Electrical Machine Insulation: Traditional Insulating Materials, Nanocomposite Polymers and the Question of Electrical Trees
Electrical machine insulation consists basically of epoxy resin and mica foils. Both are good insulating materials and they proved to withstand large partial discharges and/or the combined attack from electrical, thermal and mechanical stresses. Nowadays alternatives to the traditional insulating materials exist, namely those of nanocomposite polymers, which present somehow improved performance regarding the aforementioned stresses. It is the aim of the present paper to investigate mechanisms of electrical treeing and/or breakdown in machine insulation as well as to study possible improvements with the aid of nanocomposite polymers.