针对某水电站接地网改造方案的探讨

Probe into Grounding Grid Reconstruct Programs of Hydropower Station

接地电阻值的大小对变电站的安全稳定运行起着至关重要的作用,某些变电站由于投运时间过长造成地网腐蚀断裂等原因或变电站本身的降阻条件不够使得接地电阻目标值达不到规程要求而使变电站超标运行。对广东省某水电站工频接地电阻超标的原因进行了分析,通过综合分析该水电站的降阻条件,提出了两种设计方案并对其进行了技术经济比较,通过选取更经济的一种设计方案满足了接地电阻目标值降到0.5Ω的要求。

The value of grounding resistance plays a vital role in security and stability running of substation. Some substation operate on over-stand parameters as a result of grid corrosion cracking caused by super-long operation or substation itself not enough to lower the conditions make resistance grounding resistance requirements of the target value of less than a point of order. The reason of overstand frequency grounding resistance is analyzed in a hydropower station in Guangdong Province. Through a comprehensive analysis of resistance reducing condition of the hydropower station, two designs are proposed, technical and economic comparison is carried out. By choosing a more economical design programs to meet the target value of grounding resistance reduce to 0.5Ω.