A recent development in the electrical insulation systems of generators and transformers

Abstract

Mica/epoxy and oil/cellulose have dominated insulation systems of rotating machines and power transformers for over 100 years. In recent years, however, XLPE cables have been introduced to generators and transformers as HV windings. This has resulted in a new type of generator (Powerformer/sup TM/), a new type of wind-power system (Windformer/sup TM/) and a new type of transformer (Dryformer/sup TM/). The new types of HV generator and transformer offer high efficiency, long life and low environmental impact and give new possibilities for the design of HV apparatus. The products developed represent new demonstrated possibilities in HV electromagnetism utilizing the potential in Maxwell's equations.