A mechanical fault diagnosis method of GIS isolation switch based on the winding current of drive motor and random forest is proposed.The maximum current value of the motor driven by the isolation switch in different operating stages and its appearance time are taken as the characteristic value.Secondly,three types and four kinds of mechanical faults with high failure rate of isolation switch are simulated by using torque loading tool,and a mechanical fault diagnosis model of isolation switch based on random forest is established.Finally,based on the above classification model,the simulated fault types are analyzed,and the classification results show that the mechanical fault diagnosis accuracy of random forest based isolation switch is as high as 90％,which can effectively realize the diagnosis of isolation switch mechanical fault.
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