Different-voltage-class subsection arc-extinguishing anti-thunder gap device

Abstract

A lightning protection gap device for segmental arc extinguishing at different voltage classes, comprising an arc extinguishing device and a gap protection device which is installed side by side near an insulator string, wherein the gap protection device is mainly composed of a low-voltage side electrode and a high-voltage side electrode; and the arc extinguishing device comprises an arc extinguishing canister and a disc-shaped arc extinguishing bomb-storage warehouse (I), and the arc extinguishing bomb-storage warehouse (I) is provided with a trigger coil, a trigger electrode, a bullet trigger position, arc extinguishing bullets and a flat spiral spring therein. One end of the trigger electrode is connected to the trigger coil, and the other end thereof is extended to the bullet trigger position and is connected to the arc extinguishing bullets; the flat spiral spring is installed at a center position of the arc extinguishing bomb-storage warehouse (I); the arc extinguishing bullets are arranged in a bomb-storage track of the arc extinguishing bomb-storage warehouse (I); one end of the low-voltage side electrode is installed on a tower cross arm by connecting metal fittings, and the other end thereof is installed in the trigger coil of the arc extinguishing device; and one end of the high-voltage side electrode is installed on an overhead conductor, and the other end thereof points to the low-voltage side electrode. The device has the advantages of easy installation and replacement and long service life, and can improve the stability of a power system substantially.

Description

technical field [0001] The invention relates to a lightning protection protection gap device for transmission lines, in particular to a lightning protection gap device suitable for various voltage levels, especially ultra-high voltage transmission lines, and capable of extinguishing arcs in sections. Background technique [0002] Lightning protection of transmission lines has always been an important part of the lightning protection work of the power sector, and lightning faults are still one of the important factors affecting the safety of the power grid. Lightning strikes on transmission lines cause flashover of line insulators, and the resulting power frequency freewheeling damages insulator strings and fittings, resulting in burnt insulator strings and wire burnout accidents. The traditional "blocking" lightning protection methods, such as transforming the grounding resistance of towers, erecting coupling ground wires and lightning arresters, and installing line arrester...

AI Technical Summary

Problems solved by technology

The patent applied by the inventor before has played a very good role in extinguishing the power frequency arc, but there are still some shortcomings: 1. The connecting hardware of the high and low voltage end electrodes is installed at both ends of the insulator string; because the insulator string is installed on the edge of the tower, artificial installation 1. Maintenance is very difficult, and it is easy to cause the distance of the main gap to be inconsistent with the set value; in addition, the power frequency arc caused by the gap is very close to the insulator string, which is easy to burn the insulator string and cause a disconnection accident at the line clip; 2. The previous patented devices are all It is a section of arc extinguishing, which is completely suitable for the voltage level of 110kV and below, but for the voltage level of 220kV and above, the length of the insulator string is very long, the ability of the section of arc extinguishing device is effective, and it is easy to cause re-ignition; 3. The previous patented device is installed on the insulator The two ends of the string are close to the overhead wires, and the live replacement operation cannot be realized; 4. The first-stage arc extinguishing device has a small bullet capacity and a short service life, which increases the workload of replacement and maintenance

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