The electric components play a significant role in the manufacture of the equipment of high voltage (cable, transformers, condansers).Insulating materials must have properties very significant in order to deal with various constraints such as:thermic,electric,mechanical contraints.

Unfortunately, the insulating materials often lose their properties and undergo degradation specific in particular the reduction in dielectric rigidity but also a deterioration able to abolisch the insulating matter.

The most significant origin of the degradations undergone by insulating materials constitutes an insulation subjected to the high voltage is that due to the action of the partial discharges which constitute on of the principal cause reduction in the lifespan of the electrical appliance but also of their deterioration.

These partial discharges are also the cause of several accident (explosion, fires) creating damage significant which can be the economic origin of unfavorable effects and even of the accidents fatal, from where the need for a study on the impact of the insulation of the electrical appliance, their evolution, the danger which they generate thate it is on the industrial processes.