Abstract: A curable epoxy resin composition is provided. The composition includes at least one diglycidyl ether of bisphenol A (DGEBA) and at least one diglycidyl ether of bisphenol F (DGEBF) as epoxy resins, in which the weight ratio of DGEBA:DGEBF is within the range of about 15:85 to 45:55; (ii) an anhydride hardener; (iii) and at least one plasticizer. The composition can additionally include a catalyst, at least one filler material and/or further additives. The dynamic complex viscosity value (?*) of the composition is within the range of 0.1 to 20 Pa·s. The present disclosure also provides a process for making the composition and electrical articles including an electrical insulation system made from the composition.

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.

Abstract: 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. The filler composition comprises silica and aluminum trihydride (ATH). The composition can be used for the production of an electrical insulation, and electrical articles containing such an electrical insulation system.