Lightning arrestor

Abstract

A lightning arrestor is obtained, which is excellent in pressure relief performance and can be reduced in manufacturing cost while securing bending strength necessary for a lightning arrestor. A plurality of eaves-trough-like insulators 2 having arcuate sections enclosing zinc oxide elements 1 are arranged around the zinc oxide elements 1 to form a common cylindrical construct TA enclosing the zinc oxide elements 1 , and the plurality of eaves-trough-like insulators 2 are provided with a predetermined interval to one another in a circumferential direction of the cylindrical construct TA, and both ends of the plurality of eaves-trough-like insulators 2 are fixed to terminal portions 6 A, 6 B provided at both ends of the zinc oxide elements 1 , respectively.

Description

technical field [0001] The present invention relates to a lightning arrester, in particular to lamination of a plurality of zinc oxide elements used for protection against abnormal voltages such as switching surges and lightning surges generated on circuits of electrical equipment connected to a power system, and The lightning arrester is covered with an insulating member such as silicon rubber or polymer as an outer covering and covers the periphery of the zinc oxide element. Background technique [0002] Conventional structures in which an insulating member having an insulating material such as silicone rubber or polymer is used as an arrester covering the periphery of a zinc oxide element can be broadly classified into two types. That is, the structure in which the zinc oxide element is covered with an insulating cylinder (for example, refer to Patent Document 1 and Patent Document 2) and the structure in which several plate-shaped insulators (such as FRP, etc.) are arran...

AI Technical Summary

Problems solved by technology

[0007] In the case of the insulating cylinder method, the mechanical strength against bending used as a lightning arrester is high, and when the internal pressure of the lightning arrester is released, the pressure applied to the inner surface of the insulating cylinder is released from the hole provided on the outer peripheral surface of the insulating cylinder. Lightweight, can prevent explosive scattering, and has good pressure release performance, but due to the complicated shape processing of the insulating cylinder, its disadvantage is that the manufacturing cost is high

In particular, since the manufacturing cost depends on the thickness of the insulating cylinder, if the thickness of the insulating cylinder is excessively increased in order to improve the mechanical strength or the pressure release performance, there is a problem that the manufacturing cost of the insulating cylinder itself becomes very high

[0009] In this way, regardless of the insulating cylinder method or the insulating plate method, although there is an advantage in both mechanical strength and manufacturing cost, if the two conditions of improving the mechanical strength and reducing the manufacturing cost are satisfied at the same time, then is difficult

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