Process for manufacture of high voltage transformers and the lik

Details Process for manufacture of high voltage transformers and the lik Process for manufacture of high voltage transformers and the lik

1979-10-01

1982-06-08

Lusignan, Michael R.

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

264102, 264261, 264263, 26427219, 336 96, 336 84C, H02K 1512

Patent

active

043339000

ABSTRACT:
A process for making an encapsulated electrical insulation system such as a transformer which includes a porous fiber material filling. The system is vacuum baked at a temperature range of 100.degree. C. to 155.degree. C. for at least four hours, and is then vacuum impregnated with a mixture of a modified bisphenol A epoxy resin hardener comprising various acid anhydrides plus promoters. Pressure is then applied to the system of 1,000 psi. of nitrogen at 80.degree. C. for 2 to 12 hours. Thereafter, the temperature is increased to 110.degree. C. for 2 to 12 hours. The system is then cured at 135.degree. C. for approximately 12 to 24 hours. To minimize corona, shields are placed in selected portions of the transformer, the shields having edges formed into radii ends to avoid points at which corona would normally tend to concentrate. Also, the transformer is wound using ultra-clean components to obtain a transformer package that is free from impurities prior to impregnation.

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patent: 4009306 (1977-02-01), Yamashita
patent: 4054680 (1977-10-01), Sharbaugh

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