电气设备悬浮放电与接地电流间关系研究分析

针对GIS及变压器等电气设备中悬浮缺陷引起的局部放电信号及接地电流信号变化.规律,开展试验及研究。搭建了应用于GIS SF。及变压器绝缘油中试验平台,构建了悬浮放电模型,通过在两种试验环境下加压，观察模型在不同电压等级下激发出的局部放电信号和接地电流信号变化规律。通过研究两者之间的相关性分析、接地电流及局放量趋势分析、接地电流频谱分析,确定接地电流能够有效反映电气设备发生悬浮放电。实际应用中,通过监测接地电流变，化规律并结合带电检测综合判断,可以实现对设备局部放电缺陷综合诊断的有效分析。

Research and analysis on the relationship between floated dischargesignal and ground current in electrical equipment

Experiments and researches are carried out for the changes of partial discharge and groundcurrentsignals caused by floated deficiency in the high-voltage electrical equipment such as GIS andtransformer. The floated discharge model and the test platforms are applied to simulate the GIS and oil- immersed transformer. The variation of partial discharge signal and ground current signal wereobserved by increasing the high voltage under the two test conditions.By doing some analysis such asthe correlation between the two signals, the trend of the partial discharge volume and ground current ,the spectrum analysis of the ground current, to verify the fact that the ground current can effectivelyreflect the occurrence of the floated discharge in the electrical equipment. It is of great significance bymonitoring the variation of the ground current and combining with the judgment of the partial dischargedetection.