Multi-band Ultrasonic Detection Analysis of the Evolution Process of Point Discharge Under Power Frequency Voltag

Partial discharges (PD) in electrical equipment range from dizziness to breakdown with varying degrees of energy release, manifested as different forms of phenomena such as light, heat, sound, electromagnetic waves. In the existing discharge detecting method, ultrasonic detection can eliminate electromagnetic interference and visually observe the severity of discharge. In this paper, the multi-band analysis of the ultrasonic detection results in the process of discharge evolution is used to analyze the ultrasonic band characteristics of each stage of the discharge, and a set of ultrasonic multi-band detection system is designed to visually detect the PD state of the power equipment.