Explosion-proof automatic-separation type lightning arrester

Abstract

The invention discloses an explosion-proof automatic-separation type lightning arrester comprising an insulating cylinder and a silastic jacket, wherein the insulating cylinder is internally provided with a plurality of layers of fixed zinc oxide valve sheets; the lower end of the insulating cylinder is provided with grounding wires conductively connected with the zinc oxide valve sheets; a radiating ventilation groove is arranged around the zinc oxide valve sheets; the lower end of the insulating cylinder is fixed with an explosion-proof separation cover in a sealing way; the inner side of the explosion-proof separation cover in the insulating cylinder is provided with a chemical material part and a hot melt separation part; the end surface of the explosion-proof separation cover is provided with a safety groove communicated with the radiating ventilation groove; and internal flashover generated due to the strong thunder or high-pressure gases generated by violent reaction when the chemical material is heated causes the safety groove to break, thus leading the explosion-proof separation cover to being separated from the insulating cylinder. The explosion-proof automatic-separation type lightning arrester has good separation reliability, the reliable separation not only can be realized under the conditions of aging of the metal oxide arrester and slowly increasing of leakage current, but also can be realized under the condition of internal flashover damage when the lightning arrester is impacted by the strong thunder, and comminuted explosion and permanent ground fault do not occur, thus ensuring the normal operation of electric power systems.

Description

technical field [0001] The invention relates to a lightning arrester, in particular to a high-voltage explosion-proof automatic disengagement type lightning arrester. Background technique [0002] At present, the power system has higher and higher requirements for the quality of overvoltage protection products. Overvoltage protection products are mainly arresters. Because the protection function of the arrester itself is not very ideal, failures and damage to power transmission and transformation equipment caused by arresters often occur in the power system. Accidents and failures have a great impact. Among them, because the arrester pressure release device does not work or the disconnection device does not work, the power failure loss caused by the power failure accounts for a large proportion. Therefore, how can the arrester be damaged under the condition of strong lightning current and operating overvoltage current? It can be reliably separated from the power system to e...

AI Technical Summary

Problems solved by technology

However, the above two disconnectors may fail to disengage reliably. Once they fail to operate reliably, it will cause a crushing explosion of the arrester or a permanent grounding accident of the power system, and the above two disconnectors can only be used for metal oxide arresters. In the case of aging and leakage current gradually increasing, if internal flashover damage occurs due to strong lightning impact, there is nothing to be done, and all problems in the operation of the arrester have not been completely solved. Moreover, most disconnectors are used in series with the arrester. Connected in series outside the arrester, the heat transfer is slow, the heat transfer effect is poor, and the reliability is more unstable

Generally speaking, the existing disconnectors have some reliability problems, and they can only function under certain conditions, and there are certain limitations in their use

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