Sectional extra-high-voltage composite post insulator with inner umbrella structure

Abstract

The invention relates to a sectional extra-high-voltage composite post insulator with an inner umbrella structure. The composite post insulator comprises a first composite insulator component, a second composite insulator component, a third composite insulator component and a fourth composite insulator component which are successively connected in series through flanges; each composite insulator component contains a hollow insulation pipe, and an upper flange and a lower flange which are sleeved on the both ends of the hollow insulation pipe; the glass epoxy material is wound to obtain the hollow insulation pipe; the outer umbrella prepared from high temperature vulcanized silicone rubber is formed on the outer wall of the hollow insulation pipe through overall injection; the inner wall of the hollow insulation pipe is provided with an inner umbrella which is an annular glass fibre board; and a silicone rubber layer is covered on the outer surface of the annular glass fibre board. Theinvention has the advantages of high mechanical strength, high pollution flashover resistance and convenient methods of installation and transportation.

Description

Technical field [0001] The invention relates to insulator technology for high-voltage transmission lines, in particular to a segmented UHV pillar composite insulator with an inner umbrella skirt structure. Background technique [0002] In the prior art, the post insulator is a special insulation control that supports the substation equipment in the substation and has corresponding electromechanical properties. According to different insulating materials, insulators can be divided into porcelain insulators, glass insulators and composite insulators. Among them, composite insulators are lighter in weight, excellent in anti-fouling performance, and better in mechanical strength than porcelain insulators and glass insulators. [0003] The prior art high-voltage pillar composite insulators are generally composed of a core rod, connecting fittings at both ends of the core rod, and an outer umbrella sheath. The core rod is generally a solid core rod drawn or wound with glass fiber epoxy ...

AI Technical Summary

Problems solved by technology

Among them, the glass fiber epoxy resin mandrel is used as a support to bear the mechanical load, but the diameter of the glass fiber epoxy resin mandrel cannot be enlarged arbitrarily, the mechanical strength it can bear is limited, and the inner wall is prone to conduction after moisture absorption.

Therefore, this kind of insulator has the problems of insufficient mechanical strength and poor internal insulation performance; zero point, etc., so the requirements for the leakage distance of the external insulation are very strict

In order to satisfy UHV DC transmission insulators with a sufficiently large external insulation leakage distance, a structural height that meets the requirements must be selected, so that the length of UHV DC transmission post composite insulators is basically not less than 11 meters, and the weight reaches more than 100 kg. There are many difficulties in the process of transportation, installation and maintenance

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