Statistics for Lightning Parameters of Transmission Lines Based on Tower Block Method

When the traditional tower circle method is used to calculate the lightning parameters of transmission lines, because the radius of the tower circle is far greater than the span, there will be many overlapping areas. The lightning parameters in the overlap areas will be calculated many times, it will not only increase the calculation amount, but also lead to inaccurate results. In this paper, a new statistical method for lightning parameters of transmission lines is proposed. The line corridors are divided into block rectangles of equal size, which are close to each other as much as possible to reduce the impact of overlap. Taking the 500kV Xianmeng I transmission line as an example, the lightning density of each tower is calculated by block method and the lightning risk assessment is carried out. Compared with the traditional method, the results of the block method can better reflect the lightning parameter characteristics of the local tower.