Ultrahigh voltage DC through-wall bushing component

Abstract

The invention provides an ultrahigh voltage DC through-wall bushing component comprising a bushing body, voltage equalizing rings which are coaxially arranged at the two ends of the bushing body, and an insulating external sleeve which sleeves the external wall of the bushing. The voltage equalizing rings are multi-curvature voltage equalizing rings. The insulating external sleeve is a zigzagged insulating external sleeve. One end, which is connected with a transition cylinder, of a shielding cylinder is a wide mouth end, and one end away from the transition cylinder is a narrow mouth end. The wide mouth end of the shielding cylinder is connected with the transition cylinder via a flange. The narrow mouth end of the shielding cylinder is connected with the external wall of a conductive cylinder component in a sealing way. The component is suitable for various lengths of conductive tubes, the cantilever load of the bushing is optimized and the overall suspension deformation is reduced so that the overall electric field distribution of the bushing is enabled to be more uniform, electric field tip ends can be reduced, and reliability and the service life of the DC through-wall bushing in an electric field can be enhanced.

Description

technical field [0001] The invention relates to the technical field of wall-piercing bushings, in particular to an UHV DC wall-piercing bushing assembly. Background technique [0002] According to literature reports, since HVDC transmission was put into operation in the 1950s, after more than 50 years of development, UHVDC transmission technology has been gradually improved. The main equipment has passed the factory test and more than 1,000 kilometers of transmission lines have been built. The research and development of UHV DC transmission technology in the international industry and academia has not been interrupted, especially the construction and operation of AC UHV projects in the former Soviet Union and Japan; relying on the accumulation of years of operating experience, the design and manufacturing technology of key equipment It has developed maturely, and the production and manufacturing of UHV DC wall bushings in the research and development process of UHV DC equip...

AI Technical Summary

Problems solved by technology

[0003] At present, the technologies in the patents "201410773353.5 A UHV DC Bushing Joint" and "201420801911.X A UHV DC Wall-Through Bushing Central Conductive Tube Assembly" solve the problem of central conductive tube disturbance caused by the shaft inside the bushing. The change of the symmetrical electric field distribution affects the insulation performance of the bushing and overcomes the defect that the bushing electrode breaks down due to incomplete cleaning of the inner wall of the conductive tube, residual metal debris or suspended matter; but both patents have problems due to The uneven electric field distribution and excessive electric field tips caused by the overall overhang deformation affect the reliability of the DC wall bushing in the electric field.

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