Abstract:The purpose of this study is to show the effect of hydrostatic
pressure on the electrical ageing, by a dc voltage, on polyethylene used in
submarine cables. Experimental results are obtained at 1 and 300 bar, for a
temperature of 70 °C in the range of an electrical field of
1.1-4.5 MV cm-1 and for up to 1500 h of ageing. By using the Weibull
statistic and the estimation of confidence bounds of 90%, the results have
shown an increase of lifetime with pressure. The time dependence of the
breakdown behaviour of t… Show more
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