750kV EV-800DW/4000型隔离开关防误闭锁回路的改进

Improvement on Error Blocking Proof Circuit for 750 kV EV-800DW/4000 Model Isolating Switch

750 kV示范工程官亭变电站2号高压电抗器的进线隔离开关,是引进美国的EV-800型隔离开关。在实际应用中发现隔离开关与接地隔离开关电气闭锁回路不完善,将会造成机械闭锁装置的损坏。在A、B、C三相隔离开关与接地隔离开关操作机构回路中加装电气闭锁回路,就可有效地防止机械闭锁装置的损伤。

The inline isolating switch of No. 2 HV reactor for the demonstration project at 750 kV Guanting Substation is EV - 800 model isolating switch imported from USA. In the practical operation the electrical blocking circuit between the isolating switch and ground isolating switch has been found not perfect, which will result in damage of the mechanical blocking device. Addition of the electfical blocking circuit in operating mechanism circuit between isolating switches of A, B and C phases and ground isolating switches can prevent the mechanical blocking device from damage effectively.