Disk-shaped multi-gap arc extinguishing and lightning protection device based on double hemisphere T-shaped ceramic discharge tube

Abstract

The invention discloses a disk-shaped multi-gap arc extinguishing lightning protection device based on a double-hemisphere T-shaped ceramic discharge tube, which relates to a lightning arrester applied to overhead lines above 10KV level. The structure of the device is as follows: 6 Ten double-hemisphere T-shaped ceramic discharge tubes are connected in series to form a series of arc-extinguishinggaps, which are arc-shaped in small segments. By 6 8 arc-extinguishing gap strings and 5 Seven outer-gap spherical electrodes are staggered in series to form a large-arc gap string, and the upper spherical electrode and the lower spherical electrode of the main gap spherical electrode are respectively connected at the ends of the large-arc gap string. The lightning current is elongated, elongated and ejected to extinguish the electric arc and reduce the counterstrike probability caused by lightning strike lightning wire. Strong ability to withstand lightning surge, large flow capacity, highsecurity; Discharge gap size consistency is good, impulse discharge, power frequency discharge is stable; The utility model has the advantages of simple structure, multiple external gaps arranged atthe same time, and the recovery speed of the dielectric insulation can be greatly improved after the lightning stroke of the device, and the dielectric insulation is not reignited after the arc is extinguished.

Description

technical field [0001] The invention relates to a lightning arrester applied to overhead lines above 10KV, in particular to a disc-shaped multi-gap arc-extinguishing lightning protection device based on double hemispherical T-shaped ceramic discharge tubes, which can prevent direct lightning strikes. Background technique [0002] Lightning is an important factor affecting the safety of transmission lines. It has long occupied the first place in line fault tripping. It is a natural process of atmospheric activity and has not been controlled so far. Lightning strikes will cause overvoltage, which may cause damage to insulators and transmission 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, protection gap arresters and new multi-gap arresters. Zinc ox...

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 protection action, and cannot effectively solve the tripping and disconnection accidents caused by lightning strikes; new multi-gap arresters are mostly used A single metal spherical electrode, the metal spherical electrode is ablated by the power frequency arc for many times and is easy to melt and change, resulting in a short circuit between the gaps, and the arc extinguishing gap series is in a relatively closed space. Difficult to recover, easy to reignite the arc

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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