大型高压电机故障诊断与维修技术研究

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中图分类号：TU761.1 文献标志码：B 文章编号：1004-4345（2026）01-0032-05

AbstractAddressingthestatorinsulationbreakdownina10kV/960kWhigh-voltage motorafter61OO0hoursofoperation，a disassemblyispectionandfaulttreeanalysiswereconductedtorevealthefailuremechanism.Theresultsindicatethatmicroracks developedattheslotexitduetoprolongedexposuretoOHzelectromageticvibration.Partialdiscargeactivitypropagatedalong thesecracks，andthedischargebyproductsreactedwithsulfurintheenvironmenttoformCuScrystals，acceleratinginsulation degradationandultimatelyleadingtoagroundfault.Long-termoperationattemperatures angingfrom110to12OCexacerbated thermalaging，servingasasignificantcontributingfactortothefailure.Basedontheidentifiedfluremechanism，acombinedepair strategy was formulated， incorporating VPI process，anti Π-Π corona structure optimization，and dynamic balancing correction. The repair result showed that an insulation resistance reached 34GΩ ， partial discharge magnitude was ≤5O pC，and a vibration velocity RMS value was 0.2mm/s ，with all performance indicators meeting the requirements of GB/T 755—2019 and ISO1940.For preventive maintenance，acomprehensiveearlywaingsystemwasestablished，integrating HFCT-basedonlinepartialdischargemonitoring vibrationspectrumanalysis，andtheArhenustemperaturemodel.Bysetinghardthresholds，thesystemcanidentifypotentialrisks upto72hoursbeforefilure，potentiallextendingthemotor’sservicelifeby5to8yars.Thisstudyprovidesatechnicalreference for fault diagnosis and predictive maintenance of similar high-voltage motors.

Keywordshigh-voltage motor;insulationbreakdown;partial discharge monitoring; VPI technology;preventive maintenance; vibration analysis

2024年9月24日，金冠铜业1台YKSD1000-4型高压电机（ 10kV/9600kW ）突发定子绝缘击穿事故，导致全厂供氧中断 14d ，直接经济损失逾千万元。（剩余7123字）