Inflatable extra-high voltage direct current through-the-wall bushing

Abstract

The invention discloses an inflatable extra-high voltage direct current through-the-wall bushing comprising an insulation sleeve and a central conductor penetrating the insulation sleeve. One end of the central conductor is fixedly connected with an outdoor side sleeve pipe end cover on one side of the insulation sleeve, and the other end is connected with a T-shaped bellows end cover on the other side of the insulation sleeve in a sealed manner. A stretching device is disposed between the bellows end cover and the central conductor, which are cooperated with each to perform the single-side stretching on the central conductor. The inflatable extra-high voltage direct current through-the-wall bushing has advantages of simple structure, strong discharge capability, reliable performance, and ability of facilitating safe and stable operation of direct current power transmission system.

Description

【Technical field】 [0001] The invention belongs to the technical field of electrical engineering, in particular to an inflatable UHV DC wall bushing. 【Background technique】 [0002] Due to its advantages, high-voltage direct current transmission technology has many advantages such as small line loss, low line cost, reliable operation, strong system stability, suitable for long-distance large-capacity power transmission, and relatively easy to realize interconnection between asynchronous power grids. And more and more favored by the power industry, especially in the aspects of long-distance grid connection, cross-sea power transmission and large-capacity power transmission, the superiority of HVDC transmission is becoming more and more obvious. As an important high-end electrical equipment of the DC transmission system, the UHV DC wall bushing plays an important role in the economical transmission, flexible distribution and safe use of electric energy. [0003] At present, DC...

AI Technical Summary

Problems solved by technology

The capacitor core insulated in the capacitive bushing will produce partial discharge due to the influence of manufacturing quality, which will induce the deterioration of the internal insulation of the bushing, and then the insulation breakdown failure will occur

At the same time, the installation of insulators inside the inflatable bushing will cause space charge adsorption, which will lead to accelerated aging of the insulator, resulting in insulation breakdown failure, which reduces the reliability of the high-voltage wall-piercing bushing.

[0004] In order to solve the uncontrollable risk of DC transmission caused by the existing DC wall bushing due to its manufacturing and its own reasons, it is necessary to conduct in-depth research on the existing DC wall bushing, and carry out major structural improvements and optimizations if necessary. Therefore The development of a new type of purely inflatable DC wall bushing without any insulator can better solve the shortcomings and defects of the existing DC wall bushing and improve the reliability of DC power transmission

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