总结了直流和复合电压下油纸绝缘的局部放电检测技术,包括传统的基于脉冲峰值-时间序列的局部放电检测技术,以及能够检测直流下局部放电的基于脉冲电流波形的宽带/超宽带检测技术.深入分析了直流下油纸绝缘的局部放电机理和影响因素,介绍了目前直流局部放电检测与分析技术的研究现状.还分析了±500 kV直流输电系统中整流变压器阀侧绕组绝缘承受的电压波形,讨论了复合电压作用下局部放电呈现出的特性.
Partial discharge detection techniques of oil-paper insulation under DC voltage and compound voltage were summarized,which included traditional detection technique based on pulse peak-time sequence and wide band/ultra wide band detection technique based on impulse current waveform which can detect partial discharge under DC voltage.The mechanism and influencing factors of partial discharge of oil-paper insulation under DC voltage were analyzed,and the research status of partial discharge detection and analysis techniques under DC voltage was introduced.The voltage waveforms of valve side winding of rectifier transformer in ±500 kV DC transmission system were analyzed,and the characteristics of partial discharge under compound voltage were discussed.
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