Liquid recoil arc extinguishing lightning protection device

Abstract

The invention discloses a liquid recoil arc extinguishing lightning protection device, and belongs to the technical field of arc extinguishing lightning protection. The device comprises a recoil pipe, a conductor is arranged at the bottom of the recoil pipe and connected to the ground, and liquid is arranged in the recoil pipe. Liquid is placed in the back-flushing pipe, when an electric arc enters the back-flushing pipe, the lightning arc impact time is extremely short at the moment that the electric arc pre-breaks through the liquid, the liquid cannot be deformed and displaced instantly, and the liquid-electric detonation effect and the back-flushing arc extinguishing pressure peak value are synchronous with the impact gradient electric arc pre-breakdown time; after the liquid is conducted by the electric arc, the electric arc and the liquid are subjected to heat exchange to generate an electro-hydraulic heat exchange effect, kinetic energy is stored through liquid bubbles generated by electric arc heat and a thermal evaporation effect, and downward shock waves generated by a hydraulic-electric detonation effect and the electro-hydraulic heat exchange effect are reflected back by the bottom of the recoil pipe to form a shock wave regular reflection effect for arc extinguishing. The arc is cut off early, the recoil arc extinguishing pressure peak value is synchronous with the impact large-gradient arc pre-breakdown time, and the impact arc is cut off immediately when the impact arc is just formed.

Description

technical field [0001] The invention relates to the technical field of arc extinguishing and lightning protection, in particular to a liquid recoil arc extinguishing and lightning protection device. Background technique [0002] Lightning strikes will bring different forms of damage and destruction to power facilities, and thundercloud discharge will cause lightning strike overvoltage in the power system. Lightning overvoltage may cause damage to insulators and transmission lines; the impact flashover caused by lightning strikes on transmission lines will cause flashover of line insulators, and then generate a large power frequency continuous current, damage insulator strings and fittings, and cause line accidents; Electric shock on the transmission line or lightning protection line may cause broken strands or even rupture, making the power transmission work impossible. [0003] The gas recoil arc extinguishing device can effectively reduce the lightning current and make th...

AI Technical Summary

Problems solved by technology

Lightning overvoltage may cause damage to insulators and transmission lines; the impact flashover caused by lightning strikes on transmission lines will cause flashover of line insulators, and then generate a large power frequency continuous current, damage insulator strings and fittings, and cause line accidents; Electric shock on the transmission line or lightning protection line may cause broken strands or even rupture, making the power transmission work impossible

[0003]The gas recoil arc extinguishing device can effectively reduce the lightning current and make the volt-second characteristic of the active arc extinguishing parallel gap more flat, but the existing gas recoil The recoil pressure of the arc extinguishing device is low, which can only reduce the steepness of the wave head of the lightning current, and cannot further attenuate the amplitude of the lightning current. The attenuation rate of the lightning current is low, and the arc current interception capability is not large enough.

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