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Mechanisms for degradation of TR-XLPE impulse strength during service aging

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1 Author(s)
Boggs, S.A. ; Electr. Insulation Res. Center, Connecticut Univ., Storrs, CT, USA

While the retained AC strength of TR-XLPE distribution cable appears to be quite good at about 80% of the AC strength of degassed, as-manufactured cable, the impulse strength appears to drop linearly over time and has been reported to drop by as much as 50% during the first two years of normal service aging before leveling off. In this paper, we discuss the mechanisms by which the impulse strength can degrade to a greater degree than the AC strength. Three frequency-dependent mechanisms, which include electrothermal, electromechanical, and electrical, have been identified

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Power Delivery, IEEE Transactions on  (Volume:17 ,  Issue: 2 )