基于接地电流高压电缆交叉互联故障分析

Analysis on the cross-bonded failure of high voltage cable based on ground current

为降低高压电缆金属护套感应电压,通常在电缆交叉互联箱内将高压电缆金属护套进行交叉互联。但是由于电缆铺设环境的复杂性,交叉互联箱会出现受潮、进水、外力破坏等诸多情形,导致高压电缆金属护套出现交叉互联故障,给整个系统的安全运行埋下隐患。文章针对110k V XLPE高压电缆的交叉互联故障进行分析,利用ATP-EMTP电磁暂态软件进行建模和仿真,分析总结出不同故障下的接地电流变化特点,为高压电缆的故障检测提供理论依据。

In order to reduce the metal sheath voltage,the high voltage cable metal sheath is usually cross- bonded in the cable cross connection box. Because of the complexity of the cable laying environment,cross connection box will appear damp,water,external damage or other situations,thus leading to the high voltage cable metal sheath cross failure in link box,and bury the hidden trouble to the safe operation of the whole system. This paper analyzes the features of the ground current when the failure of cross-bond in 110 k V XLPE high voltage cable occurs,then models and simulates by ATP-EMTP electromagnetic transient simulation software,which provides a reference for the fault detection of high voltage cable.