Simulation Analysis and Fault Location System Design of PARTIAL Discharge Sound Signal in GIS
Aiming at the difficulty of locating the internal insulation discharge fault of gas-insulated fully enclosed combined electrical apparatus(Gas Insulated Sanstation,GIS),this paper aims to realize the accurate monitoring of partial discharge in GIS based on the idea of independent acoustic detection and sensing.Firstly,the transmission mechanism of GIS internal discharge acoustic signal is simulated and analyzed,and a high-sensitivity acoustic sensor is designed based on piezoelectric film material acoustic detection and sensing technology.Secondly,two typical insulation defect models of GIS partial discharge are set up to verify the feasibility and practicability of the device.The results show that in the low frequency range of 1-20 kHz,the difference of relative sound pressure between the discharge location and its adjacent gas chamber is much larger than that in the ultrasonic range,which provides a theoretical basis for detecting GIS internal discharge based on sound.The frequency band of the sound signal under GIS defect discharge is mainly concentrated in 5-20 kHz,and the sound intensity of the discharge chamber is significantly increased compared with that of the adjacent gas chamber.The fault location of the discharge can be determined by comparing the sound intensity of each gas chamber,and finally the GIS discharge location can be quickly and accurately located.
gas insulated switchgeardischarge faultpiezoelectric thin film sensorfault location
万方数据
维普
