On-line monitoring device for operating state of GIS isolating switch operating mechanism

CIGRE statistical data illustrates that the majority GIS isolation switch fault comes from the mechanical aspect, so the study of isolation switch fault diagnosis is imperative, and the coil current curve is an important parameter to reflect the mechanical characteristics of circuit breaker, this paper employs Holzer current sensor and rotary displacement sensor to obtain the current-time curve and the travel-time curve during and travel GIS isolation switching time, and according to the change law of curves, it indirectly judges whether the working state of isolation switch is normal, which means monitoring whether the operating mechanism is blocked, the drive motor is disconnected, and the coil isolation position is in place. It has been proved that the monitoring device can meet the requirements of online monitoring working state of isolating switch operation mechanism.