城网电缆绝缘缺陷电场及漏电流仿真分析

Simulation and Analysis of Electric Field and Leakage Current of Insulation Defect in Urban Network Cable

基于Ansoft Maxwell软件建立了城网10 kV单芯电缆缺陷模型,分别对电缆正常运行时、绝缘层带气隙、水隙、有钢钉扎入以及多缺陷组合的情况进行了电场仿真,发现缺陷存在会引起周围电场发生畸变,并通过仿真验证了畸变电场在电缆铜屏蔽层会产生高频脉冲电流现象,为利用漏电流诊断电缆绝缘缺陷方法提供了可行性证明。

A defective single - core power cable paper. Then the operation electric -field of the model cable of city during network is established the normal and other based on defective Ansoft/Maxwell in this circumstances such as with the air gap or water gap in the insulating layer, the steel nail ligation in the power cable and the multiple de- fect combination is simulated. By simulation, it is found that the existence of defects will cause the distortion of the surrounding electric field, and the distorted electric field will produce high frequency pulse current in the copper shielding layer, which provides a feasibility proof for diagnosing the cable insulation defects by using the leakage current.