电缆故障会影响电力的传输和分配,局部放电是电缆早期故障的表现之一,对其进行分析研究可以及时发现和修复故障.搭建了电缆局部放电试验平台,制作了环切划痕、气隙和金属颗粒等3种电缆缺陷,对电缆进行逐级加压,获得了10 kV交联聚乙烯电缆在多个电压等级下的高频电流数据,对其进行分析表明:3种不同缺陷电缆的特征差异较为明显,可以为电缆局部放电类型识别提供良好的参考依据.
Cable faults can affect power transmission and distribution.Partial discharge(PD)is one of the manifestations of early cable faults,and its analysis and study can detect and repair the faults in time.The paper sets up an experimental platform for cable partial discharge,made three kinds of cable defects such as loop-cut scratches,air gap and metal particles,and applies pressure to the cable step by step.The high-frequency current data of 10kV cross-linked polyethylene cable under multiple voltage levels are obtained and analyzed.Analysis showed that the characteristics of the three cables with different defects are significantly different,which can provide a good reference for the type identification of cable partial discharge.