Low Current Breaking Performance of Gas Arc Spinning for Environment-Friendly High-Speed Grounding Switches

With the background of difficulties in breaking Class B electromagnetic induction current for the 252 kV environment-friendly Gas Insulated Switchgear(GIS) products, to enhance the ability of breaking low current, establish the gas arc numerical calculation model, and simulate the arc external characteristics and physical parameters, as a judgment of low current breaking capacity. In combination with the arc numerical calculation model, we analyze the efficiency of cooling the arc through magnetic blowing, then assisting the arc quenching and optimizing the low current breaking performance of high-voltage equipment. Finally, the LC discharge circuit is used to supply power for the test switchgear, and the arcing experiment under a high-voltage environment is designed and completed to analyze the relevant factors affecting the gas arcing process and to optimize the arc numerical calculation model. During the experiment, we found that the arc-burning time can be shortened from 200 ms to about 120 ms, which means the method worked.