A discriminant method of whether lightning flashover occur based on integral area of discretized zero-sequence current

摘要

The application of high-voltage transmission lines protection based on traveling-waves or transient components suffers maloperation in case of lightning strokes on transmission lines. Lighting stroke is one of the important causes of the accidents that occur on transmission lines. With the development of power system, the proportion of outages on transmission lines because of lightning stroke also increases. And according to the lightning accidents results, the lightning stroke characteristics is related to the time factors tightly. In order to analyze the correlativity between the lightning flashover amount and the time factors. The correlativity between the lightning stroke accidents investigation records, the lightning flashover amount of transmission lines increases from the recently years. According to the lightning flashovers mostly happen in the month of June, July, and August. Similarly in each day the flashover amount also varies with the time of day obviously. These lightning flashovers mainly occur during the afternoon. The analysis results in this paper have a good agreement with the meteorological observations and lightning detection data of lightning location system (LLS). And these results provide good reference for the lightning protection work in power system. According to the differences, the paper proposes a method identify lightning flashover based on zero sequence currents. AutoCAD simulation tests prove the method is feasible.