Lightning protection supporting column insulator capable of enlarging discharge gap by elastic conductive coil

Abstract

The invention discloses a lightning protection supporting column insulator capable of enlarging discharge gap by an elastic conductive coil. The lightning protection supporting column insulator comprises an insulator, an upper discharge part and a lower discharge part; a sealing cavity is formed in the insulator; the upper discharge part has an upper discharge end on the upper part of the sealingcavity; the lower discharge part comprises a lower discharge rod with a lower discharge end, an insulating sliding pipe, a core rod glidingly arranged in the insulating sliding pipe, an insulation connecting piece used for connecting the lower discharge rod and the core rod in an insulating manner, the elastic conductive coil arranged on the insulating sliding pipe in a sleeving manner and used for generating electromagnetic force, a conductive mounting base and a conductive mounting supporting column; the upper end of the elastic conductive coil is fixedly connected with the lower discharge rod while the lower end of the elastic conductive coil is fixedly arranged on the conductive mounting base; and a discharge gap is formed between the upper discharge end of the upper discharge part andthe lower discharge end of the lower discharge rod. By virtue of the elastic conductive coil, electromagnetic force can be generated to drive the core rod and the lower discharge part to move downwardly to enlarge the discharge gap instantaneously; and in addition, reset elasticity can be provided for the lower discharge part, so that the initial position can be recovered after downward movement.

Description

technical field [0001] The invention belongs to the technical field of lightning strike protection for electric overhead insulated lines, and in particular relates to a lightning protection post insulator which uses elastic conductive coils to increase discharge gaps. Background technique [0002] After the overhead line is struck by lightning, power frequency freewheeling will occur. The so-called power frequency freewheeling means that after the overhead line is struck by lightning, a lightning arc will be generated between the overhead line and the metal cross arm. The survival time of this lightning arc is very short, but it forms The conductive channel between the overhead line and the cross-arm is opened, so that the power supply of the overhead line is short-circuited to the ground (cross-arm). In terms of freewheeling, the greater the grounding resistance of the crossarm or pole, the smaller the power frequency freewheeling, and the easier it is to cut off the curren...

AI Technical Summary

Problems solved by technology

[0005] However, this kind of lightning protection post insulator still has the following disadvantages: the discharge point of the arc striker and the lower steel foot is exposed, and it is easy to accumulate dirt, which affects the discharge action

In addition, the discharge gap between the arc striker and the lower steel foot is fixed, but the external weather changes frequently, which may easily lead to misoperation or discharge failure.

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