| The research of the open space under the power frequency follow current arc characteristic and the arc of the black box model, from the arc is extinguished the basic criterion to proceed with, analysis of strong air flow under the effect of the air gap arc extinguishing mechanism, and use the MATLAB software analysis arc by a strong jet stream function form the change process. Trials using high speed camera to observe gap arc microscopic changes in the process, using oscilloscope to show gap arc voltage and current waveforms, thus to analyze the jet stream on lightning protection gap arc extinguishing effect. From the gap true arc test and theoretical simulation shows:in the open space, high pressure gas can fully Acting on the arc gap lightning protection through the power frequency follow current arc caused by its quenching.This paper developed the installation of overhead power transmission lines in the way of the jet stream arc gap lightning protection device in order to solve the problems of overhead transmission line lightning. The device can effectively protect the insulator string, can make the insulators in transmission line is hit by lightning and overvoltage from being burnt by power frequency electric arc. The jet stream arc gap lightning protection lightning flashover arc, high speed jet flow can quickly cut off with the afterflow arc, and can limit the insulator string external over-voltage, switching equipment without frequent trip, growth related equipment life.Actual overhead line installation of jet air arc gap lightning protection device operation results show, in the installation of air jet arc gap lightning protection device, transmission and distribution line lightning accident rate and the lightning trip-out rate dropped by a big margin. The device has the advantages of simple structure, convenient installation operation and maintenance, suitable for various voltage levels of power transmission and distribution system to promote the use of. |
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