Alternate-current disc suspension type bell-shaped ceramic compound insulator special for 420KN

Abstract

The invention discloses an alternate-current disc suspension type bell-shaped ceramic compound insulator special for 420KN. The insulator comprises a steel cap, a ceramic disc, a groove and a steel pin. The diameter of the insulator is of 400mm, the creepage distance is of 550mm, and the ceramic disc and the groove are coated with vulcanized silicone rubber with the thickness of 6mm. Since the 6mm external insulating component is formed on the surface of an insulator body in a vulcanized manner, the steep wave resistance of the insulator is improved greatly, and the ceramic compound insulator is capable of passing a test of 2.85 times of negative lightning impulse voltage by the amplitude method; according to an artificial contamination test, the insulator has fine contamination resistance under IV stage contamination, and the contamination flashover resistance of the insulator is at least 1.8 times of that of a disc suspension type bell-shaped ceramic insulator on the conditions of consistent salt deposit density and dust deposit density.

Description

technical field [0001] The invention belongs to the technical field of disc-shaped suspension insulators, in particular to an AC disc-shaped suspension bell jar-shaped porcelain composite insulator specially used for 420KN. Background technique [0002] At present, when the transmission lines of many provinces and cities in China, especially the northern provinces and cities, encounter weather conditions such as freezing rain and snowmelt in winter, the vertically suspended insulator strings will be bridged by icicles, and the insulation strength of the bridged insulator strings will be greatly reduced. , prone to flashover accidents. [0003] In order to prevent insulator strings from being bridged by ice skating, people have developed multiple directions of insulator technology. Among them, improving the wave-shaking tolerance and pollution resistance of insulators has become a main direction in people's research. Contents of the invention [0004] The purpose of the pr...

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Problems solved by technology

[0002] At present, when the transmission lines of many provinces and cities in China, especially the northern provinces and cities, encounter weather conditions such as freezing rain and snowmelt in winter, the vertically suspended insulator strings will be bridged by ice skating, and the insulation strength of the bridged insulator strings will be greatly reduced. , prone to flashover accidents

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