Design of Sensor for Detecting Corona Discharge Signal in Specific Band

Corona discharge signal from the high-voltage transmission line exhibits unique characteristics compared to other radiation signals, which include wide distribution of frequency, small signal amplitude and strong randomness. The properties of frequency distribution of corona discharge signal and noise were tested in the range of 0 MHz-1.5 GHz to obtain the most beneficial detecting band. Based on the characteristics and properties, a high-gain helical antenna with the center frequency of 250 MHz was designed, and the performance of the antenna was tested. The corona discharge signal from 550 kV extra-high-voltage power line at the distance of about 320 meters was successfully detected by the helical antenna. The results showed that this design achieves the expected requirements and have a good practical performance. The design of antenna may provide supports for the further research on remote detection system of corona discharge signal.