长距离电缆隧道接地系统设计

Design of Long Distance Cable Tunnel Grounding System

接地设计是隧道电缆系统安全运行的重要组成部分,分析人工接地系统中影响接地电阻、跨步电压、接触电压的内外部因素,提出对高土壤电阻率地区的电缆隧道增设隧道工作井顶部地面作为接地网的方案,同时对土壤腐蚀性、热稳定系数、价格进行技术经济比较,选择铜覆钢材质作为接地体材质,最后对电缆隧道人工接地系统提出了建议。

The grounding system is an important part of the tunnel cable system for its safe operation.By analyzing the internal and external factors which affecting the grounding resistance,step voltage,and contact voltage in the artificial grounding system,it is proposed to add a ground system on the top of the tunnel working well for a cable tunnel in a high soil resistivity area.By making the technical and economic comparisons of soil corrosion,thermal stability coefficient,and price,Copperplated steel was selected as the grounding body.Finally,recommendations were made for an artificial grounding system in the tunnel cable.