Research on Partial Discharge Detection and Location System of Power System Switchgear

Aiming at the problems of difficult partial discharge detection and inaccurate position positioning of power system switch cabinets. This paper proposes to use ultrasonic array to collect partial discharge signals of switchgear, analyze the influence of far-field model, near-field model, ideal model and actual model on ultrasonic signal acquisition respectively, and establish a two-sensor delay model for sound source location of electrical cabinet faults to obtain electrical cabinet faults The spatial coordinates of the sound source. Build a hardware platform through the STM32 sound source localization acquisition system, and perform software programming. The experimental results show that the sound source localization results of the five groups of experimental electrical cabinet faults are 1.6%, 1.5%, 6.7%, 2.0%, and 1.8 respectively. The relative deviations of the partial discharges detected by the positioning system are all within 7%. It is obtained that accurate positioning can be achieved in an ideal environment, which verifies the feasibility of the detection device. Therefore, the practicability of the positioning system is verified, and a basis is provided for the repair of insulation defects in the later period.