110kV电缆金属护层接地系统分析

Analysis of Grounding System for Metal Sheath of 110kV Cable

以某市政工程为例,基于理论计算和实际测量分析金属护层接地系统最优配置,发现受制于现场环境的原接地系统存在部分电缆接地环流过大、护层电压超过规定值的问题,危及运行人员安全。根据相关规程规范和计算推演,提出了接地系统变更方案,并就安装工艺、防水措施等方面进行了改进。

Based on an actual municipal works as an example, this article uses the theoretical calculation and actual measurement verification to analyse the optimal configuration of the metal sheath grounding system. It′s found that the original grounding system subject to the limitations of the site environment has some problems that ground circulating?current of some cables are too large, and sheath voltage exceeds the rated value, which endangers the safety of operators. According to the relevant regulations, calculation and deduction, the change scheme of grounding system is proposed, and the installation technology, waterproof measures and other aspects are improved.