220kV备自投装置闭锁放电回路隐患分析与改进

Analysis and Improvement of External Blocking Circuit in 220 kV Standby Power Supply Automatic Switching

对某变电站220 kV备自投装置外部闭锁放电回路进行分析,指出当母联充电保护动作时存在误闭锁备自投、母联断路器失灵保护动作时无法闭锁备自投的隐患,提出了相应的改进方案,提高了备自投动作可靠性。

This paper analyzes external blocking circuit of 220 kV standby power supply automatic connection device in a substation and indicates that there are maloperation of standby power supply automatic connection device locking during bus coupler charging protection and failure of standby power supply automatic connection device locking during malfunction of bus coupler breaker.The paper proposes the improvement and enhances action reliability of standby power supply automatic connection device.