配电网消弧柜接地系统运行控制技术分析

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1、ABSTRACTIndistributionnetworks，70percentofthefaultsaresingle—phasegroundingfaultsandmostofthemaretransientarcgroundingfaults．Inordertoeliminatethearcover-voltage，theneutralpointgroundmethodwitharcsuppressioncoilisadopted．Withtheexpansionofthedistribut

2、ionnetworkscale，capacitivecurrenthasgreatlyincreased．Whenthegroundingfaultoccurs，thecapacityofarc—suppressioncoilmustbeincreasedtocompensatethegroundingpointcurrent．Thecostissignificantlyraised．However,arc．overvoltagesuppressorcostslessandisnotaffecte

3、dbygroundcurrent．Andcomplicatetrackingandcompensationcalculationofcapacitivecurrentcanbeleaveout．Inparticular,whenthefaultshappenintransformerandhigh—voltagemotor,arc—overvoltagesuppressorisoperatedwhichwillbringaboutshortcircuitofthetransformerintern

4、alwindings．Anoperationcontroltheoryisproposedinthethesistosolvetheapplyingproblemofarc—overvoltagesuppressortechnologyexistinginlowandmediumvoltagedistributionnetworks．Bycombiningwiththeadvantagesforthesetwofaultrecognitiontechnologyandadoptinginforma

5、tionfusiontechnologytocompensatetheweaknessofthetwodifferentfaults，theoperationandcontroltechniquesisproposedbeforetheactionofarc—overvoltagesuppressor．Consideringabouttheeffectsofasymmetricsystem，allkindsofdisturbancesandtheprobablewrongrecognitionma

6、kingthearc—overvoltagesuppressoract，thesequencecurrentinthewholesystemshouldbeanalyzedfordifferentfaultsaftertheactionofarc-overvoltagesuppressortomakesurewhethertheaetioniSrightornot．Thenthearc—overvoltagesuppressorcanbeproperlycontrolled．Thedamageac

7、cidenceofthetransformerwillbeavoidedinarc—overvoltagesuppressorgroundedpowersystem·Theproposednovelarc-overvoltagesuppressoroperationcontroltheorycaneffectivelyidentifysingle—phasegroundingfaults，transformerinternalfaultsandloadtransformerinternalfaul

8、ts．Thearcover—voltagesuppressorandtransformerprotectionarecontrolledtOwork．Transformerburningresultingfromwrongoperationofarcover．voltagesuppressorisavoided．ItisverifiedbyMATLABandEMTPsimulation．KeyWords：DistributionNetwork：Arc—overvoltageSupp