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| InvestigationonAir-GapDischargePatternsandDevelopmentCharacteristicsofVegetableOil-PaperInsulation |
| CuiLu, ChenWeigen, DuJinchao, LiJian |
| StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology ChongqingUniversityChongqing400044China |
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Abstract Air-gapdefectisacommonpartialdischarge(PD)defecttypeofoil-paperinsulation.Withtheincreasingapplicationoftransformersfilledwithvegetableinsulationoils,itisofgreatsignificancetoinvestigatetheair-gapPDanditscharacteristicsofvegetableoil-paperinsulation.Inthispaper,atypicalair-gapmodelandasimulativeoiltankwereadopted;fromtheperspectiveofPDmechanism,air-gapPDinceptionparametersofvegetableoil-paperinsulationwerecomparedwiththoseofmineraloil-paperinsulation;dischargecharacteristicsduringthewholeair-gapPDdevelopmentprocesswereinvestigatedbyanalyzingcurrentpulsewaveformsandRGBstatisticalpatterns.Itwasfoundthat,theair-gapPDcharacteristicsofvegetableoil-paperinsulationaremoreremarkable,withlowerPDinceptionvoltage,smallerinceptionphaseangle,fewerdouble-peakPDpulses,lowerchargeamplitude,higherrepetitionrateandmoreobvious‘rabbit-ear’patternsthanmineraloil-paperinsulation,whichprovideareferenceforidentifyingair-gapPDanditsdevelopmentcharacteristicsinvegetableoil-paperinsulation.
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Received: 11 December 2016
Published: 26 February 2018
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2018, Vol. 33 
