ABOUT DIFFERENTS TECHNICALS VALIDATIONS OF THERMAL STEP METHOD

The measurement of space location in insulating material is necessary to know phenomenon which are important such as the breakdown. In this article, we show the precision and the reliability of the thermal step method by using some validations. The experimental validation consist s in putting, between two insulating slabs of unknow thickness, a plan e of charges realized by an aluminium sheet which has been submitted t o a high tension before the measure. The experiment holds in the order to determine charges and to deduce the thickness of each slab. We val id the numerical treatments by simulations ; by using a known distribu tion of charge, we calcul the current ; from this current we determine the new distribution of charge which is compared to the first one. We valid also the thermal step method by using two different numerical t reatments (by Fourier and by derivation) which are applied to an exper imental current.