Lightning protection device with combination of multigap driven arc extinguishing and driving arc extinguishing by multipoint strong airflow

Abstract

The invention relates to a lightning protection device, in particular to a lightning protection device with combination of multigap driven arc extinguishing and driving arc extinguishing by multipoint strong airflow, which is used for power transmission lines with all voltage grades. The lightning protection device is arranged on all iron caps of a line insulator string in parallel, a main discharging gap and a multigap driven arc extinguishing unit are connected in series, and the total flashover voltage is less than that of the protected insulator string, so that when the lines are struck by lightning, a product is punctured prior to the protected insulator string. A signal acquisition device acquires lightning current signals automatically and starts a gas generation device, so that high-speed air flow is generated instantaneously in a semi-enclosed space and extinguishes the arcs; and in the multigap driven arc extinguishing unit, air is rapidly heated by high-temperature arcs andexpands, lengthens the arcs quickly and sprays out the arcs from air-guiding holes so as to extinguish the arcs. According to the lightning protection device, the structure is simple, the installation is convenient, and when the line is struck by the lightning, lightning current can be leaked into the ground quickly, and simultaneously the high-speed airflow is generated to extinguish power-flow current, so that electrical equipment is effectively protected and the power supply reliability is improved.

Description

technical field [0001] The invention relates to a lightning protection device, in particular to a multi-gap passive composite multi-point strong airflow active arc extinguishing lightning protection device for power transmission lines of various voltage levels. 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 line insulator to flash over, and then generate a large power frequency continuous current, damage the insulator string and fittings, and cause a line 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 protect...

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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

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