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公开(公告)号：EP2044138A1
公开(公告)日：2009-04-08
申请号：EP07787078.0
申请日：2007-07-05
申请人： ABB Research Ltd
摘要： A hardenable epoxy resin composition which is suitable for the production of an electrical insulation with improved thermal ageing properties, wherein said hardenable epoxy resin composition comprises an epoxy resin, a hardener, an inorganic filler composition, and a coupling agent for improving the bonding between the polymer matrix and the filler, and optionally further additives, characterized in that, (i) the filler composition comprises silica and aluminum trihydride (ATH) at a ratio of silica:ATH from 10:1 to 1:10; (ii) the average particle size distribution of the silica is within the range of from 100 µm - 0.5 µm; (iii) the average particle size distribution of ATH is below 10 µm, preferably within the range of from 10.0 µm - 0.5 µm; and (iv) the filler composition is present in an amount within the range of 20-80% by weight, calculated to the total weight of the insulating composition, and wherein (v) the coupling agent is present preferably within the range 20 of 0.1% - 10% by weight, calculated to the total weight of the insulating composition, the use of the composition for the production of an electrical insulation, and electrical articles containing such an electrical insulation system.
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公开(公告)号：EP2074639A1
公开(公告)日：2009-07-01
申请号：EP06804816.4
申请日：2006-10-19
申请人： ABB Research Ltd.
CPC分类号： H01F27/2847 , H01F27/327 , H01F2027/328
摘要： 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 (7) made up of four turns of a protective foil (8) comprising a layer consisting of woven glass fibers impregnated with silicone resin with an admixture of mica. An inner part winding (3) and an outer part winding (4) are separated by a gap (5) comprising twelve rectangular aluminium tubes as spacers (6). At a lower end, the end face of the winding is covered with a protective cover (9) comprising epoxy resin.
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