發(fā)電機保護Powergeneratorprotection情境二：發(fā)電機相間短路的縱聯(lián)差動保護ScenarioII:LongitudinalDifferentialProtectionforInterphaseShortCircuitofPowerGenerator作用Function反映發(fā)電機定子繞組及其引出線相間短路故障的主保護Reflectthemainprotectionfortheinterphaseshortcircuitfaultofstatorwindingofpowergeneratorandthelead-outwire目錄頁CONTENTSPAGE發(fā)電機縱差保護的接線方式01Connectionmodeofgeneratorlongitudinaldifferentialprotection發(fā)電機縱差保護的原理02Principlesofgeneratorlongitudinaldifferentialprotection發(fā)電機縱差保護的接線方式Connectionmodeofgeneratorlongitudinaldifferentialprotection01發(fā)電機縱差保護的接線方式0102完全縱差動保護不完全縱差動保護ConnectionmodeofgeneratorlongitudinaldifferentialprotectionFullydifferentialprotectionNon-fullydifferentialprotection01發(fā)電機完全縱差動保護Generatorfullydifferentialprotection圖9—1G發(fā)電機縱差保護原理接線示意圖PrinciplesofgeneratorlongitudinaldifferentialprotectionConnectionschematicdiagram02發(fā)電機不完全縱差動保護Generatorincompletedifferentialprotection（a）中性點側(cè)引出6個端子(a)6lead-outterminalsattheneutralpointside

（b）中性點側(cè)引出4個端子(b)4lead-outterminalsattheneutralpointside

分析可見Analysisfindings發(fā)電機完全縱差保護和不完全縱差保護均是比較發(fā)電機兩側(cè)同相電流的大小和相位而構(gòu)成不同之處Difference完全縱差保護是比較每相定子首末兩端的全相電流。不完全縱差動保護是比較機端每相定子全相電流和中性點側(cè)每相定子的部分相電流而構(gòu)成。Fullyandnon-fullydifferentialprotectionsbothrequirecomparingthemagnitudeandphasepositionofpowergeneratorcurrentofthesamephaseonbothsidesFullydifferentialprotectionrequirescomparingfull-phasecurrentattheheadandtailendsofstatorofeachphase.Non-fullydifferentialprotectionrequirescomparingthefull-phasecurrentofstatorofeachphaseatthegeneratorendandthecurrentofpartialphasesforstatorofeachphaseattheneutralpointside.發(fā)電機縱差保護的原理Principlesofgeneratorlongitudinaldifferentialprotection0201比率制動式發(fā)電機縱差保護原理PrincipleoflongitudinaldifferentialprotectionforratiobrakinggeneratorG發(fā)電機縱差保護原理接線示意圖PrinciplesofgeneratorlongitudinaldifferentialprotectionConnectionschematicdiagram01比率制動式發(fā)電機縱差保護原理Principleoflongitudinaldifferentialprotectionforratiobrakinggenerator動作電流：operatingcurrent制動電流：brakingcurrent當Kb=1時為完全縱差保護接線方式Kb>1時為不完全縱差保護接線方式IopIres動作電流和制動電流的定義Definitionsofoperatingcurrentandbrakingcurrent

1IopIreswhileKb>1,thenon-fullydifferentialprotectionconnectionisapplied式中：IntheformulaWhenKb=1,thefullydifferentialprotectionconnectionisapplied01比率制動式發(fā)電機縱差保護原理PrincipleoflongitudinaldifferentialprotectionforratiobrakinggeneratorIop.min.Ires.min.IresK動作區(qū)制動區(qū)Iop2動作特性曲線Operatingcharacteristiccurve圖9－3比率制動式發(fā)電機縱差保護的動作特性Operatingcharacteristicoflongitudinaldifferentialprotectionofrationbrakinggenerator01比率制動式發(fā)電機縱差保護原理Principleoflongitudinaldifferentialprotectionforratiobrakinggenerator縱差保護的動作判據(jù)Operationcriterionoflongitudinaldifferentialprotection3IOp.min：一般?。?.3~0.5）

UsuallyInIres.min：一般?。?.8~1.0）UsuallyInIres：一般取0.3~0.5Usually02標積制動式發(fā)電機縱差動保護原理Principleoflongitudinaldifferentialprotectionofscalarproductbrakinggenerator動作電流、制動電流及其動作判據(jù)：Operatingcurrent,brakingcurrentandtheoperationcriterion式中：Intheformula動作電流：Operatingcurrent制動電流：brakingcurrent動作判據(jù)：operationcriterionθ

為

之間的相位差；S為標積制動系數(shù)，通常取1.0θisthephasedifferencebetweenand;Sisthescalarproductbrakingcoefficient,usually1.002標積制動式發(fā)電機縱差動保護原理Principleoflongitudinaldifferentialprotectionofscalarproductbrakinggenerator當發(fā)電機正常運行或保護區(qū)外短路時Whenthepowergeneratoroperatessmoothlyorthereisashortcircuitoutsidetheprotectionzone制動量最大，動作量最小，保護可靠不動。當保護區(qū)內(nèi)短路時Whenthereisashortcircuitinsidetheprotectionzone制動量為負值，呈現(xiàn)動作作用，動作量最大，保護動作，且靈敏。采用標積制動式差動保護，可以大大提高反應發(fā)電機內(nèi)部故障的靈敏度。顯然Thebrakingcapacityisthemaximumandtheoperationcapacityistheminimumwithreliableandconstantprotection.Thebrakingcapacityisnegativeshowinganoperationeffect,withlargestamountofoperation,protectionoperation,andhi