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1、输电线路绝缘子串防冰闪措施研究第32卷第14期2008年7月电网技术PowerSystemTechnologyVol.32No.14Jul.2008文章编号:1000-3673(2008)14-0019-06中图分类号:TM852文献标识码：A学科代码：470•40蒋兴良1,卢杰1,苑吉河2,罗利云3,张志劲1(1.输配电装备及系统安全与新技术国家重点实验室(重庆大学)，重庆市沙坪坝区400044；2•南岸供电局，重庆市南岸区400060；3.江西省电力公司超高压分公司，江西省南昌市330006)StudyonMeasurestoPr
2、eventIcingFlashoverofInsulationStringsJIANGXing・liangl,LUJiel,YUANJi-he2,LUOLi-yun3,ZHANGZhi-jinl(1.StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology(ChongqingUniversity),ShapingbaDistrict,Chongqing400044,China；2・Nan'anPowerSupplyBureau,N
3、an'anDistrict,Chongqing400060,China；3・ExtraHighVoltageBranch,JiangxiElectricPowerCorporation,Nanchang330006,JiangxiProvince,China)ABSTRACT:InJanuaryandFebruary2008,seriousicedisasterbroughttremendouslosstosomeregionalpowernetworksinSouthernandCentralChina・Theicingflasho
4、verofinsulatorstingsisoneoftheprincipalfactorscausingthisicedisaster,thusthepreventionoficingflashoverofinsulatorstringsissign讦icantforthesecureoperationoftransmissionlineslocatedinice-coveredregions.Throughtheanalysisonicingflashoverofinsulatorstrings,thepapercomparest
5、hecharacteristicofmeasurestopreventicingflashoverofinsulatorstringsoftransmissionlines,pointoutthatthemainreasonscausingicingflashoverofinsulatorstringsaretheaberrationofvoltagedistributionalonginsulatorstringandthecontinuoushighconductivewaterfilmthatappearswhilethebri
6、dgediceiciclesaremolten.Moreover,itisalsopointedoutthatinsomemeasurestopreventicingflashover,thePRTVcoating(permanentroomtemperaturevulcanizedanti-contaminationflashovercompositecoating)cannoteffectivelypreventicecoatingoninsulatorsurface,meanwhile,PRTVcoatingmayreducet
7、heicingflashovervoltageofinsulators,thusitisnotrecommendedtousePRTVcoatingtopreventicingflashover.TheV-typeinsulatorstringandtheinsulatorstringcomposedbyinsulatorswithlargerandsmallersheddiametersalternativelycaneffectivelyincreasetheicingflashovervoltageofinsulatorstri
8、ngs,sotheyarepracticableapproachesforthedesignandrenovationoftransmissionlinesinice・coveredregions・KEYWORDS:tr
