500 kV隔离开关二次回路防误改进

The Improvement of Control Circuit of Preventing Misoperation of the 500 kV Isolating Switch

摘要: 本文介绍了500 kV交流站中采用交流控制回路的500 kV隔离开关的二次回路，以及普洱±800 kV换流站中采用直流控制回路的500 kV隔离开关二次回路。论述了采用直流控制回路的500 kV隔离开关存在的运行人员未下发分合命令而自行分合闸的安全隐患问题。提出了在三相操作箱内安装电机电源监视器，将电源监视器的辅助接点接入各相控制回路来消除该隐患的改进方案。所改进的方案在普洱换流站应用后，运行效果良好。

Abstract: This paper introduces the control circuit of 500 kV Isolating switch which adopts AC control loops in the 500 kV substation, and which adopts DC control loops in the ±800 kV converter station in Pu’er. The security hidden danger of auto closing and opening without permission of 500 kV Isolating switch adopting DC control loops is discussed. An improvement of eliminating the hidden trouble is put forward by installing three-phase power monitor in the motor operation loop and accessing the auxiliary contacts of power monitor to control circuit of each phase. And the running effect is good in the converter station in Pu’er after the improved method is applied.