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Development and pattern identification of end-winding discharge under effect of relative humidity and temperature for HV motors

查看全文 作　　者：Ailiang [1]Kang;Muqin [1]Tian;Chuanyang [2]Li;Jiancheng [1]Song;Simone Vincenzo [2]Suraci;Wei [1]Li;Lingyan [1]Lin;Zhipeng [1]Lei;Davide [2]Fabiani 高影响力作者 机构地区：[1]Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control,College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,People's Republic of China;[2]Department of Electrical,Electronic,and Information Engineering‘Guglielmo Marconi’,University of Bologna,Viale Risorgimento 2,Bologna 40136,Italy高影响力机构 出　　处：《High Voltage》索引2020年第5卷第4期,共10页高影响力期刊 基　　金：The authors wish to express their deepest gratitude to the financial supports of the State National Natural Science Foundation(Nos.51377113,51577123 and U1510112);which ensured the successful completion of the experiment. 摘　　要：During operation of high voltage(HV)motors,different types of discharges,e.g.surface discharge,corona discharge and bar-to-bar discharge can occur at the same time,increasing the difficulty of partial discharge(PD)sources determination and PDs pattern identification.In this study,the end-winding of a 10 kV motor coil was artificially aged and the related PD was measured.The initiation and variation of different PDs under multi-factor stresses were studied.The localised fingerprints coexisting with multiple PDs were identified and analysed.The results confirm that the end-winding discharge process was significantly influenced by the experiment relative humidity(RH)and temperature.The bar-to-bar discharge was easily recognised at a lower voltage since the identification of bar-to-bar discharge pattern would be affected by the corona discharge pattern at a higher voltage.It is shown that it is more difficult for the corona discharge to be detected when RH exceeded 80%,while the surface discharge dominated at the higher RH.In addition,the PDs were more easily identified with the rise of the temperature.This study can provide a reference in PD identification test and be useful for the PD online monitoring of HV motors. 关 键 词：temperature DIFFICULTY effect
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