Full-coverage-type lightning protection device for overhead transmission lines

Abstract

A full-coverage-type lightning protection device for overhead transmission lines comprises three lightning conductors which are arranged above the transmission lines and are parallel to the transmission lines. The middle lightning conductor is located over the middle transmission line, and the left lightning conductor and the right lightning conductor are symmetrically arranged in a left-right mode, wherein the protection angle alpha between the left lightning conductor and the left transmission line is 0 degree. The lightning protection for the three-phase transmission lines by the full-coverage-type lightning protection device is free of dead corners and more comprehensive. Besides, the full-coverage-type lightning protection device has the advantages of being low in improvement cost, convenient to construct and more reliable in lightning protection.

Description

technical field [0001] The invention relates to a lightning protection device, in particular to an improved and full-coverage lightning protection device for overhead power transmission lines. Background technique [0002] Thundercloud discharge causes lightning overvoltage in the power system, or atmospheric overvoltage. [0003] There are two common overvoltages in overhead lines: the first is the overvoltage caused by lightning strikes near the overhead lines, and the overvoltage on the transmission line through electromagnetic induction; the second is the overvoltage generated by lightning directly hitting the wires. There are three specific situations: [0004] 1. Lightning strikes the top of the tower; 2. Lightning strikes the space part of the lightning conductor; 3. Bypassing the lightning conductor and striking the conductor. [0005] Lightning strike faults are divided into two types according to their nature: [0006] 1) Recoverable: after the lightning flashov...

AI Technical Summary

Problems solved by technology

[0031] The existing lightning protection methods still have defects, such as improper size matching, etc., which still cannot meet the needs of lightning protection

[0033] 1. Phase A and Phase C are within the protection angle of 25°lightning conductors, while phase B is covered by the intersection of lightning conductors, but strictly observed, it is outside the protection angle;

[0034] 2. In high mountains and rivers and lakes, power poles and towers often have large spans, heavy sag of transmission lines, and the largest swing with the wind. The wires are usually within the protection angle, but they may exceed the protection range under strong winds;

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