Mechanical structure of ultra high voltage DC arrester

Abstract

The invention discloses a mechanical structure of an ultra high voltage DC arrester. The mechanical structure comprises a plurality of arrester elements connected in series with one another and anti-corona devices arranged at the top ends of the arrester elements, wherein the arrester element comprises an arrester core body and a weatherproof umbrella cover sleeved outside the arrester core body;an enhanced mechanical structure is formed between the arrester core body and the weatherproof umbrella cover, and is a composite outer sleeve arranged between the arrester core body and the weatherproof umbrella sleeve; a plurality of insulating rods are axially arranged along the arrester core body on the inner wall of an insulating cylinder of the composite outer sleeve; and a plurality of support rings are radially arranged along the arrester core body. The mechanical structure can meet the requirements of strong mechanical strength and high shock resistance level of the ultra high voltage DC arrester, limit the radial displacement of the top end of the arrester under the action of a horizontal force of a conductor, wind power and a seismic force, enhance the strength and rigidity of the composite outer sleeve and ensure the stability of the support structures and core body structure of the arrester as well as the safe running of the arrester.

Description

technical field [0001] The invention relates to a mechanical structure of a lightning arrester for UHV DC system protection, in particular to a mechanical structure of a DC lightning arrester for UHV DC busbar protection. Background technique [0002] The UHV DC surge arrester is an important overvoltage protection device for various electrical equipment in the UHV DC transmission system. It is connected in parallel next to the protected electrical equipment to prevent the protected electrical equipment from being damaged by lightning and operating overvoltage. [0003] In the UHV DC transmission project, because the height of the arrester exceeds 15 meters, its mechanical strength and seismic strength are high, and the current composite jacket structure cannot meet the requirements, and the manufacturing process of the composite jacket limits the further improvement of the composite jacket. The rigidity and strength of the jacket, and its deflection have exceeded the allowa...

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Problems solved by technology

[0003] In the UHV DC transmission project, because the height of the arrester exceeds 15 meters, its mechanical strength and seismic strength are high, and the current composite jacket structure cannot meet the requirements, and the manufacturing process of the composite jacket limits the further improvement of the composite jacket. The rigidity and strength of the jacket, its deflection has exceeded the allowable value of the arrester, and the structure of the UHV DC arrester with a single jacket cannot be realized, which affects the safe operation and mechanical strength of the UHV arrester

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