Method for calculating lightning strike shielding effect between adjacent transmission lines

Abstract

The invention discloses a method for calculating a lightning strike shielding effect between adjacent transmission lines. The method includes the steps of firstly obtaining the lightning damage statusand line and tower parameters of a region where an important transmission channel is located, and determining electrical geometric parameters and lightning related parameters for the use in simulation calculation; then on the basis of an improved EGM model, establishing a simulation model for two or more, extra-high voltage or ultra-high voltage, AC or DC, and single-circuit or multi-circuit lines set up in parallel in the important transmission channel, determining a mutual positional relationship of phase conductor arcs of the lines, calculating projection widths of the arcs at different lightning current amplitudes and different lightning incident angles, determining the projection priority of each arc at the same time, then calculating the lightning bypassing rate of each phase conductor of each line considering a shielding effect, and introducing a lightning shielding factor to quantitatively evaluate the lightning strike shielding relationship between the different lines. The method in the invention is applicable to the calculation of the lightning strike shielding effect between the adjacent lines in the important transmission channel, and provides a basis for the evaluation of the lightning damage to the lines and the line reconstruction in the important transmission channel.

Description

technical field [0001] The invention relates to the technical field of lightning damage level evaluation and protection of transmission lines, and more specifically relates to a calculation method for lightning strike shielding effect between adjacent transmission lines. Background technique [0002] In recent years, with the rapid construction of important transmission lines such as ultra-high voltage lines, important load power supply lines, large-scale power transmission lines, cross-regional networking and transnational lines, and the shortage of land resources, the available line corridors are decreasing, and my country's power grid has gradually formed. Some transmission channels with large transmission capacity and closely arranged lines have been established. Most of the channels are composed of two or more important transmission lines. The distance between the centers of adjacent lines does not exceed 600 meters. There may be great differences between the channel and ...

AI Technical Summary

Problems solved by technology

Combining the above methods, domestic relevant units have carried out some studies on the lightning shielding performance and shielding calculation of transmission lines, but most of the research focuses on the lightning shielding of "ground wire-conductor" and "conductor-conductor" of a single transmission line. Performance analysis, no systematic studies have been conducted on mutual lightning shielding performance between adjacent transmission lines

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