Three-state combined arc extinguishing device and arc extinguishing method

Abstract

The invention provides a three-state combined arc extinguishing device and an arc extinguishing method, and belongs to the technical field of lightning protection and arc extinguishment, the three-state combined arc extinguishing device comprises an insulating pipe sleeve, a skirt edge, an arc striking cover body, a liquid valve plate, a zinc oxide valve plate, a recoil pipe and a screw rod, the skirt edge is arranged on the outer side of the insulating pipe sleeve, the recoil pipe is arranged at the upper end of the liquid valve plate, the zinc oxide valve plate is arranged at the bottom end of the liquid valve plate, and the screw rod is arranged in the skirt edge. The insulating pipe sleeve wraps the outer ends of the liquid valve plate, the zinc oxide valve plate and the recoil pipe, the screw rod is arranged at the bottom end of the insulating pipe sleeve, the top end of the recoil pipe is exposed out of the top end of the insulating pipe sleeve, and the arc striking cover body covers the top ends of the recoil pipe and the insulating pipe sleeve. Three defensive lines for impact current attenuation and three defensive lines for pairwise voltage division are formed, the reignition voltage of each stage is reduced, the capacity of cutting off electric arcs is improved through a body and a gas medium, the current gradient is slowed down, the through-flow area and the through-flow limit capacity of the valve plate are improved, the medium and the gas medium replace original conductive metal, the valve plate is safer and cleaner, and the service life of the valve plate is prolonged. And carbon emission can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of lightning protection and arc extinguishing, in particular to a three-state combined arc extinguishing device and an arc extinguishing method. Background technique [0002] The zinc oxide arrester is installed and used in parallel with the line insulator (series), which can effectively reduce the accident rate of lightning flashover and trip, and improve the lightning resistance level of AC overhead transmission lines. But the existing zinc oxide arrester has the following problems: [0003] 1. The zinc oxide arrester is affected by the impulse voltage, and the valve plate will also age under the action of the impulse voltage energy. [0004] 2. Because the zinc oxide arrester cancels the series gap, under the action of the operating voltage of the power grid, the body must flow current, and the active component in the current will make the zinc oxide valve plate heat up, which will cause the change of th...

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Problems solved by technology

[0003] 1. The zinc oxide arrester is affected by the impact voltage, and the valve plate will also age under the action of the impact voltage energy

[0004] 2. Since the zinc oxide arrester cancels the series gap, under the action of the grid operating voltage, its body needs to flow current, and the active component in the current will make the zinc oxide valve piece heat, which in turn will cause a change in volt-ampere characteristics. This is a positive The feedback process and the long-term effect will lead to the aging of the zinc oxide valve plate, and even thermal breakdown

[0005] 3. Moisture inside the zinc oxide arrester or poor insulation performance of the insulating bracket will increase the power frequency current, increase power consumption, and cause internal discharge in severe cases

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