In power systems， substation sequential control has been referred to as the primary means of scheduling tasks. In order to solve the problem of long confirmation time in the substation knife gate sequence control operation， the real-time video of the knife gate is connected to the sequence control system through the network camera， and the knife gate is tracked in real time through the kernel correlation filtering algorithm， and the motion area detection is detected. The shape of the knife gate changes， and the tracking target is updated in time， so that the nuclear correlation filtering has a stable tracking ability for the target of scale and shape change. The method proposed in this paper can provide the substation operator with intuitive isolation switch status information， reducing the confirmation time in the isolation switch sequence control operation from nearly one hour to 2 minutes， greatly improving the efficiency of the scheduling work.