Transmission line thunder leading width calculating method based on actually measured lightning stroke data

Abstract

The invention relates to a transmission line thunder leading width calculating method based on actually measured lightning stroke data. The transmission line thunder leading width is calculated according to actually measured transmission line body lightning stroke data and thunder positioning system monitoring data. The method mainly comprises the following steps that firstly, the lightning stroke frequency and the cloud-to-ground lightning density of a transmission line body are obtained according to the transmission line body lightning stroke data and the thunder positioning system monitoring data, and secondly, the equivalent thunder leading width is calculated, wherein the computational formula of the equivalent thunder leading width is shown as d=f / rho, and d, f and rho represent the equivalent thunder leading width, the transmission line body lightning stroke frequency and the cloud-to-ground lightning density respectively. In the actual engineering application, compared with an existing method for obtaining the thunder leading width based on the empirical formula, the method has the advantage that the thunder leading width calculated based on the actually measured lightning stroke data is more reliable and accurate.

Description

technical field [0001] The method of the invention relates to the technical field of lightning protection for transmission lines, in particular to a method for calculating the lightning-induced width of a transmission line based on actually measured lightning strike data. Background technique [0002] The lightning induced width of the transmission line is one of the key parameters of the lightning protection performance evaluation model. In the traditional evaluation model, the lightning width is calculated using an empirical formula, which is equal to the sum of four times the height of the tower and the distance between the lightning conductors. In recent years, with the in-depth research on lightning physics and long air gap discharge theory, the lightning induction capacity of transmission lines is not only related to the height of towers and the spacing of lightning protection lines, but also related to factors such as topography and line structure; actual operation ex...

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Problems solved by technology

In recent years, with the in-depth research on lightning physics and long air gap discharge theory, the lightning induction capacity of transmission lines is not only related to the height of towers and the spacing of lightning protection lines, but also related to factors such as topography and line structure; actual operation experience shows that, Different terrains and landforms often have different lightning induction capabilities, especially in mountainous areas and plains. The empirical formula of lightning induction width is becoming more and more difficult to meet the actual needs of the project.

[0003] The traditional empirical calculation formula derived from the operating experience of typical low-voltage lines has been difficult to meet the needs of differential lightning protection performance evaluation, and it is urgent to propose a calculation method for the lightning induced width of transmission lines that can better reflect the actual situation

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