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Study of partial discharge characteristics at repetitive square voltages based on UHF method

Science China(Technological Sciences) 2013年第1期56卷 262-270页

作者： WANG Peng WU GuangNing GAO Bo LUO Yang CAO KaiJiang School of Electrical Engineering Southwest Jiaotong University

Due to overvoltage produced by inverter output,inverter-fed motor insulation systems often experience fast electrical aging process,especially when partial discharge(PD) is *** putting into use,the PD detection should be performed on inverter-fed motors at repetitive square voltages to avoid the PD caused insulation deterioration when the motors are collected to inverters having specific ***,unlike PD tests at AC/DC voltages proposed in IEC 60270,the PD detection at repetitive square voltages is much more complex because of serious interference generated by impulse *** solve the problem,ultra-high frequency(UHF) method seems recommendable for its preferable signal-to-noise ratio(SNR).The chief aim of this study is to investigate PD pulse and statistical characteristics of turn-to-turn insulation for inverter-fed traction motors.A square-shaped Archimedes antenna,specially designed for the PD detection at repetitive square voltages of fast rise times,was used to perform PD tests on turn-to-turn insulation *** and frequency analysis results indicate that energy component of generator disturbance and PD pulses are mainly distributed in the 0-0.5 GHz and 0.6-1.5 GHz range,*** on the results,suitable filter was designed for power disturbance ***,resorting to the sensor unit(*** and filter) and the PD test system,the PD statistical features at square voltages of different frequencies were *** results show that higher frequency will give rise,statistically,to PD of lower magnitudes distributing at smaller phases.A reasonable interpretation of this phenomenon was ***,according to the PD statistical features,some suggestions for the PD detection system design,generator parameter optimization and the PD pulse extracting were *** results of this work would be beneficial to the increase of the sensitivity when performing the PD detection on insulatio

关键词： inverter-fed motors insulation system partial discharge UHF square voltage antenna filter

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