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Calculation Method of Lightning Fault Rate of Overhead Lines of Ungrounded Neutral Point System Based on Characteristics of Lines and Line Lightning Corridors

In view of the lack of accurate lightning trip out rate calculation method for overhead lines with ungrounded neutral points, this paper comprehensively considers the lightning protection configuration of transmission lines and the actual lightning activity parameters in the line corridor to carry out theoretical analysis, simulation calculation and scheme research. Firstly, based on the line account information and lightning location system monitoring data, based on the electrical geometry model to determine the impact of lightning on the line, an accurate calculation method of lightning trip out rate is proposed, and the method is used to calculate and verify the lightning trip out rate of a neutral point ungrounded line in a certain area. The results show that the lightning trip out rate calculation method can accurately calculate the lightning trip out rate of the line and the line corridor after considering the lightning characteristics of the line and the line corridor.