Research on GIL Fault Diagnosis and Location Method Based on Partial Discharge and Vibration Monitoring

Abstract

Abstract At present, the ultra-high voltage transmission lines in nuclear power plants mostly use Gas Insulated transmission lines (GIL). This type of transmission line transmits large natural power, and GILs are mostly laid through corridors and themselves are metal-enclosed gas -insulated structures, which are affected by the natural environment and have low reliability. high. However, due to the long length of each independent air chamber of the GIL, when it fails, it is accurately difficult to monitor the fault and locate the fault, which reduces the availability of the unit and brings about greater economic losses. In this paper, through the simulation test of the vibration signal propagation when the GIL fails, the signal attenuation law of the vibration signal passing through the insulator is tested, and the fault cell is located through the signal analysis of the vibration sensors in different directions. At the same time, through the simulation test research on the discarge faults of metal spikes, floating potential and metal particles in the GIL, after obtaining the partial discharge signal through the sensor, the corresponding partial discharge eigenvalues are extracted, and the eigenvalues are classified based on the SVM method to realize the GIL fault. Which can provide support for engineering practice.