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1、基于模态分析的变压器铁芯故障诊断*赵莉华1,程胤璋1,武立平2,马维青2,贾志义2,王仲1(1.四川大学电气信息学院,成都610065;2.国网山西省电力公司阳泉供电公司,山西阳泉045000)摘要:为诊断变压器铁芯松动故障,提出了基于模态分析的故障诊断方法,通过变压器振动信号与铁芯固有频率的共振响应识别变压器故障。该方法的应用首先需要确定变压器铁芯固有频率随铁芯松动的变化规律,采用仿真软件ANSYSWorkbench确定了变压器样机不同预紧力下铁芯固有频率的变化规律,再结合实验条件下采集的变压器铁芯故障前后的振动信号,验证了振动信号与铁芯固有频率的共振响应可以有效反映变压
2、器故障状态。研究结果表明,铁芯固有频率会随着松动程度增加而减小。变压器样机发生铁芯松动故障后,振动信号与铁芯固有频率在500Hz分量处发生共振,幅值出现显著增大。关键词:变压器;铁芯松动;有限元;模态分析;振动信号中图分类号:TM43文献标志码:A文章编号:1001-1390(2019)00-0000-00TransformercorefaultdiagnosisbasedonmodalanalysisZhaoLihua1,Cheng,ChengYinzhang1,Wu,WuLiping2,Ma,MaWeiqing2,Jia,JiaZhiyi2,Wang,WangZhong
3、1(1.(1.SchoolofElectricalEngineeringandInformation,SichuanUniversity,Chengdu610065,China.2.State2.YangquanPowerSupplyCompanyofStateGridShanxiElectricYangquanPowerSupplyCompany,YangquanCompany,Yangquan045000,Shanxi,China))Abstract:AAbstract:Afaultdiagnosismethodbasedonmodalanalysisispropose
4、dtodiagnosetransformercoreloosefaults,andtheresonanceresponseofthetransformervibrationsignalandthenaturalfrequencyofthetransformercorecanbeusedtoidentifytransformerfaults.Theapplicationofthismethodneedtoidentifythenaturalfrequencychangingruleoftransformercoreinunderdifferentloosingconditio
5、ns,andtheANSYSWorkbenchisusedtoidentifythenaturalfrequencyoftransformercoreunderdifferentpre-tighteningforce,changingruleofvibrationsignalindifferentexperimentalconditionsisalsocombinedwiththispapertoverifythattheresonanceresponseofnaturalfrequencyandvibrationsignalcanreflectthestateoftran
6、sformerfaultseffectively.Theresearchresultsshowthatthenaturalfrequencyofironcoredecreaseswiththeincreaseoflooseness.Oncethetransformerironcoreoftransformerfails,Thetheresonanceresponseofvibrationsignalandthenaturalfrequencywillbetakenplaceinthe500Hzcomponent,andtheamplitudeofthevibrationsi
7、gnalwillincreasessignificantly.Keywords:transformer,loosecore,finiteelement,modalanalysis,vibrationsignal0引言*基金项目:山西省电力公司科技项目(5205C0170007)电力变压器在运输、使用过程中出现的碰撞、挤压和外部短路故障等将导致铁芯松动变形,可能造成严重事故。所以,对变压器铁芯状态进行检测,对电网系统的安全运行有着重大意义。近年来,美国、俄罗斯的一些专家学者对变压器的在线检测进行了深入的研究,并提出了