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

Abstract

A different-voltage-class subsection arc-extinguishing anti-thunder gap device comprises an arc-extinguishing device and a protective gap device which is arranged nearby an insulator chain in parallel. The protective gap device is mainly composed of a low-voltage end electrode and a high-voltage end electrode; the arc-extinguishing device comprises an arc-extinguishing cylinder and an arc-extinguishing projectile storage bin I in a disc shape, wherein a trigger coil, a trigger electrode, a projectile trigger position, arc-extinguishing projectiles and a plane scroll spring are arranged inside the arc-extinguishing projectile storage bin I; one end of the trigger electrode is connected with the trigger coil, and the other end of the trigger electrode extends to the projectile trigger position and is connected with the arc-extinguishing projectiles; the plane scroll spring is arranged at the center of the arc-extinguishing projectile storage bin I; the arc-extinguishing projectiles are arranged in a projectile storage rail of the arc-extinguishing projectile storage bin I; one end of the low-voltage end electrode is arranged on a pole and tower cross arm through a connection hardware fitting, and the other end of the low-voltage end electrode is arranged in the trigger coil of the arc-extinguishing device; one end of the high-voltage end electrode is arranged on an overhead conductor, and the other end of the high-voltage end electrode points to the low-voltage end electrode. The different-voltage-class subsection arc-extinguishing anti-thunder gap device is easy to install and replace, long in service life, and capable of greatly improving stability of an electrical power system.

Description

Technical field [0001] The invention relates to a lightning protection gap device for transmission lines, in particular to a lightning protection gap device that is suitable for various voltage levels, especially ultra-UHV transmission lines and can extinguish arcs in sections. Background technique [0002] The lightning protection of transmission lines has always been an important part of the lightning protection work of the power sector, and lightning failure is still one of the important factors affecting the safety of the power grid. Lightning strikes on the transmission line cause the line insulators to flash over, and the subsequent power frequency freewheeling damages the insulator string and fittings, causing the insulator string to burn out and the wire to break. The traditional "blocking" lightning protection method, transformation of tower grounding resistance, erection of coupled ground wire and lightning protection wire, installation of line lightning arrester, etc.,...

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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