Isolating switch state monitoring system

The utility model belongs to the field of power system equipment, namely an isolating switch state monitoring system. The system comprises an electric field sensor, a temperature sensor and a partial discharge sensor, each sensor is connected with a computer host for acquisition and processing, and the host is provided with an indication signal output unit; the partial discharge sensor is a self-complementary arm structure plane equiangular helical antenna with the bandwidth of 500MHz-2GHz, and the corresponding inner radius r0 and the corresponding outer radius R are 37.5 mm and 150mm respectively; the temperature sensor is installed on the L-shaped support, a long-strip-shaped installation hole is formed in the vertical edge of the L-shaped support, and the threaded end of the temperature sensor is inserted into the long-strip-shaped installation hole and then is fixedly connected with the long-strip-shaped installation hole through a nut. A control circuit of the electric field sensor comprises a sensor ci