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1、变电站接地网电磁诊断法的试验研究施会1,王丰华2,胡徐铭2,茅晓亮1,吕佩佩1,孟琦斌1(1.国网上海市电力公司奉贤供电公司,上海201400;2.上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240)摘要:为进一步提高变电站接地网故障诊断的准确性,本文以某实际35kV变电站接地网为研究对象,通过模拟接地网导体腐蚀、断裂、虚焊等典型故障,对接地网正常与典型故障下的地表电位和磁感应强度进行了测试分析。试验结果表明:接地网导体出现不同故障类型时,地表电位和磁感应强度呈现出不同的变化规律,综合分析接地网的地表电位和磁感应强度可较为准确地实现变
2、电站接地网故障诊断及故障类型识别。接地网存在混合故障时,故障导体地表电位和磁感应强度变化规律与单一故障的情形类似,但变化幅度更大。研究结果可为变电站接地网的故障诊断提供重要依据。关键词:接地网;地表电位;磁感应强度;故障诊断中图分类号:TM933文献标识码:B文章编号:1001-1390(2018)00-0000-00Experimentalstudiesonsubstationgroundinggridfaultdiagnosisusingelectrical&magneticelectromagneticdiagnosismethodShiHui1
3、,WangFenghua2,HuXuming2,MaoXiaoliang1,LvPeipei1,MengQibin1(1.FengxianPowersupplySupplybranchBranchcompanyCompany,ShanghaiMunicipalElectricPowerCompany,Shanghai201400,China.2.KeyLaboratoryofControlofPowerTransmissionandConversion,MinistryofEducation,ShanghaiJiaoTongUniversity,Sha
4、nghai200240,China)Abstract:InorderTotofurtherincreasetheaccuracyoffaultdiagnosisofsubstationgroundinggrids,a35kVsubstationisstudiedtomeasurethesurfacepotentialandmagneticinductionintensityundernormalconditionconditionsandtypicalfaults,wherethefaultofcorrosion,brokenandincomplete
5、weldarefaultsofcorrosion,brokenandincompleteweldaresimulatedinthispaper.Thetestresultshaveshownthat,thesurfacepotentialandmagneticinductionintensityofgroundinggridarechangeddifferentlyunderdifferentfaultcircumstances.Accordingtothecomprehensiveanalysisofthevariationsofsurfacepot
6、entialandmagneticinductionintensity,thefaultanditstypecanbeidentifiedaccurately.Forthehybridfaultingroundinggrid,thevariationsofsurfacepotentialandmagneticinductionintensityaresimilartothesinglefaultwithlargervariationdegree.Thisresultmayprovideimportantbasisforfuturefaultdiagno
7、sisofsubstationgroundinggridfaultdiagnosis.Keywords:groundinggrid,surfacepotential,magneticinductionintensity,faultdiagnosis0引言接地网作为变电站的重要组成部分,承担着保证电气设备良好接地的任务。但是,接地网导体埋于地下,不可避免地会出现腐蚀、断裂等故障,从而有可能造成事故,带来巨大的经济损失[1-2]。因此,准确诊断和定位接地网故障对于电力系统的安全稳定运行有着十分重要的意义。目前,运维人员主要通过定期大面积开挖变电站地面来对接
8、地网导体状态进行诊断,不仅代价高,而且由于无法事先确定故障位置,具有一定的盲目性。而接地网故障