Research of Online Monitoring Technology for Partial Discharge of Ring Main Unit Based on Capacitance Coupling Method
The proportion of insulation discharge breakdown faults in the ring main cabinet is relatively high.The power supply company must regularly inspect and detect the partial discharge situation of the ring main cabinet every year,but there are still omissions and misjudgments.In order to understand the partial discharge situation of the ring main cabinet in real time,directly obtain discharge information from the inside of the ring main cabinet using capacitive sensors configured with live displays in the ring main cabinet is proposed,without the need to install expensive ultra-high frequency and ultrasonic probes.A passive network transformer is proposed to filter out low-frequency signals with higher amplitudes,and a high-speed A/D and FPGA with a sampling frequency of 50 MHz are used to quickly collect partial discharge signals.Based on STM32 embedded technology,an online monitoring device for partial discharge is developed,and corresponding software is developed to plot the waveform and spectrum of partial discharge.A partial discharge experimental platform is built for comparative testing of partial discharge.The results show that the developed online monitoring device meets the design requirements for partial discharge monitoring.This monitoring device can replace traditional live displays and has the advantage of easy installation,which is of great significance for ensuring power supply safety.
capacitance coupling methodring main unitpartial dischargeonline monitoring
万方数据
维普
