继保直流操作回路在线监视及故障预警

Online Monitoring and Fault Warning of Relay Protection DC Circuit

保护装置、直流操作回路、测量系统等继电保护硬件缺陷是导致隐性故障发生、推动连锁故障发展的重要原因。通过搭建直流操作回路模型,分析了常规红绿灯回路监视等现有直流操作回路监视方法的缺陷。借助跳/合闸线圈辅助触点、附加电阻、时间继电器等,提出了直流操作回路全工况在线监视与故障预警方法,有利于直流操作回路运行状态分析及隐性故障排查,同时能够保证直流操作回路的安全运行。

The hardware defects of relay protection,such as protection device,DC operation circuit and measurement system,are the important reasons for the occurrence of hidden faults and the development of cascading faults.By building a DC operation circuit model,the defects of existing DC operation circuit monitoring methods such as conventional traffic light circuit monitoring are analyzed.With the help of auxiliary contact of tripping/closing coil,additional resistance and time relay,the on-line monitoring and fault early warning method of DC operation circuit under all working conditions is proposed,which is conducive to the operation state analysis and hidden fault investigation of DC operation circuit,and can ensure the safe operation of DC operation circuit.