一起110 kV敞开式隔离开关合闸失败原因分析

Cause Analysis on Closing Failure of A 110 kV Open-ype Isolating Switch

摘要:

文中分析了隔离开关遥控操作规定及防误闭锁关系，统计了隔离开关操作异常情况，并提出实用性的操作异常处置流程。针对一起特高压变电站主变压器低压侧110 kV电抗器间隔倒闸操作过程中GW55-26DⅡ型隔离开关合闸失败的异常案例，运用异常处置流程，通过分析操作控制回路图及工作原理并梳理现场设备电缆接线以及隔离开关电气闭锁关系，确定了隔离开关拒合的原因并及时排除了故障。所提出的针对性改进措施，对变电运检工作的后续开展具有指导意义。

Abstract:

The remote control operation regulations of isolating switch and the relationship of anti-isoperation locking are analyzed, the abnormal operation situation is counted, and a practical abnormal operation process is proposed. Aiming at an abnormal closing failure of GW55-26DⅡ isolating switch during the switching operation of 110 kV reactor interval at the low voltage side of main transformer in extra high voltage(UHV) substation, through the analysis on the operation control circuit diagram and working principle, and combined with the arrangement of cable wiring of field devices and the analysis on the relationship of electric locking of isolating switch, the reasons for the isolating switch to refuse to close is determined and the fault is eliminated. Finally, the targeted improvement measures are provided, which will benefit the following maintenance in substations.