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1、第34卷第6期中国电机工程学报Vol.34No.6Feb.25,20142014年2月25日ProceedingsoftheCSEE©2014Chin.Soc.forElec.Eng.917DOI:10.13334/j.0258-8013.pcsee.2014.06.013文章编号:0258-8013(2014)06-0917-08中图分类号:TM341发电机绕组匝间故障检测的新型探测线圈12211孙宇光,余锡文,魏锟,黄子果,王祥珩(1.电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系
2、),北京市海淀区100084;2.舰船综合电力技术国防科技重点实验室(海军工程大学),湖北省武汉市430033)ANewTypeofSearchCoilforDetectingInter-turnFaultsinSynchronousMachines12211SUNYuguang,YUXiwen,WEIKun,HUANGZiguo,WANGXiangheng(1.StateKeyLab.ofControlandSimulationofPowerSystemandGenerationEquipmen
3、ts(Dept.ofElectricalEngineering,TsinghuaUniversity),HaidianDistrict,Beijing100084,China;2.NationalKeyLaboratoryforVesselIntegratedPowerSystemTechnology(NavalUniversityofEngineering),Wuhan430033,HubeiProvince,China)ABSTRACT:Concerningthelimitationofthe
4、available明,由于采用特殊的布置及联接方法,开路的新型探测线圈detectionmethodsforthecommoninter-turnshortcircuitsin在电机正常运行或机端外部故障时端口电压为0,而在绕组statorandfieldwindingsofsynchronousgenerators,especially内部不对称故障时会对气隙磁场的故障附加谐波感应出电inthecommonturbo-generators,thispaperputsforwardanew动势。而
5、且在定子内部短路与励磁绕组匝间短路故障这两种typeofair-gapsearchcoils.Theoreticalanalysisshowsthatthe情况下,新型探测线圈端口电压的频率明显不同。在多相整open-circuitvoltageofthenovelsearchcoiliszerounder流实验样机上安装了上述探测线圈,通过实验验证了理论分normaloperationorexternalshortcircuitsatmachineterminals,析的正确性,说明可以根据新型
6、探测线圈端口电压同时反映forthespecialdistributionandconnectionpattern.While发电机的定子和转子绕组内部故障、并通过电压频率特征来asymmetricalfaultsoccurinthewindings,ACEMFcouldbe区分具体的故障类型。inducedinthesearchcoilsbytheadditionalspaceharmonics关键词:新型探测线圈;定子内部短路;励磁绕组匝间短路;ofair-gapmagneticfield,w
7、hichdonotexistundernormal故障检测;谐波磁场;发电机绕组conditions.What’smore,incaseofstatorinternalshortcircuitsandfieldinter-turnshortcircuits,theopen-circuitvoltagesof0引言thesearchcoilsareobviouslydifferentinfrequency.Aseriesof定子绕组内部短路(包括匝间短路、相间短路)experimentsonapol
8、y-phasemodelmachinewithrectifierloadsystems,wherethenovelsearchcoilsareinstalled,verifiesthe是同步电机中一种常见的破坏性很强的故障。现有correctnessofthetheoreticalanalysisonthesearchcoils.Itis的大型水轮发电机已普遍安装了主保护(包括完全feasibletodetectboththestatorinternalfaultsandthefi