棒电源系统差动保护动作原因分析

Reason analysis of differential protection action of control rod power supply system

针对棒电源系统在现场联合调试过程中出现差动保护动作的问题,进行初步原因分析、主要原因确认、差动继电器测试、负载电流测试、差动保护定值调整、差动保护故障仿真和棒电源系统联合试验。仿真和试验结果表明,找出的差动保护动作原因准确,采取的改进措施恰当。改进后的棒电源系统在联合试验过程中未出现差动保护动作现象,运行正常。棒电源系统与现场联合运行之间的匹配性进一步提升。

As for the problem of differential protection action of rod power supply system during field joint debugging,preliminary cause analysis,major cause identification,differential protection relay test,load current test,differential protection setting adjustment,differential protection fault simulation,and joint test of rod power supply system have been done.Simulation experimental results show that the differential protection action reason found out is accurate and the improvement measure taken is appropriate.There is no differential protection action of the improved rod power supply system during field joint debugging.The rod power supply system is operating normally.And the reliability of rod power supply system is further improved.