Research on Lightning Trip Risk Assessment Method of Overhead Transmission Line Based on Multi-Dimensional Information Fusion

The risk assessment of lightning strike trip rate of overhead transmission lines is an important factor for the safe operation of power grids. Aiming at the existing risk assessment methods of lightning strike trip rate of overhead transmission lines, which have problems such as low precision and large artificial influence of assessment factors, this paper proposes an improved evidence theory method for lightning strike trip risk assessment on the basis of multidimensional information fusion. The weights of different characteristic factors are given by entropy weighting method, the distribution functions of different characteristic factors are determined by gray correlation theory, and then fused and the risk level is determined by evidence theory. The feasibility of the method is proved by analyzing the lightning strike trip rate of towers and lines through tests. The results show that the assessment results of the proposed method are basically consistent with the actual situation. The calculated line lightning strike trip rate is 2.3309 times/year per 100 kilometers, and the relative error with the actual value is 0.034, and the accuracy of the lightning strike trip risk of the whole grid overhead transmission line is 96.8%. This study provides a certain reference for transmission line disaster early warning analysis.