Aerial insulated wire lightning protection device

Abstract

An overhead insulated wire lightning protection device is characterized in that an insulator on the insulated circuit is taken as a bracket. A drainage ring is provided at the lower part of the circulation circuit, at the middle part of the insulator and the central column of the insulator. The lower end of the insulator is fixedly provided with a connecting board through a bolt. A nonlinear current limiting element is connected in series between the drainage ring and the connecting board. The drainage ring, the nonlinear current limiting element and the insulated circuit form a series gap. The device of the invention can effectively switch off the industrial frequency afterflow caused by the current of thunder. The disconnection of the overhead insulated wire caused by lightning stroke is prevented, and the generation of the accident of wire disconnection caused by lightning stroke is settled from the root.

Description

technical field [0001] The invention relates to a lightning protection device, in particular to an overvoltage lightning protection device for overhead insulated lines. Background technique [0002] A large number of overhead insulated wire lines are used in the 10kV distribution network, which effectively solves the contradiction between tree lines and line corridors. However, the statistics of lightning breakage and insulator breakdown accidents on insulated lines have been on the rise in recent years, and have risen sharply with the increase of insulated wire line length, which have become the main source of serious threats to the safe operation of lines. At present, the existing overvoltage protection devices for overhead insulated lines include zinc oxide arresters, overhead lightning arresters, etc., but they have the following problems: [0003] 1. The protection range of the zinc oxide arrester is small. If it is necessary to increase the protection range, it must b...

AI Technical Summary

Problems solved by technology

[0003] 1. The protection range of the zinc oxide arrester is small. If it is necessary to increase the protection range, it must be installed on each pole. On the one hand, the investment cost is increased, and auxiliary facilities such as cross arms need to be installed on the original line. The construction is difficult. This method has advantages for the protection of electrical equipment, but it is not suitable for use on distribution lines;

[0004] 2. Overhead lightning conductors cannot be used in 10kV power distribution network. The erection of lightning conductors must exceed the height of the original line to achieve the effect of lightning protection. However, replacing the poles to increase the height for erecting lightning conductors will greatly increase the investment cost

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