Touchable pluggable arrester

Abstract

The invention discloses a tangible plug type lightning arrester comprising a cylindrical piezoresistor core, the cylindrical piezoresistor core is enwrapped with annular inner insulation medium, annular semiconductor or conductor, and annular outer insulation medium in sequence, the upper end of the cylindrical piezoresistor core is matched and connected with a plug type joint, the lower end of the annular outer insulation medium is fixedly connected with an annular base, the lower end of the inner wall of the annular base is provided with an annular step, a pressure release channel is formed between the cylindrical piezoresistor core and the annular base, the lower port of the pressure release channel is provided with an annular sheet which is provided with an open pore, a grounding terminal penetrates through the open pore to extend into the pressure release channel and fixedly connected with the bottom end of the cylindrical piezoresistor core; the annular outer insulation medium and the annular base are enwrapped with annular metal jacket. When in use, the shell of the invention has no hazards, the invention has high potential, is tangible, is convenient to install and maintain, is free from electromagnetic field interference, has high reliability, long service life and low cost, and can fully meet the special use requirements of compact electrical equipment such as aeration switch cabinet and the like.

Description

technical field [0001] The invention relates to the field of surge arresters for overvoltage protection, in particular to a touchable and pluggable surge arrester specially used for protecting gas-filled insulating high-voltage electrical equipment. Background technique [0002] Lightning arresters generally used for insulation protection mainly use traditional ceramic jackets or composite silicone rubber jackets. When installing and using, one end of the product is grounded and the other end is connected to the high-voltage end. The disadvantage is that the surface electric field strength is very high during use, which is likely to endanger personal safety. At the same time, installation and maintenance are inconvenient. In addition, the external insulation structure adopted is too simple, and surface discharge phenomenon is prone to occur in hot, humid and dirty environments, and accidents due to external insulation damage occur from time to time. The scope of use of the p...

AI Technical Summary

Problems solved by technology

[0002] Lightning arresters generally used for insulation protection mainly use traditional ceramic jackets or composite silicone rubber jackets. When installing and using, one end of the product is grounded and the other end is connected to the high-voltage end. The disadvantage is that the surface electric field strength is very high during use, which is likely to endanger personal safety. At the same time, it is inconvenient to install and maintain. In addition, the external insulation structure adopted is too simple, which is prone to surface discharge in hot, humid and dirty environments, and accidents due to external insulation damage occur from time to time.

The scope of use of the product is subject to certain restrictions

Especially in recent years, with the rapid development of gas-filled switchgear, it is difficult for traditional lightning arresters to meet its installation and use requirements.

[0003] Chinese patents ZL01265825.1 and ZL200620046285.3 disclose such a touchable arrester. The arrester is connected with a high-voltage end and a low-voltage end. A solid insulating medium is provided between the core and the shell made of conductor material, and a grounding The front end of the insulating medium is a plug connector, which basically realizes the touchable function. However, the safety of the outer insulation of the arrester with this structure only depends on a layer of solid medium, and there are still defects of low reliability.

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