交流电源串入直流回路误动事故分析

Fault Analysis of Mal-operation Caused by Serial Connection of AC Power to DC Circuit

分析一起交流电源串入直流回路误动事故,确认其原因是直流回路控制电缆过长,对地分布电容大;提出了缩短直流控制电缆长度、提高中间继电器和开关跳闸线圈工作电压、采用光缆代替电缆、提高中间继电器功率等多种解决措施。

Through the analysis of mal-operation accident caused by the AC power serially connected into DC cir- cuit,it is deduced that the reason for the fault is due to the long DC control cables and large distributed capacitance. There- fore, several measures, such as shortening the DC control cable length, improving working voltages of the intermediate relay and the switching trip coil, utilization of the optical cable rather than electric cable, and improving the relay power of the intermediate relay, are adopted to solve these problems.