Lightning protection device

Abstract

The invention discloses a lightning protection device, which comprises an insulator and a lightning arrester body, wherein the insulator is used for supporting an overhead line; the lightning arrester body is arranged on the insulator; and after a voltage of the overhead line is higher than a threshold, an air gap is broken down, the lightning arrester body is conducted and overvoltage energy is released. The lightning arrester body comprises a base and an insulating pipe; the base sleeves the lower end of the insulator; one end of the insulating pipe is connected with the base; a plurality of chamber electrodes and a plurality of arc extinguishing chambers are sequentially arranged in the insulating pipe at intervals; and a blowhole is formed in the top end of each arc extinguishing chamber. According to the lightning protection device, an electric arc is blown off by a high-speed gas, so that a discharge arc caused by an overvoltage of the line is effectively cut off; the reliability and the safety of a power system transmission line are ensured; and meanwhile, the overvoltage of the line is indicated through an operation indicator.

Description

technical field [0001] The invention relates to the technical field of power facility components, in particular to a lightning protection device. Background technique [0002] Installing surge arresters with series gaps on overhead distribution lines can effectively discharge overvoltage and protect insulator strings from burning by discharge arcs when the lines are struck by lightning or insulator strings flashover. Ordinary surge arresters with series gaps can effectively absorb the overvoltage on the line, break down the air gap, and guide the overvoltage to the ground. However, it does not have the ability to actively extinguish the arc, and cannot automatically extinguish the power-frequency freewheeling arc caused by the breakdown of the air gap. Only when it is used in conjunction with an automatic reclosing device can a better lightning protection effect be obtained. However, due to the need to wait for the circuit breaker to operate, it takes a long time to extingu...

AI Technical Summary

Problems solved by technology

However, it does not have the ability to actively extinguish the arc, and cannot automatically extinguish the power frequency freewheeling arc caused by the breakdown of the air gap. Only when it is used in conjunction with the automatic reclosing device can a better lightning protection effect be obtained

However, due to the need to wait for the circuit breaker to operate, it takes a long time to extinguish the arc on the series gap. Every time the overvoltage on the line is released to the ground, it may cause the metal fittings to be burned by the arc, and even burn the wire in severe cases.

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