Elbow-shaped inserting/pulling type metal-oxide lighting arrester

Abstract

The invention discloses an elbow-type plug-pull metal oxide arrester used for AC power system over-voltage protection, comprising an elbow-type metal shell; the elbow-type metal shell is connected with a flange; the other end of the metal shell is sequentially connected with an insulated locking ring, a pressure release device, a discharge counter or charged monitor terminal, a grounding terminaland a switching wire; the other end of an insulating medium platform body is connected with a plug-pull watchband-type contact; a solid insulating medium is arranged at the inner side of the metal shell; a core body is arranged at the inner side of the solid insulating medium; the middle part of the core body is connected with a zinc oxide resistance card; and electrical glue coatings are arranged between the outer side of the insulating medium and the inner side of the metal shell, and at the lower end of the platform body. The invention improves the surface potential distribution and enhances the insulation performance, and can be easily inserted into an electrical equipment mounting hole to keep gapless intimate contact; besides, the invention is provided with good volt-ampere characteristics, small geometric dimensions and close contact of electrodes, and can keep good conductive properties and increase the overall reliability. The invention is widely used for over-voltage protection of substations, GIS combined electrical appliances and other electrical equipment.

Description

Elbow type pluggable metal oxide arrester technical field The invention relates to an overvoltage protector arrester used in a power system, in particular to an elbow-type plug-in metal oxide arrester used for overvoltage protection of electrical equipment in a power system. Background technique At present, the high-voltage electrical industry such as switches is developing towards the direction of miniaturized GIS combined electrical appliances. The traditional metal oxide arrester, whether it is a porcelain sleeve type or a silicone rubber composite sleeve type, has a high surface potential, which is likely to cause personal injury and equipment safety hazards. , Inconvenient installation and maintenance and other defects, so its use conditions and scope are subject to certain restrictions. Chinese patent ZL01265825.1 discloses a "touchable overvoltage protector" and ZL200620046285.3 discloses a "touchable metal oxide arrester". A solid insulating medium is arranged bet...

AI Technical Summary

Problems solved by technology

However, the structure, shape, geometric dimensions and certain performances of these two arresters still cannot fully meet the best requirements for the miniaturization of equipment such as GIS combined electrical appliances. Convenient, and very inconvenient for users to use discharge counters or charged monitors to monitor the arrester. The contact of the zinc oxide valve plate used in the core is not firm enough, sometimes causing defects such as poor contact

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