高压电缆中间接头局部放电统计特性分析

Statistical characteristics analysis of partial discharge in high-voltage cable joint

设计制作了高压电缆中间接头内部4种典型绝缘缺陷物理模型,并构建了相应的局部放电(Partial Discharge,PD)试验研究平台,利用内置宽频带圆环型传感器获取了不同绝缘缺陷模型下的大量PD数据。通过放电统计特征分析表明,4种放电形式在相位分布和偏斜度、峭度、不对称度等统计特性上有显著的区别,可作为反映不同绝缘缺陷的有效特征。此外,沿面滑闪和导电微粒两种放电对电缆接头绝缘性能的破坏较为严重,建议现场运行应给予高度重视。

Four typical physical models for the internal insulation defects of 110kV cable joint are designed, while the test platform for Partial Discharges （PD） research on cable joint is constructed. A large number of PD data under different models are obtained by inner broadband ring sensor. The statistical analysis on the PD pattern indicates that there are significant differences between four PD forms on the statistical characteristics such as the phase distribution, skewness, kurtosis and degree of asymmetry, which can be used as effective features to reflect different characteristics of PD. Surface discharge and conductive particles may cause more serious damage to the insulation performance of cable joint, so high precaution should be paid on site operation.