Distribution line lightning protection device

Abstract

The invention provides a lightning arrester of a power distribution line. One end of the lightning arresting hopper line is connected with a metal fixed plate. The other end of the lightning arresting hopper line and a lightning arresting line body are fixedly connected with a pull line via a suspension line. Multiple lightening receiving needles are arranged on the metal fixed plate. A tower top is arranged on the top end of a tension resisting rod. The metal fixed plate is fixed on the top end of the tower top via an insulation piece. By adjusting the insulation piece, height of the metal fixed plate can be adjusted, so interval impedance of an air interval formed between the lightning arresting hopper line and the tower top is easily adjusted and angles of lightening receiving needles can be adjusted. According to the invention, interval impedance can be effectively adjusted; proper interval impedance can be chosen according to different demands on actual terrain or climate; the interval impedance can be adjusted quite easily; during installation of the lightning arresting device, the lightning receiving needles can be adjusted according to actual demands; effective performance of a 0.4KV power distribution line lightning arrester is improved; trip-out rate is reduced; and reliable operation of the power distribution line is ensured.

Description

technical field [0001] The invention relates to the technical field of lightning protection auxiliary equipment for electric power equipment, in particular to a lightning protection device for power distribution lines, which belongs to the technical field of electric power equipment. Background technique [0002] Lightning accidents on overhead transmission lines account for a large proportion of power system accidents. It has many adverse effects, for example, accident tripping affects the normal power supply of the system; overvoltage waves invade the substation along the line, and endanger the insulation of electrical equipment in the substation. Therefore, it is very important to determine the specific lightning protection measures for the line: it is very important for the transmission line to carry out the lightning protection design according to the voltage level of the circuit, the nature of the load, and the operation mode of the system. The operation experience of...

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Problems solved by technology

[0003] However, the specifications of lightning protection devices for current distribution lines are basically fixed, especially for 0.4KV transmission lines. Lightning protection devices, with different effects, affect the trip rate

Although the current lightning protection device is relatively simple, it cannot adjust the structure, which is likely to cause a high tripping rate and affect the impact of power transmission. Although a small number of lightning protection devices start to set gap impedance for lightning protection design, due to the influence of region and climate, it cannot be based on actual conditions. The region or climate adjusts the lightning protection device of the distribution line, which affects the probability of tripping of the transmission line during lightning protection, and cannot meet the higher performance requirements of the distribution line

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