breakeronthevoltageregulatingtransformerprimarywinding.

380VAC

Short-circuitonthevoltageregulatingtransformerpowersupply:

The380Voutgoingcircuit-breakertripsinstantaneously. Thevoltageregulatingtransformerisoutofservice.

STARTUPANDNORMALSHUTDOWN

Notapplicable.

OTHEROPERATIONS

Theseareeitheraccidentalorexceptionaloperatingmodes:

Permanentshort-circuitonbusbars,

Definitivelossof380VACvoltage.

PERMANENTSHORTCIRCUITONTHEBUSBARSDC:

Switchboard0LBOisoutofservice.AC:

Switchboard0LNMisoutofservice.

5.5.5. DEFINITIVELOSSOFTHE380VAC

Systemisnolonger220VACpowersupplyuninterruptedguaranteed.

CONTROLPRINCIPLES

Innormalcase,inverterisrunningwhilevoltageregulatingtransformerisrunninginst