Development of new insulation system for use in oil-filled transformers

Attempting to overcome the shortcomings of the cellulose insulation, insulation manufacturers have evaluated a variety of materials to potentially replace cellulose. At present, Nomex aramid paper is the most widely accepted replacement material. The product´s advantages are high temperature properties. While it is suitable for use up to 220°C, other components, most notably the mineral oil, cannot be used at that temperature. In an effort to find a more suitable insulator material than the kraft or aramid papers for use in an oil filled transformer, various polymers and composite materials are evaluated