%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