GIS中典型绝缘缺陷模拟及局部放电信号特征分析

摘要

气体绝缘组合电器（gas insulated switchgear，GIS）以其占地面积小、不受天气影响、可靠性高等的优良性能在电力系统中的得到了广泛应用，然而，GIS内部会出现由于绝缘缺陷引起的局部放电（partial discharge，PD），PD长时间发展会导致GIS绝缘损害，对PD进行检测显得尤为重要。文章模拟了高压导体尖刺、盆式绝缘子表面金属颗粒和外壳尖刺3种典型的绝缘缺陷，采用脉冲电流法和超声波检测法对其产生的局部放电信号进行了检测，得到了相应的信号特性，对现场应用起到了一定的指导意义。%Gas insulated switchgear(gas insulated switchgear,GIS)has excellent performances such as small area,not affected by atmosphere,high reliability.So it has been used more and more widely in the power system.However,But the partial discharge would occur because of insulation defect,PD will lead to the GIS insulation damage after a long time,and will lead to serious consequences without treatment in time,there-fore,the PD detection is particularly important.Article simulates the high voltage conductor spikes,basin insulator metal particles on the surface and the shell spike the insulation of the three kinds of typical defects,using the pulse current method and ultrasonic method to test partial discharge signals and get the corresponding signal characteristics,which play certain guiding significance for field applications.