46电工电气(2023No.7)作者简介:冯宇哲(1978—),男,工程师,硕士,从事电力设备状态检测评价和技术监督工作。冯宇哲,李卫军,杨立川(国网浙江省电力有限公司电力科学研究院,浙江杭州310014)摘要:转子匝间短路故障是发电机的常见故障之一。某台660MW汽轮发电机在运行状态下的升负荷过程中出现轴振爬升的情况,根据轴振与励磁电流相关性、轴振相位变化、轴振升高时间、密封瓦油温变化、重复脉冲法及转子极间电压法分析,综合判断转子绕组已存在匝间短路故障。经转子返厂解体后,发现4号线圈端部拐角处匝间绝缘发生移位现象,采用转子匝间绝缘双层化方式修复后,机组重新投入正常运行。关键词:发电机;转子绕组;匝间短路;重复脉冲法中图分类号:TM311文献标识码:B文章编号:1007-3175(2023)07-0046-05Abstract:Therotorinter-turnshortcircuitfaultisoneofthecommonfaultsoccurringtothegenerator.Thebearingvibrationclimbinghappenedtoa660MWturbo-generatorinworkingstateduringtheprocessofloadincrease,soaccordingtothecorrelationbetweenbearingvibrationandexcitationcurrent,thephasechangeandrisetimeofbearingvibrationandtheoiltemperaturechangeofsealingpads,thepaperemployedrepetitivesurgeoscilloscopeandrotorinter-polevoltagemethodtojudgethattherotorwindinghasinter-turnshortcircuitfaults.Afterdisassemblingtherotor,itfoundthatinter-turninsulationatthecorneroftheendoftheNo.4coilwasdisplaced.Therefore,double-lay-eredtherotorinter-turninsulationwasadoptedtomaketheunitputintonormaloperationagain.Keywords:generator;rotorwinding;inter-turnshortcircuit;repetitivesurgeoscilloscopeFENGYu-zhe,LIWei-jun,YANGLi-chuan(ZhejiangElectricPowerResearchInstitute,Hangzhou310014,China)DetectionandTreatmentonaRotorWindingInter-TurnShortCircuitFaultofa660MWGenerator660MW发电机转子绕组匝间短路故障检测与处理0引言近年来,伴随特高压直流输电的快速发展,电力系统对动态无功的需求日益增长,加装于换流站的300Mvar大容量调相机组的并网数量快速增加;同时,新能源发电的大规模并网消纳,对电网惯性、短路容量和母线电压的稳定性均提出了更高的要求,10~50Mvar分布式调相机组的并网规模也随之快速提升。其中,特高压送端换流站调相机组和用于支撑新能源消纳的分布式调相机组,其冷却方式均...