%0 Journal Article %A Petru V. Notingher and Stefan Busoi and Laurentiu M. Dumitran and Cristina Stancu and Gabriel Tanasescu and Emanuel Balescu %D 2009 %J International Journal of Electrical and Computer Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 25, 2009 %T Ageing Assessment of Insulation Systems by Absorption/Resorption Currents %U https://publications.waset.org/pdf/5413 %V 25 %X Degradation of polymeric insulation systems of electrical equipments increases the space charge density and the concentration of electrical dipoles. By consequence, the maximum values and the slopes of absorption/resorption (A/R) currents can change with insulation systems ageing. In this paper, an analysis of the nature of the A/R currents and the importance of their components, especially the polarization current and the current given by the space charge, is presented. The experimental study concerns the A/R currents measurements of plane samples (made from CALMICAGLAS tapes), virgin and thermally accelerated aged. The obtained results show that the ageing process produces an increase of the values and a decrease of shapes of the A/R currents. Finally, the possibility of estimating insulations ageing state and lifetime from A/R currents measurements is discussed. %P 45 - 51