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Investigation of water effects on degradation of crosslinked polyethylene (XLPE) insulation

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1 Author(s)
Nikolajevic, S.V. ; Cable Factory, Svetozarevo, Yugoslavia

This paper presents the results of the study of the influence of moisture on the electrical characteristics of XLPE power cable insulation under various service conditions. Tap water was put into the cable conductors and the ends were properly closed by terminal boxes in the first case, and opened in the second case. The samples of cables were subjected to electric stress and heating. Results from the accelerated aging tests of XLPE cables in these conditions are reported with reference to the changing of the XLPE's electrical characteristics. On the basis of the compared performances of XLPE cables given by this investigation, the lifetime of XLPE cables was estimated in the case of service under these conditions. Results of testing indicate that the combined effects of pressure of water or water vapour, electric field and temperature will greatly accelerate the deterioration of XLPE insulation

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Power Delivery, IEEE Transactions on  (Volume:8 ,  Issue: 4 )