GIS中自由金属微粒缺陷局部放电信号特征分析

Characteristic Analysis of Partial Discharge Signals of Free Metal Particle Defects in GIS

自由金属微粒是影响GIS设备安全稳定运行的主要缺陷之一,为了进一步分析其产生的局部放电特性,文中设计了可等效模拟真实缺陷的独立密封试验模型,通过调节外施电压、微粒尺寸、微粒个数等措施,对微粒缺陷引发的局部放电PRPD谱图、n-φ谱图进行特征提取,并分析了特征形成的原因,尤其结合微粒运动形态,对各阶段微粒所带电荷的转移、中和现象进行阐述,为后续的研究和现场检测工作提供参考。

Free metal particles are one of the main defects affecting the safe and stable operation of GIS equipment.In order to further analyze the characteristics of partial discharge produced by them,an independent sealing test model which can simulate real defects is designed in this paper.By adjusting applied voltage,particle size and num-ber of particles,PRPD and n-φspectra of partial discharge caused by particle defects are characterized.Analysis of the causes of formation of features,especially in the light of particle motion patterns,the transfer and neutralization of charges carried by particles at various stages are elaborated,which provides a reference for the follow-up research and field detection work.