Since the earth leakage protection circuit of KV level power supply system was frequently out of order in Huozhou mining bureau,the reform of the circuit was done.

• 针对霍州矿务局千伏级供电系统漏电保护电路,经常发生故障的现象,提出对该漏电保护电路进行改造,对于改制的原理及方法都进行了较为详尽地阐述。