A partial discharge detection device that integrates live indicating, isolating and locating functions

During the operation of the switchgear of pin distribution network, the aging of insulating media leads to partial discharge (PD), which leads to insulation deterioration and power accidents, which seriously affects the safety of the grid and the reliability of the power supply. According to statistics, PD accounts for more than $85 \%$ of switchgear accidents, and accurate detection of PD is crucial to the power system. The existing PD detection technologies, including gas composition monitoring, ultrasonic detection and transient ground wave (TEV) measurement, are limited by low detection sensitivity, weak anti-interference ability or high implementation cost. In this paper, a PD signal coupling sensor (ceramic capacitive core insulator) is used as a live indicator sensor, and a sensing device with live indicator, PD measurement and positioning technology is developed.