基于超高频法的GIS绝缘子内气隙放电特性研究

摘要：为了分析和评估GIS中盘式绝缘子内气隙缺陷局部放电的危害程度，提高局部放电检测水平，试验设计了绝缘子内单一气隙模型。用超高频法对局部放电进行了测量，获得了气隙放电起始电压，熄灭电压，局放信号波形。比较了不同电压下气隙局放图谱的特点，分析了气隙放电的发展过程和不同电场下放电的变化规律。试验结合气体放电理论探讨了绝缘内部气隙放电的机理。结果表明：随着电压的变化，绝缘子内气隙发生的局部放电表现出不同的阶段性特征，实验结果对GIS现场耐压试验和缺陷识别具有指导意义。

Partial Discharge Characteristics of Gas-gap Defect within insulator in GIS on UHF Method

Abstract: In order to analysis and assessment partial discharge harmful levels aroused by basin-type insulators in GIS, improve the test level of partial discharge, have designed insulator model within a single gas-gap. It have measured PD signals by UHF and obtained PD initial voltage, extinction voltage and PD signal waveform. Compared the characteristic of PD spectrum , analyzed the process of the development of gas-gap discharge and variation in different electric field. Discussed the PD mechanism combined test with gas-gap discharge theory. The result show that:as the voltage changes, PD increased by the gas-gap insulator appeared different stage characteristics. The results have a significance to the withstand voltage test and defects recognition in GIS.