2008年11月电工技术学报VO1．23NO．11第23卷第11期TRANSACTIONS0FCHINAELECTROTECHNICALSOCIETYNOV2008配电网缆一线混合线路故障选线的可拓融合方法束洪彭仕欣2李斌赵兴兵(春1明理工大学电力工程学院昆明6500512．云南电网公司昆明供电局昆明6500113．云南省电力设计院昆明650051)摘要城市配网缆一线混合线路的应用越来越广泛，单位长度电缆较架空线路充电电容大，且电缆参数依频特性严重，缆一线混合线路单相接地的电压电流故障暂态分量更为显著。提出了配电网缆．线混合线路暂态量故障选线的可拓融合方法，运用可拓理论将各馈出线故障零序电流的感性衰减直流分量特征与暂态分量小波包分解综合相关系数进行融合。以可能的故障线路集合、故障特征集合和特征规定的量域作为可拓融合的物元三要素，以衰减直流分量和小波包分解综合相关系数作为特征集合。根据故障合闸角的大小客观地确定权函数，利用可拓关联函数计算各条线路故障的置信度，根据置信度判断故障出线。大量仿真结果表明该方法选线准确、可靠。关键词：缆．线混合线路单相接地故障衰减直流分量相关系数可拓理论中图分类号：TM773；TM762．25FaultLineDetectingApproachtoHybridFeedersConsistingofPowerCablesand0verheadLinesinDistributionNetworkUsingExtenicsShuHongchunPengShixinLiBinZhaoXingbing。(1．KunmingUniversityofScienceandTechnologyKunming650051China2．KunmingPowerSupplyBureauinYunnanPowerGridKunming650011China3．YunnanElectricPowerDesignInstituteKunming650051China)AbstractWithwide-areaapplicationofhybridfeedersconsistingofpowercablesandoverheadlinesindistributionpowersystem，anewintegratedfaultlinedetectingmethodusingextenicsisproposed．CharacteristicofdecayingDCcomponentandcorrelationcoeficientoftransientcomponentwaveletpacketdecompositionarecombinedusingextenics．Threefactorsofmatter-elementinsingle-phasefaultlinedetectionareconfirmed，whicharethepossiblefaultline’Saggregate，itscorelativecharacteristicaggregateandquantityfieldwiththestatedcharacteristic．Thecharacteristicaggregateincludesthedecayingdirectcurentcomponentandcorelationcoeficientofwaveletpacketdecomposition．Confirmingthecorrelativeweightfunctionbasedonfaultswitchingangleandcalculatingtheconfidencemeasuresofeachlineusingextendedrelationshipfunction，thefaultlinedetectionisrealized．Simulationsindicatethatthefaultlinedetectingmethodiscorrectandreliable．Keywords：Hybridfeeders，singlephase—to·earthfault，decayingDCcomponent，correlationcoeficient，extenics国家自然科学基金(50847043，50467002，50347026)，云南省科技攻关项目(2003GG10)和云南省自然科学基金(2005F0005Z，2004E0020M，2002E0025M)资助项目。收稿日期2008．0428改稿日期2008—08—07