浅谈变压器励磁涌流产活力理（中英文结合）

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宽的辅助判据，在波宽大于140°（有20°的裕量）时也将差动保护闭锁。休止角原理由于采用按相闭锁的方法，在变压器合闸于内部故障时，能够快速动作。这一点是比二次谐波制动（三相或门制动）方法优越的地方。对于大型变压器，可以同时采用两种原理的纵差动保护，能够起到优势互补，加快内部故障的动作速度，不失为一种好的配置方案。

Mentionedearlier,inthefirstfewwaveform,theflowwillappeardiscontinuousAngle.Andthetransformerinternalfaultintothedifferentialrelayofdifferentialcurrentissinewave,won'tappeardiscontinuousAngle.ContinuousAngleidentificationmethodistousethisfeaturetoidentifyexcitationinrushcurrentandfaultcurrent,bytestingwhetherthereisadiscontinuousdifferentialcurrentwaveformAngle,whenintermittentAngleisgreaterthanthesettingvalueofthedifferentialprotectionatresia.ContinuousAngleofbrakeprotectionsettingvalueisgenerallysetto65°.ForY/dconnectionmodeofthethree-phasetransformer,asymmetricflowdiscontinuousAngleislarge,continuousAngleclosurecomponentscanreliableaction,andsufficientmargin;Andsymmetryofflowdiscontinuitywilllessthan65°Angle.Tofurtherreducethesettingvalueisnotagoodmethod,becausethesettingvalueistoosmallwillaffecttheinternalfaultofsensitivityandspeedofaction.Flowduetothesymmetryofwavewidthisequalto120°,andthefault

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current(sinusoidal)pulsewidthis180°,thusthecontinuousAnglecriteriononthebasisofaddingauxiliarycriterionawideresponsewave,wavewidein140°(20°allowance)willalsobedifferentialprotectionatresia.ContinuousAngleprinciplebecauseuseaccordingtothephaselockingmethod,theswitchingtransformerinternalfault,quicklyaction.Thisisbetterthansecondharmonicbrakebraking(three-phaseordoor)methodissuperior.Forlargetransformer,canadopttwokindsofprincipleoflongitudinaldifferentialprotectionatthesametime,canhavecomplementaryadvantages,tospeedup