Production technology of low-density flexible paper used for molded insulators of extra/ultra high voltage transformers

Abstract

The invention discloses a production technology of low-density flexible paper used for molded insulators of extra / ultra high voltage transformers. The production technology comprises the following steps: 1) performing mixing and beating on cotton fibers and wood fibers to obtain a pulp; 2) diluting the concentration of the pulp to 0.2-0.6%, removing impurities and foreign matters from the pulp, and performing dehydration on the clean pulp, so as to improve the concentration of the pulp to 2-5%; 3) making the prepared wet paper blank fibers arranged in a vertical state by utilizing a vacuum negative pressure method; and 4) adding a pressure to wet paper blanks in a thickness direction, so as to enable the wet paper blank fibers to be pressed and twisted to form a dead lock state, and further to enable the prepared low density flexible wet paper to be used for the production of the molded insulators of the extra / ultra high voltage transformers. According to the production technology, a formula of raw materials is optimized, so that the final product has good flexibility and also has very high strength, the production technology is simplified, and the insulation property of the final product is improved. The vacuum negative pressure method is utilized to make the fibers arranged vertically in the same direction, so that the fibers can twist to be locked deadly after subjected to pressure, and the strength and flexibility of the final product are further improved.

Description

technical field [0001] The invention relates to the field of production and manufacture of electrical insulating parts, in particular to a low-density flexible paper production process for forming insulating parts of super / ultra-high voltage transformers. Background technique [0002] The rated voltage of the usual ultra-high voltage transformers is 350KV to 500KV, while the rated voltage of UHV transformers is 750KV and above 750KV. The molded insulating parts used in EHV / UHV transformers are generally used for the outlet position of the coil. This position has the characteristics of high field strength, high voltage, and high current during the operation of the transformer, so the insulating material at this position has higher requirements. Mechanical and electrical performance requirements. At present, domestic insulation material manufacturers generally use 100% coniferous wood pulp as raw materials, and improve the stability of products by optimizing the papermaking t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor mechanical and electrical properties of the molded insulating parts produced by the papermaking technology of wet paper for ultra / ultra-high voltage transformers described in the background technology and the wet forming process, and provide a Production process of low-density flexible insulating paper blank for forming insulation parts of EHV / UHV transformers

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