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公开(公告)号：EG25617A
公开(公告)日：2012-03-26
申请号：EG2009040475
申请日：2009-04-08
Applicant: ABB RESEARCH LTD
Inventor： SCHAAL STEPHANE , GONZALEZ PATRICIA , ARNUZO FRANCISCO
Abstract: To improve its fire resistance, the winding of a low voltage coil for a dry transformer is, at its circumferential surface, covered by a wrap made up of four turns of a protective foil comprising a layer consisting of woven glass fibers impregnated with silicone resin with an admixture of mica. An inner part winding and an outer part winding are separated by a gap comprising twelve rectangular aluminium tubes as spacers. At a lower end, the end face of the winding is covered with a protective cover comprising epoxy resin.
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