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Diagnosis of moisture in oil/paper distribution Cables - Part II: Water penetration in cable insulation - experiment and modeling

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3 Author(s)
Neimanis, R. ; Programma Electr. AB, Taby, Sweden ; Eriksson, R. ; Papazyan, R.

For Pt.I see ibid., vol.19, no.1, p.9-14, January 2004. Dynamics of water penetration in mass impregnated cable insulation has been studied. For experimental purposes, artificial damage has been inflicted to a 40-cm-long cable sample and water ingress has been continuously monitored by frequency response measurements. A similar experiment has been conducted on 2.8-m-long cable sample, where both frequency response and time-domain reflectometry (TDR) measurements have been performed. After termination of both experiments, actual moisture content has been measured radially and axially. Based on dielectric measurements, a model of water ingress has been developed and diffusion coefficients have been estimated for mass impregnated cable paper.

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Power Delivery, IEEE Transactions on  (Volume:19 ,  Issue: 1 )