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Detection and localisation of water ingress in mass impregnated cables R. Papazyan, R. Neimanis |
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Increase in moisture content is one of the most common causes for deterioration of insulation properties and premature ageing of oil impregnated insulation systems. Apart from qualitative detection, water ingress localisation is of considerable interest in diagnosis of mass- impregnated cables. Water ingress in a mass-impregnated cable sample was studied using time domain reflectometry (TDR) and low frequency dielectric spectroscopy. For experimental purposes, the water penetration was initiated by cutting the cable sheath and introducing tap water into the place of damage. TDR measurements revealed both the position and dynamics of water ingress. This process was further quantified by dielectric spectroscopy and water content measurements. |