《电力系统继电保护及应用》课件-24. Test method for directional elements

TestmethodfordirectionalunitTestmethodfordirectionalunitdirectionalunitcurrentunit＆tovercurrentprotectionactionDirectionovercurrentprotectionmainlyconsistsofdirectionalunitandovercurrent

unitTestmethodfordirectionalelementsdirectionalunitcurrentunit＆tovercurrentprotectionactionConditionsfordirectionalcurrentprotectionaction:

1.Actionofdirectionalunit;2.Actionofovercurrent

unitRangeofactionofthedirectionalelementAsshowninthefigure:themaximumsensitiveangleoftheprotectiondeviceisfixedat-30degrees,andthepowerdirectionunitis90degreeswired.RangeofactionofthedirectionalelementTherangeofactionofphaseAisshowninFig,andtheanglebetweenIaandUbcrangesbetween-120and60degrees.RangeofactionofthedirectionalelementIfUaisusedasthereferencevector,theactionrangeofIaisbetween30degreesand-150degrees.Thetestcompletedthecalibrationofthe30-degreesum,-150,ofthesetwoboundaries.testprocedure1.Testwiring3.Viewthesettingvalue2.Putintoprotection4.TesteroutputTestwiringConsultdrawingsTestwiringCompletethewiringPutintoprotection1.Input

zone1ofcurrentprotection2.Inputdirectionalprotectionunit3.ExitotherprotectionViewthesettingvalue1)Thesettingvalueofzone1ofcurrentprotectionis4A;2)Maximumsensitiveangleofthedirectionalunitis-30degrees;3)TheboundaryvalueiscalculatedbyusingtheAphasedirectionelementasanexample.(30degreesand-150degrees)Thetesteroutputstatesequence1)normalstatusUa=57.7∠0°VUb=57.7∠-120°VUc=57.7∠120°VIa=1.00∠0°AIb=1.00∠-120°AIc=1.00∠120°AThetesterincreasestheamountstatesequence2)faultfaultstateIa=4.5∠31°Aoutputtime1SObservetheprotectionaction:thefaultoutsidethearea,theprotectionshouldnotbemovedThetesteroutputstatesequence3)faultstateIa=4.5∠29°Aoutputtime1SObservetheprotectionaction:thefaultinthearea,theprotectionshouldbemovedThetesteroutputstatesequence4)faultconditionIa=4.5∠-151°Aoutputtime1SObservetheprotectionaction:thefaultinthearea,theprotectionshouldnotbemovedThetesteroutputstatesequence5)faultstateIa=4.5∠-149°Aoutputtime1SObservetheprotectionaction:thefaultinthearea,theprotectionshouldbemovedsummaryThe30°boundary:When31°,directionalprotectionunitdoesnotact;When29°,directionalprotectionunitact;-150°boundary:-151°,-149°.When-151°,directionalprotectionunitdoesnotact;When-149°,directionalprotectio