Research on Detection Technology of Large-capacity Capacitor Based on PD of Oscillatory Wave

High-voltage large-capacity capacitors, as an indispensable important electrical equipment in the power grid system, have important applications in many scenarios such as transmission lines, substations, and the end of distribution lines. In the course of use, if problems such as insulation aging occur, it may threaten the personal safety of the people and staff and cause huge economic losses. The purpose of partial discharge detection of high-voltage large-capacity capacitors is to detect the internal defects of the capacitor before the capacitor fails, to understand the insulation state of the equipment in time, to better monitor the deterioration process of the equipment, and to effectively understand the current reality of the equipment health status. At present, capacitor partial discharge detection methods include power frequency withstand voltage method, DC partial discharge detection method and ultrasonic detection method. Each method has some unavoidable defects. The research in this paper intends to use the partial discharge detection technology based on oscillating wave to carry out the insulation fault detection of high-voltage large-capacity capacitors. The monitoring and early warning of early capacitor failures have been realized, and the hidden faults and defects of the capacitors can be found in advance, and the safety and reliability of the equipment can be improved.