雙側(cè)電源線(xiàn)路三相自動(dòng)重合閘 Three-phase Aut

雙側(cè)電源線(xiàn)路三相自動(dòng)重合閘

Three-phaseAutomaticReclosingofBilateral-powerLines繼電保護(hù)運(yùn)行與調(diào)試

RelayProtectionOperationandCommissioning讓我們帶著問(wèn)題開(kāi)始……

Let'sstartwithquestions......1、雙側(cè)電源線(xiàn)路三相自動(dòng)重合閘應(yīng)考慮哪些問(wèn)題？

1.Whatshouldbeconsideredforthree-phaseautomaticreclosingofbilateralpowerlines?2、雙側(cè)電源線(xiàn)路三相自動(dòng)重合閘有哪些類(lèi)型？

2.Whatarethetypesofthree-phaseautomaticreclosingofbilateralpowerlines?3、三相快速自動(dòng)重合閘的應(yīng)用條件有哪些？

3.Whataretheapplicationconditionsofthree-phasefastautomaticreclosing?4、非同步自動(dòng)重合閘有哪兩種工作方式？

4.Whatarethetwomodesofoperationfornon-synchronousautomaticreclosing?5、無(wú)電壓檢定和同步檢定自動(dòng)重合閘工作原理是什么？啟動(dòng)回路接線(xiàn)中，連接片XB接通和斷開(kāi)的含義是什么？同步檢定繼電器KSY工作原理是什么？

5.Whatistheworkingprincipleofnon-voltageverificationandsynchronousverificationautomaticreclosing?WhatisthemeaningoftheconnectingpieceXBconnectionanddisconnectioninthestartcircuitwiring?WhatistheworkingprincipleofthesynchronousverificationrelayKSY?6、在一些特定條件下采用不經(jīng)同步檢定的特殊重合閘方式有哪些？工作原理是什么？

6.Whatarethespecialreclosingmodesthatareusedwithoutsynchronousverificationundersomespecificconditions?Whatistheprincipleofwork?1.雙側(cè)電源線(xiàn)路自動(dòng)重合閘

1.AutomaticReclosingofBilateralPowerLines只有一個(gè)電源——可采用單側(cè)電源自動(dòng)重合閘。

Thereisonlyonepowersupply-unilateralpowerautomaticreclosingcanbeused.線(xiàn)路兩側(cè)均有電源——除滿(mǎn)足前述自動(dòng)重合閘基本要求外，還應(yīng)考慮：

Thereispoweronbothsidesoftheline-inadditiontomeetingthebasicrequirementsforautomaticreclosingasdescribedabove,considerationshouldbegivento:故障點(diǎn)的斷電時(shí)間問(wèn)題

Thepower-offtimeatthepointoffailure同步問(wèn)題

Synchronization先跳閘一側(cè)的斷路器在進(jìn)行重合閘時(shí)，應(yīng)在故障點(diǎn)有足夠斷電時(shí)間的情況下進(jìn)行，即兩側(cè)QF均跳開(kāi)0.5～1.5s再進(jìn)行重合

Thecircuitbreakeronthesidethattripsfirstshouldbereclosedwhenthepointoffaulthasenoughdisconnectiontime,i.e.,bothsidesoftheQFaretrippedfor0.5~1.5sbeforereclosing.后合閘一側(cè)的斷路器在進(jìn)行重合閘時(shí)，必須保證兩電源間的同步條件，或校驗(yàn)是否允許非同步重合閘。

Whenthecircuitbreakeronthelate-closingsidearebeingreclosed,itisnecessarytoensurethesynchronizationconditionsbetweenthetwopowersuppliesortocalibratewhethernonsynchronousreclosingisallowed.1.雙側(cè)電源線(xiàn)路自動(dòng)重合閘

1.AutomaticReclosingofBilateralPowerLines雙側(cè)電源線(xiàn)路ARD

BilateralpowerlinesARD三相快速ARD

Three-phasefastARD非同步ARD

Non-synchronousARD無(wú)壓檢定和同步檢定ARD

No-voltageverificationandsynchronousverificationARDs檢查平行線(xiàn)路有電流的ARD

ARDwithcurrentinparallelcircuit解列ARD

DesynchronizedARD自同步ARD

Self-synchronizationARD2.三相快速自動(dòng)重合閘

2.Three-phasefastautomaticreclosing在合閘瞬間，兩側(cè)電源很可能不同步，但因重合時(shí)間短，重合后系統(tǒng)也會(huì)很快拉入同步。

Intheinstantofclosing,thepowersuppliesonbothsidesarelikelytobeunsynchronized,butbecauseoftheshortreclosingtime,thesystemwillsoonbesynchronizedafterreclosing.可見(jiàn)，快速重合成功可提高系統(tǒng)并列運(yùn)行的穩(wěn)定性和供電可靠性。

Itcanbeseenthatthesuccessfulfastreclosingcanimprovethestabilityofparalleloperationofthesystemandthereliabilityofpowersupply.三相快速ARD是指，在線(xiàn)路發(fā)生故障時(shí)，兩側(cè)保護(hù)瞬時(shí)將故障切除后，不管兩側(cè)電源是否同步，就可進(jìn)行重合，經(jīng)0.5~1s延時(shí)后，兩側(cè)斷路器都重新合上。

Three-phasefastARDrefersto:whenthelinefails,aftertheprotectiononbothsidesisolatesthefaultinstantaneously,regardlessofwhetherthepowersupplyonbothsidesissynchronized,thecircuitbreakersonbothsidescanbereclosedafter0.5~1sdelay.2.三相快速自動(dòng)重合閘

2.Three-phasefastautomaticreclosing采用三相快速自動(dòng)重合閘應(yīng)具有如下條件：

However,theuseofthree-phasefastautomaticreclosingshouldhavethefollowingconditions:01

01線(xiàn)路兩側(cè)都裝設(shè)有能瞬時(shí)切除全線(xiàn)故障的繼電保護(hù)裝置（全線(xiàn)速動(dòng)保護(hù)），如高頻保護(hù)。

Bothsidesofthelineareequippedwithrelayprotectiondevicescapableofinstantaneouslyremovingfaultsonthewholeline(line-widefast-actingprotection),e.g.high-frequencyprotection.02

02線(xiàn)路兩側(cè)裝有可以進(jìn)行快速重合閘的斷路器，如快速空氣斷路器。

Bothsidesofthelineareequippedwithfastreclosingcircuitbreakers,suchasfastaircircuitbreakers.03

03在兩側(cè)斷路器非同步重新合閘瞬間，輸電線(xiàn)路上出現(xiàn)的沖擊電流，不能超過(guò)電力系統(tǒng)各元件的沖擊電流的允許值。

Atthemomentofasynchronousreclosingofcircuitbreakersonbothsides,theinrushcurrentappliedonthetransmissionlinemustnotexceedthepermissiblevalueoftheinrushcurrentofeachcomponentofthepowersystem.保證從線(xiàn)路短路開(kāi)始到重新合閘的整個(gè)時(shí)間間隔在0.5~0.6s以?xún)?nèi)，在這樣短時(shí)間內(nèi)，兩側(cè)電源電動(dòng)勢(shì)之間夾角擺開(kāi)不大，系統(tǒng)不會(huì)失去同步。

Thisensuresthattheentiretimeintervalfromthestartofthelineshortcircuittothereclosingofthecircuitbreakeriswithin0.5-0.6s.Insuchashortperiodoftime,theangleswingbetweenthetwosidesofthepowersupplyelectromotiveforceisnotlarge,sothesystemdoesnotlosesynchronization.220KV及以上線(xiàn)路，是提高系統(tǒng)并列運(yùn)行穩(wěn)定性和供電可靠性的有效措施。

220KVandabovelinesareeffectivemeasurestoimprovethestabilityofparalleloperationofthesystemandthereliabilityofpowersupply.適用場(chǎng)合

Applicableoccasions3.非同步自動(dòng)重合閘

3.Nonsynchronousautomaticreclosing非同步ARD就是輸電線(xiàn)路兩側(cè)斷路器跳閘后，不考慮系統(tǒng)是否同步而進(jìn)行自動(dòng)重合。

NonsynchronousARDreferstotheautomaticreclosingafterthecircuitbreakersonbothsidesofthetransmissionlinetripwithoutconsideringwhetherthesystemissynchronized.顯然，重合時(shí)電氣設(shè)備可能要受到電流沖擊以及系統(tǒng)出現(xiàn)振蕩的情況，因而采用非同步自動(dòng)重合閘具有一定的條件。

Obviously,theelectricalequipmentmaybeaffectedbytheimpactofcurrentandthesystemoscillationwhenreclosing,sotheuseofnonsynchronousautomaticreclosingissubjectedtocertainconditions.當(dāng)不具備快速切除全線(xiàn)路故障和快速動(dòng)作的斷路器條件時(shí)，可以考慮采用非同步自動(dòng)重合閘。

Nonsynchronousautomaticreclosingcanbeconsideredwhenthecircuitbreakerconditionsforquickisolationoffull-linefaultsandfastoperationarenotavailable.3.非同步自動(dòng)重合閘

3.Nonsynchronousautomaticreclosing采用非同步自動(dòng)重合閘應(yīng)具有如下條件：

Theuseofnon-synchronousautomaticreclosingshouldmeetthefollowingconditions:01

01從電氣設(shè)備安全角度考慮，進(jìn)行非同步ARD時(shí)同步電機(jī)的電磁轉(zhuǎn)矩不得超過(guò)發(fā)電機(jī)出口三相突然短路所產(chǎn)生的電磁轉(zhuǎn)矩；流過(guò)同步發(fā)電機(jī)、同步調(diào)相機(jī)或電力變壓器的沖擊電流不得超過(guò)允許值，如無(wú)專(zhuān)門(mén)規(guī)定時(shí)，沖擊電流的允許值同三相快速ARD時(shí)的規(guī)定值相同，不過(guò)在計(jì)算沖擊電流時(shí)兩側(cè)電勢(shì)間夾角取180°。

Inviewofthesafetyoftheelectricalequipment,theelectromagnetictorqueofthesynchronousmotorshouldnotexceedtheelectromagnetictorquegeneratedbythesuddenshortcircuitofthethree-phaseoutletofthegeneratorduringthenonsynchronousARD.Theimpulsecurrentflowingthroughthesynchronousgenerator,synchronousregulatororpowertransformershallnotexceedtheallowablevalue;unlessotherwisespecified,theallowablevalueoftheimpulsecurrentisthesameasthespecifiedvalueforthethree-phasefastautomaticreclosing,buttheincludedanglebetweenthetwosidesoftheimpulsecurrentis180o.02

02從負(fù)荷角度考慮，在非同步ARD所產(chǎn)生的振蕩過(guò)程中，應(yīng)采取相應(yīng)措施減小對(duì)重要負(fù)荷的影響。

對(duì)于重合后經(jīng)歷較長(zhǎng)時(shí)間的異步運(yùn)行而后拉入同步或根本不能恢復(fù)同步運(yùn)行的狀況，必將甩去大量負(fù)荷，因而不能采用非同步ARD。

Consideringfromtheloadpointofview,thecorrespondingmeasuresshouldbetakentoreducetheinfluenceontheimportantloadduringtheoscillationprocesscausedbynonsynchronousARD.Forthesituationthatsynchronousoperationisrequiredafterlong-timeasynchronousoperationorsynchronousoperationcannotberecoveredatall,alotofloadwillbediscarded,andthereforenonsynchronousARDcannotbeused.3.非同步自動(dòng)重合閘

3.Nonsynchronousautomaticreclosing兩側(cè)均采用單電源線(xiàn)路重合閘接線(xiàn)

Singlepowerlinereclosingwiringonbothsides優(yōu)點(diǎn)：接線(xiàn)簡(jiǎn)單，不需裝設(shè)線(xiàn)路電壓互感器，系統(tǒng)恢復(fù)并列運(yùn)行快，提高供電可靠性。

Advantage:simpleconnectionwithoutlinevoltagetransformers,quickrecoveryofparalleloperationofthesystem,andimprovedreliabilityofpowersupply.缺點(diǎn)：永久性故障情況下線(xiàn)路兩側(cè)均要重合一次。

Disadvantage:bothsidesofthelineshouldbereclosedonceincaseofpermanentfault.預(yù)先規(guī)定兩側(cè)斷路器的合閘順序，先重合側(cè)采用單電源線(xiàn)路重合閘接線(xiàn)，后重合側(cè)檢定線(xiàn)路有電壓后才重合。

Theclosingorderofthecircuitbreakersonbothsidesisspecifiedinadvance,andthereclosingconnectionofthesinglepowerlineisadoptedontheearly-reclosedside,andthelate-reclosedsideisclosedaftervoltageisdetectedontheline.優(yōu)點(diǎn)：永久性故障時(shí)后重合側(cè)不會(huì)重合，免除再一次給系統(tǒng)造成沖擊。

Advantage:thelate-reclosedsidewillnotbeclosedinthecaseofapermanentfault,avoidingtheimpactonthesystemagain.缺點(diǎn)：1）后重合側(cè)一定要在線(xiàn)路有電壓（即先重合側(cè)斷路器已合上）才進(jìn)行重合，因而整個(gè)重合閘時(shí)間較長(zhǎng)，線(xiàn)路恢復(fù)供電時(shí)間也較長(zhǎng)；2）在線(xiàn)路側(cè)必須裝設(shè)電壓互感器或電壓抽取裝置，增加了設(shè)備投資。

Disadvantage:1)thelate-reclosedsidemustbereclosedunderthevoltageoftheline(thatis,thecircuitbreakerontheearly-reclosedsidehasbeenclosed),sothewholereclosingtimeislonger,andthepowersupplyrecoverytimeofthelineislonger;2)thevoltagetransformerorvoltageextractiondevicemustbeinstalledonthesideoftheline,whichincreasestheequipmentinvestment01不按順序投入線(xiàn)路兩側(cè)斷路器

01Nosequentialinputofcircuitbreakersonbothsidesoftheline02按順序投入線(xiàn)路兩側(cè)斷路器

02Sequentialinputofcircuitbreakersonbothsidesoftheline4.無(wú)電壓檢定和同步檢定的三相自動(dòng)重合閘

4.Three-phaseautomaticreclosingforno-voltageverificationandsynchronousverification檢無(wú)壓和檢同步ARD是指當(dāng)線(xiàn)路兩側(cè)斷路器跳開(kāi)后，其中一側(cè)（稱(chēng)為無(wú)壓側(cè)）先檢定線(xiàn)路無(wú)電壓而重合，后重合側(cè)（稱(chēng)為同步側(cè)）檢定線(xiàn)路兩側(cè)電源滿(mǎn)足同步條件后再進(jìn)行重合。

No-voltageverificationandsynchronousverificationARDmeansthatwhenthecircuitbreakersonbothsidesofthelinetrip,oneoftheside(knownastheno-voltageside)willbereclosedaftercheckingandconfirmingthelineisfreeofvoltage,andthelate-reclosedside(knownasthesynchronizationside)willbereclosedaftercheckingandconfirmingthepowersupplyonbothsidesofthelinemeetsthesynchronizationcondition.顯然，這種重合閘方式不會(huì)產(chǎn)生危及設(shè)備安全的沖擊電流，也不會(huì)引起系統(tǒng)振蕩，重合后能很快進(jìn)入同步運(yùn)行狀態(tài)。

Obviously,thistypeofreclosingwillnotproduceinrushcurrentthatendangersthesafetyoftheequipment,andwillnotcausesystemoscillation,andafterreclosing,itcanquicklyenterthesynchronousoperationstate.在沒(méi)有條件或不允許采用三相快速重合閘、非同步重合閘的雙電源單回線(xiàn)路或弱聯(lián)系的環(huán)并線(xiàn)上，可考慮采用無(wú)電壓檢定和同步檢定的三相自動(dòng)重合閘。

Three-phaseautomaticreclosingforno-voltageverificationandsynchronousverificationcanbeadoptedonthebilateral-powersingle-circuitlineortheweakly-connectedloopparallellinewherethree-phasefastreclosingornonsynchronousreclosingisnotallowed.4.1工作原理

4.1Principleofwork線(xiàn)路MN兩側(cè)各裝一套帶同步檢定繼電器KSY和低電壓繼電器KV的ARD裝置。

AsetofARDdevicewithsynchronousverificationrelayKSYandlowvoltagerelayKVisinstalledoneachsideoflineMN.無(wú)壓側(cè)（M側(cè)）的無(wú)壓、同步連接片投入，同步側(cè)（N側(cè)）僅投入同步連接片。

Theno-voltageandsynchronizationconnectingstrapsareengagedontheno-voltageside(Mside),andonlythesynchronizationconnectingstrapisengagedonthesynchronizationside(Nside).無(wú)壓

Pressureless同步

Synchronous無(wú)壓

Pressureless同步

Synchronous圖2-60無(wú)電壓檢定和同步檢定的三相自動(dòng)重合閘示意圖

Figure2--60Schematicdiagramofthree-phaseautomaticreclosingforno-voltageverificationandsynchronousverification4.1工作原理

4.1Principleofwork線(xiàn)路跳閘→線(xiàn)路無(wú)電壓→兩側(cè)的KSY不工作→常閉觸點(diǎn)打開(kāi)（為什么？）

Linetripping→novoltageontheline→KSYonbothsidesdoesnotoperate→normallyclosedcontactsopen(why?)無(wú)壓側(cè)：M側(cè)低電壓繼電器KV檢定無(wú)壓而動(dòng)作→觸點(diǎn)閉合→經(jīng)連接片啟動(dòng)ARD→經(jīng)預(yù)定時(shí)間→QFM合閘。

No-voltageside:M-sidelowvoltagerelayKVoperatesaftercheckingthatthereisnovoltage→thecontactisclosed→operateARDviatheconnectionpiece→apredeterminedtimegoesby→QFMisclosed.同步側(cè)：QFM合閘→N側(cè)線(xiàn)路有電壓→N側(cè)KSY開(kāi)始工作→兩側(cè)電壓滿(mǎn)足同步→KSY常閉觸點(diǎn)閉合時(shí)間足夠長(zhǎng)（等于或大于圖2-59中KT1的延時(shí)）→啟動(dòng)ARD→QFN合閘。

Synchronizationside:QFMisclosed→linevoltageonNside→KSYonNsidestartstowork→voltageonbothsidesissynchronous→KSYnormallyclosedcontactclosesforalongenoughtime(equaltoorgreaterthanthedelaytimeofKT1inFigure2--59)→startARD→QFNisclosed.線(xiàn)路發(fā)生瞬時(shí)性故障時(shí)

Whenatransientfaultoccursontheline4.1工作原理

4.1PrincipleofworkM側(cè)重合后，由無(wú)壓側(cè)后加速保護(hù)裝置動(dòng)作跳閘，同步側(cè)斷路器始終不能重合。

AfterM-sideisreclosed,itistrippedbytheoperationofthepost-accelerationprotectiondeviceattheno-voltageside,andthesynchronoussidecircuitbreakercanneverbereclosed.線(xiàn)路發(fā)生永久性故障時(shí)

Whenapermanentfaultoccursontheline同步側(cè)誤跳：由KSY檢定同步后，使N側(cè)斷路器重合。

Synchronoussidefalsetrip:AftercheckingthesynchronizationbyKSY,theN-sidecircuitbreakerisreclosed.無(wú)壓側(cè)誤跳：因線(xiàn)路有電壓，KV常閉觸點(diǎn)打開(kāi)，不能由KV觸點(diǎn)去啟動(dòng)ARD，為此無(wú)壓側(cè)增設(shè)KSY，便可將M側(cè)斷路器重新合上。

Non-voltagesidefalsetrip:Becauseoflinevoltage,KVnormallyclosedcontactopens,andARDcannotbeactivatedbyKVcontact.Forthisreason,KSYisprovidedonthenon-voltageside,andthentheM-sidecircuitbreakercanbereclosed.正常運(yùn)行情況下，因誤碰或保護(hù)誤動(dòng)作造成斷路器誤跳閘時(shí)

Undernormaloperation,whenthecircuitbreakeristrippedbymistakeduetowrongtouchingorprotectionmalfunctioning4.1工作原理

4.1Principleofwork為使兩側(cè)斷路器的工作條件接近相同，在兩側(cè)均裝設(shè)KSY和KV，利用連接片定期輪換其工作方式。

Inordertomaketheworkingconditionsofthecircuitbreakersonbothsidesclosetothesame,KSYandKVareinstalledonbothsides,andtheconnectionpieceisutilizedtorotateitsworkingmodeperiodically.無(wú)壓側(cè)斷路器重合到永久性故障時(shí)，將連續(xù)兩次切斷短路電流，其工作條件比同步側(cè)惡劣。

Whenthenon-voltagesidecircuitbreakerisrelcosedwithapermanentfault,itwillcutofftheshortcircuitcurrenttwiceinarow,anditsworkingconditionisworsethanthatofthesynchronizationside.同步側(cè)的無(wú)電壓檢定不能投入工作，即同步側(cè)的無(wú)壓連接片XB是斷開(kāi)的，否則可能會(huì)造成非同步重合閘，導(dǎo)致系統(tǒng)穩(wěn)定被破壞或電氣設(shè)備損壞的嚴(yán)重后果。

Thenon-voltagecheckonthesynchronizationsidecannotbeconducted,i.e.,theno-voltageconnectionpieceXBonthesynchronizationsideisdisconnected;otherwiseitmayresultinnonsynchronousreclosing,whichmayleadtoseriousconsequencessuchasthesystemstabilitybeingdisruptedorthedamagetoelectricalequipment.若兩側(cè)無(wú)壓連接片都斷開(kāi)，會(huì)造成故障后重合閘拒動(dòng)。

Ifbothsidesoftheno-voltageconnectionstraparedisconnected,itwillcausereclosingrefusalafterafault.4.2接線(xiàn)的實(shí)現(xiàn)

4.2Connectionrealization同步側(cè)和無(wú)壓側(cè)均需設(shè)置檢定線(xiàn)路無(wú)電壓的繼電器KV和檢定同步的繼電器KSY，只是同步側(cè)的KV不能啟動(dòng)重合閘。與圖2-59單電源線(xiàn)路重合閘的接線(xiàn)相比，僅是重合閘啟動(dòng)回路的不同。

Boththesynchronizationsideandthenon-voltagesiderequiretherelayKVfortestingnon-voltageofthelineandtherelayKSYfortestingthesynchronization,exceptthatKVonthesynchronizationsidecannotstartthereclosing.Comparedwiththeconnectionofthesingle-powerlinereclosingdeviceinFigure2--59,onlythereclosingdevicestartingcircuitisdifferent.KV2觸點(diǎn)構(gòu)成檢定無(wú)電壓?jiǎn)?dòng)重合閘回路

KV2contactconstitutesthenon-voltagestartingreclosingcircuit.注意：無(wú)壓側(cè)連接片XB應(yīng)接通，同步側(cè)XB應(yīng)斷開(kāi)。

Note:TheconnectionpieceXBonthenon-voltagesideshouldbeconnectedandXBonthesynchronizationsideshouldbedisconnected.KV1、KSY觸點(diǎn)構(gòu)成檢定同步啟動(dòng)重合閘回路

KV1andKSYcontactsconstitutethestartingreclosingcircuitforsynchronousverification.線(xiàn)路側(cè)TV

LinesideTV母線(xiàn)側(cè)TV

Busbar-sideTV圖2-61無(wú)電壓檢定和同步檢定的重合閘啟動(dòng)回路

Figure2--61Reclosingstartingcircuitforno-voltageverificationandsynchronousverification4.3DT-13型同步檢定繼電器KSY工作原理

4.3PrincipleofworkofDT-13synchronousverificationrelay

(a)結(jié)構(gòu)

(a)Structure(b)電壓相量

(b)Voltagephasors

4.3DT-13型同步檢定繼電器KSY工作原理

4.3PrincipleofworkofDT-13synchronousverificationrelay

5.在一些特定條件下采用不經(jīng)同步檢定的特殊重合閘方式

5.Specialreclosingmodewithoutsynchronousverificationisusedundersomespecificconditions01檢定另一回線(xiàn)路有電流的自動(dòng)重合閘

01Automaticreclosingfortestingcurrentontheothercircuit02解列自動(dòng)重合閘

02Desynchronizedautomaticreclosing03自同步重合閘

03Self-synchronizationreclosing5.1檢定另一回線(xiàn)路有電流的自動(dòng)重合閘

5.1Automaticreclosingfortestingcurrentontheothercircuit一回線(xiàn)路跳閘斷開(kāi)后，另一回線(xiàn)路通過(guò)最小負(fù)荷電流時(shí)，電流繼電器KA應(yīng)有足夠的靈敏度，其動(dòng)作電流可按僅一回線(xiàn)路運(yùn)行時(shí)KA的返回電流應(yīng)大于另一回線(xiàn)路的電容電流來(lái)整定。

Afteronecircuitisdisconnectedduetotrip,whentheothercircuitissubjectedtotheminimumloadcurrent,thecurrentrelayKAshouldhavesufficientsensitivity,anditsoperationcurrentcanbesetaccordingtotheconditionthat,whenonlyonecircuitisrunning,thereturningcurrentofKAshouldbegreaterthanthecapacitancecurrentoftheothercircuit.在沒(méi)有其它旁路聯(lián)系的雙電源平行雙回線(xiàn)路上，在一回線(xiàn)因故障斷開(kāi)后，只要另一回線(xiàn)路不斷開(kāi)，兩側(cè)電源一般不會(huì)失去同步。

Onaparalleldual-circuitlinewithnootherbypassconnection,afteronelineisdisconnectedduetoafault,thepowersuppliesatbothsidesdonotlosesynchronizationaslongastheotherlineremainsconnected.只要檢定另一回線(xiàn)路有電流就相當(dāng)于檢定了兩側(cè)電源同步，從而可進(jìn)行重合閘。

Thecurrenttestonanotherlineisequivalenttothetestofthepowersupplysynchronizationbothsides,sothatreclosingcanbecarriedout.采用這種重合閘方式的優(yōu)點(diǎn)是電流檢定比同步檢定簡(jiǎn)單。

Theadvantageofusingthisreclosingmethodisthatthecurrenttestissimplerthanthesynchronousverification.圖2-63雙回線(xiàn)路中檢定另--回線(xiàn)路有電流的重合閘示意圖

Figure2--63Schematicdiagramofreclosingforcheckingthecurrentoftheothercircuitindual-circuitline5.2解列自動(dòng)重合閘

5.2Desynchronizedautomaticreclosing解列后，小電源的容量基本與所帶重要負(fù)荷平衡，這樣就保證對(duì)地區(qū)重要負(fù)荷的連續(xù)供電。斷路器QF1、QF3斷開(kāi)后，系統(tǒng)側(cè)檢定線(xiàn)路無(wú)電壓而重合，如重合成功，則由系統(tǒng)恢復(fù)對(duì)小電源的不重要負(fù)荷的供電，而后在解列點(diǎn)進(jìn)行同步并列，恢復(fù)同步運(yùn)行。如重合不成功，則系統(tǒng)側(cè)保護(hù)再次動(dòng)作跳閘，中斷地區(qū)不重要負(fù)荷的供電。

Afterbeingdesynchronized,thecapacityofthesmallpowersupplyisbasicallybalancedwiththeimportantloadsitcarries,sothatcontinuouspowersupplytotheimportantloadsintheareaisguaranteed.AftercircuitbreakersQF1andQF3aredisconnected,thesystemsidechecksthatthelinehasnovoltageandrecloses;ifthereclosingissuccessful,thesystemrestorespowersupplytotheunimportantloadsofthesmallpowersource,andthencarriesoutsynchronousparallelismatthedesynchronizedpointandresumessynchronousoperation.Ifthereclosingisunsuccessful,thesystem-sideprotectionwilloperateagainandtrip,interruptingthepowersupplyofunimportantloadsinthearea.在雙側(cè)電源的單回線(xiàn)路上，當(dāng)不能采用非同步重合閘時(shí)，有時(shí)可采用解列自動(dòng)重合閘。

Onthebilateral-powersingle-circuitlines,whenasynchronousreclosingisimpossible,thedesynchronizedautomaticreclosingcanbeadoptedsometimes.正常運(yùn)行時(shí)，由系統(tǒng)向小電源側(cè)輸送功率。當(dāng)線(xiàn)路發(fā)生故障時(shí)，系統(tǒng)側(cè)保護(hù)動(dòng)作，跳開(kāi)斷路器QF1；小電源側(cè)保護(hù)動(dòng)作使解列點(diǎn)斷路器QF3跳閘，而不跳線(xiàn)路斷路器QF2。

Duringnormaloperation,powerisdeliveredfromthesystemtothesmallpowersupplyside.Whenafaultoccursontheline,thesystem-sideprotectionoperatestotripthecircuitbreakerQF1;theprotectionoperatesonthesmallpowersupplysidetotripthedesynchronizedpointcircuitbreakerQF3withouttrippingthelinecircuitbreakerQF2.系統(tǒng)

System非重要負(fù)荷

Non-criticalload解列點(diǎn)

Disconnectionpoint小電源

Minorpowersources重要負(fù)荷

Criticalload圖2-64雙電源單回線(xiàn)路上采用解列重合閘示意圖

Figure2--64Schematicdiagramofdesynchronizedautomaticreclosingadoptedforthebilateral-powersingle-circuitlines5.3自同步重合閘

5.3Self-synchronizationreclosing采用自同步重合閘時(shí)，必須考慮對(duì)水電站側(cè)地區(qū)負(fù)荷供電的影響。如果水電站有地區(qū)負(fù)荷，并有兩臺(tái)以上的機(jī)組時(shí)，則應(yīng)考慮使一部分機(jī)組與系統(tǒng)解列，繼續(xù)向地區(qū)負(fù)荷供電，另一部分機(jī)組實(shí)行自同步重合閘。

Whenself-synchronizationreclosingisused,theeffectonthesupplyofarealoadsonthesideofthehydroelectricpowerstationmustbeconsidered.Ifthehydroelectricpowerstationhasarealoads,andtherearemorethantwounits,oneormoreoftheunitsshallbedesynchronizedwi