In view of such problems as failure of drive chain and blockage of drive mechanism of disconnector in 550 kV GIS in the actual operation

the equivalent model of the disconnector is set up

the equivalent load torque and equivalent moment of inertia are calculated and the motion coordination relationship between disconnector and motor operating mechanism is analyzed. On the basis of the comparison and analysis of their structure

the torque

current and acceleration of the opening and closing drive motor of the disconnector of the GIS under two different types of faults are simulated ad analyzed by using Ansoft software.The results show that the current commutation is not detected and the current is basically stable after the driving motor exceeds the normal commutation time range

which indicates the occurrence of jam and locked rotor fault;In case that the first commutation time is significantly different from the normal situation

it indicates that the load has significant variation. Time in advance will likely cause the driving parts to loose and thereby load reduction. While the time delay will probably lead to jamming of parts and thereby increase of friction and load.