降低变电站接触电势的措施分析及应用

Analysis and Application of the Measures to Reduce Touch Potential in Substation

针对变电站内接触电势难以满足要求的现状,分析了相应的解决措施,并结合某500 kV变电站的实际情况,从提高电势的允许值入手,在系统发生单相接地短路故障后,使得变电站内的接触电势满足要求,得出了通过在变电站内铺设高电阻率结构砾石路面的方法可以有效降低站内接触电势的结论。并利用2020年系统远景规划数据进行校验,结果表明,在电网规划水平年内,系统发生单相接地故障时,变电站内接触电势仍能满足要求。

The paper aiming at the status of touch potential hard to meet the demands in substation,analyses the corresponding measures. Based on the 500 kV substation reality, start from to increase the allowable value potential, in order to satisfy the requirements of the touch potential in substation, when the system has the single-phase grounding fault, reach the conclusion that laying of high resistivity structure of gravel road can effectively reduce the touch potential of the substation. Verify the results using system planning data in 2020, the results show that,when the system has the single-phase grounding fault,the touch potential in substation can meet the demands,in the level of the power grid planning years.