Jet Parallel Gap Device

Abstract

The invention discloses a gas injection type parallel gap device. The protection device belongs to the field of lightening protection gap for power transmission lines of alternating-current and direct-current electric power systems. The device is connected with the two ends of a power transmission line insulator chain in parallel, under a lightening stroke, the device is broken down before the insulator chain can be broken down, and thus the insulator chain and the corresponding power transmission line can be protected; moreover, a high-speed high-voltage gas flow can be generated fast and acts on arcs to restrain formation and development of the arcs, the arcs are extinguished in a transient state, and thus the lightning trip-out rate and the lightening accident rate of an electric power system are reduced. The gas injection type parallel gap device comprises arc-control devices on the grounding side and the wire side, fixing devices and parallel spiral fittings installed at the two ends of the insulator train of the line. The arc-control device on the grounding side and the arc-control device on the wire side respectively comprise an arc extinguishing powder storage chamber, an arc air-termination ring, an insulating gas generation chamber, an arc spray channel and the like. With the device, the stability of the electric power system is improved, the on-load action frequency of a breaker is effectively reduced, the service life of electric power equipment such as a transformer is prolonged, and production, operation and maintenance cost is very low.

Description

technical field [0001] The invention relates to a gas arc extinguishing lightning protection device, in particular to a gas jet parallel gap device. 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. The impact flashover caused by lightning strike on the transmission line will cause the flashover of the line insulator, and then generate a large power frequency continuous current, damage the insulator string and fittings, and cause the line disconnection accident. The traditional "blocking" lightning protection method cannot fundamentally solve the lightning strike problem due to its limitations. Therefore, the power sector generally adopts the installation of parallel protection gaps or line arresters on the transmission line to realize the protection line. However, ...

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Problems solved by technology

[0004] Secondly, the line arrester is expensive, the use and maintenance costs are high, the leakage current is large, the service life is short, and the replacement is frequent, and the zinc oxide module used in the line arrester has obvious skin effect under lightning impact, and it is easy to explode under high current. Cause long-term failure of the line, which is not conducive to the economical, safe and stable operation of the power grid

[0005] Finally, lightning short-circuit accidents caused a sharp increase in the number of load-loaded circuit breakers, which not only shortened the life of the circuit breaker, but also threatened other important power equipment such as transformers.

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