High-frequency sensor and sensitivity detecting device and method thereof

The invention provides a high-frequency sensor and a sensitivity detecting device and method thereof. The device comprises a signal source, a cable and a local discharge detecting device. The signal source transmits a high-frequency signal to the cable according to a preset frequency, the local discharge detecting device monitors the local discharge of the cable through the to-be-detected high-frequency sensor so as to obtain the local discharge signals of the cable, the amplitude of the high-frequency signal transmitted by the signal source is adjusted repeatedly, the signal, corresponding to the lowest amplitude of the high-frequency signal, in the local discharge signals detected by the local discharge detecting device is searched, and the sensitivity of the to-be-detected high-frequency sensor is determined according to the lowest-amplitude signal. The device has the advantages that sensitivity detection of the high-frequency sensor is achieved by the device, the device is simple in structure and detecting method and simple to operate, intermediate link operation and measuring errors are reduced, high-frequency sensor sensitivity detecting precision is increased effectively, and detecting efficiency is increased effectively.