Insulation voltage equalizing tube used for super-high or extra-high voltage transformer and production process thereof

Abstract

The invention discloses an insulating equalizing pipe for a super-high voltage or ultra-high voltage transformer and a method for manufacturing the insulating equalizing pipe. The insulating equalizing pipe comprises an equalizing pipe, a pure insulation paper covering shell, pure insulation paper inner ring braces, a pure insulation paper inner cylinder body, pure insulation paper outer ring braces and a pure insulation paper outer cylinder body; the pure insulation paper covering shell is tightly covered on the outer wall of the equalizing pipe, and the pure insulation paper inner cylinder body is sleeved outside the pure insulation paper covering shell; and the pure insulation paper outer cylinder body is sleeved outside the pure insulation paper inner cylinder body. The insulating equalizing pipe greatly increases the insulation used field strength of the transformers, shortens the insulation distance of the bushing outgoing line of the transformers, eliminates the hidden trouble of the partial discharge generated by the transformer product, improves the operation reliability of the transformer, prolongs the working life of the transformer, and fills a domestic gap in the production of insulating equalizing pipes simultaneously.

Description

technical field [0001] The invention relates to a transformer insulating part, in particular to an insulating voltage equalizing tube for an ultra-high voltage or extra-high voltage transformer and a manufacturing method thereof. Background technique [0002] The rated voltage of ultra-high voltage transformer products is 350kV to 500kV, while the rated voltage of ultra-high voltage transformers is 750kV and above 750kV. Due to the high working voltage of this type of transformer, in some parts inside the transformer, such as the lead position of the coil, the electric field distribution is extremely uneven, and the local working field strength often exceeds the insulating material (oil-impregnated paper insulation) itself. Corona discharge occurs due to the strong permissible field, which reduces the reliability of the transformer operation and shortens the working life of the transformer. For this reason, it is necessary to place a metal tube with a large curvature radius...

AI Technical Summary

Problems solved by technology

Under the action of high-voltage working field strength, partial discharge will occur, which cannot meet the technical requirements of ultra-high voltage and ultra-high voltage transformer products

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