Combined lightning arrester based on disc-shaped multi-gap arc extinguishing and lightning protection device

Abstract

The invention discloses a combined type lightning arrester based on a disc-shaped multi-gap arc extinguishing and lightning protection device, in particular to a lightning arrester applied to overheadlines above 10KV. The structure of the invention is as follows: upper and lower connecting fittings are respectively arranged on the upper and lower parts of the insulating support rod, the upper spherical electrode is connected with the upper connecting fittings, the lower spherical electrode is connected with the lower connecting fittings, a first, second,.. N-th disk-shaped multi-gap arc extinguishing lightning protection device is serially connected between the upper connecting fittings and the lower connecting fittings, N is a natural number, 1 <= N <= 8. The lightning current is elongated, elongated and ejected to extinguish the electric arc, thereby avoiding the occurrence of inter-phase short circuit fault and reducing the counterattack probability caused by lightning strike lightning protection wire; and the lightning current is elongated, elongated and ejected. Strong ability to withstand lightning surge, large flow capacity, high security; Good consistency of discharge gapsize; Simple structure; The special multi-gap arc will not be reignited because of the rapid recovery of dielectric insulation after the power frequency continues to flow through the zero-extinguishing arc.

Description

technical field [0001] The invention relates to a lightning arrester applied to an overhead line with a level of above 10KV, in particular to a combined lightning arrester based on a disc-shaped multi-gap arc extinguishing lightning protection device, which can prevent direct lightning strikes. Background technique [0002] Lightning is an important factor affecting the safety of power transmission lines, and it has long been the first place in line fault tripping. Lightning strike will cause overvoltage, which may cause damage to insulators and power lines; cause flashover discharge of insulators. In this regard, the power sector generally adopts the installation of line lightning arresters on overhead lines to achieve protection. At present, the line arresters used on overhead lines mainly include: zinc oxide arresters, protective gap arresters and new multi-gap arresters. Zinc oxide arresters are susceptible to moisture, aging, high failure rate and difficult maintenanc...

AI Technical Summary

Problems solved by technology

Zinc oxide arresters are susceptible to moisture, aging, high failure rate, and difficult to repair and maintain; protective gap arresters cannot extinguish the arc after lightning strike protection action, and cannot effectively solve the tripping and disconnection accidents caused by lightning strikes; new multi-gap arresters mostly use a single Metal spherical electrodes, metal spherical electrodes are ablated by power frequency arcs for many times and are easy to melt and change, resulting in short-circuit between gaps, and the arc extinguishing gap series is in a relatively closed space. recovery, the arc is prone to reignite

At the same time, the structure is complex, the production is difficult, the product consistency is poor, and the power frequency discharge and impact discharge are unstable

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