Double-backflushing compression combined arc extinguishing lightning protection device

Abstract

The invention discloses a double-backflushing compression combined arc extinguishing lightning protection device, which comprises a semi-closed hollow cylinder with an opening in the upper end, wherein an upper backflushing pipeline (12), a middle compression arc extinguishing pipeline (13) and a lower backflushing pipeline (14) are sequentially arranged in the semi-closed hollow cylinder from topto bottom, the bottom of the upper backflushing pipeline (12) and the top of the lower backflushing pipeline (14) are each provided with a lightning arrester (1), a plurality of compression pipes (2)are arranged in the middle compression arc extinguishing pipeline (13), and a through hole is formed in the pipe wall of the bottom of the lower backflushing pipeline (14). According to the invention, the whole device is connected to the two ends of an insulator in parallel, and the breakdown voltage of the protected insulator string is greater than that of the parallel gap, so that the parallelgap is broken down preferentially when the power transmission line is struck by lightning, and flashover of the insulator is avoided.

Description

technical field [0001] The invention belongs to the field of lightning protection devices, in particular to a double recoil compression combined arc extinguishing lightning protection device. Background technique [0002] With the continuous increase of the voltage level of transmission lines, lightning protection of transmission lines plays an increasingly important role in the entire power system. Taking into account the differences in geographical latitude, climatic conditions and topography, it is especially important to adopt lightning protection measures to reduce the lightning tripping rate of transmission lines. Nowadays, the line insulation flashover is mainly caused by the working voltage and the lightning flashover, among which the line insulation flashover caused by the lightning strike accounts for the majority, which is the main cause of the line failure. The existing lightning protection system is mainly "blocking" lightning protection mode. The main measures...

AI Technical Summary

Problems solved by technology

The existing lightning protection system is mainly "blocking" lightning protection mode. The main measures are erecting lightning protection wires and coupling ground wires, reducing grounding resistance of towers, enhancing line insulation, etc., but due to its lack of reliability and economy, it can only Protection against a single weak lightning strike, there is a huge gap in the protection against huge lightning strikes and multiple lightning strikes

The current "conductive" lightning protection mode is mainly to install parallel gaps in the insulator strings. Although its structure is simple and easy to maintain, it has many disadvantages: (1) The parallel gap has no active arc extinguishing ability, and cannot actively cut off the lightning arc. Power frequency freewheeling; (2) In exchange for the protection of the transmission line at the expense of the lightning resistance level and the tripping rate of the circuit breakers on both sides of the line, but it will affect the normal power supply of the transmission line and bring great troubles to people's lives

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