IEEE Power Engineering Review · 2002 · 15 citations · 6 references
EngineeringElectrical EngineeringMaterials EngineeringAgingCorrosion ScienceMaintenance EngineeringDurabilityInsulation SystemsMaterial DegradationMaterial Degradation AssessmentMaterial DeteriorationService LifeAgeing EffectsAging Degradation AnalysisCable DistributionCable InsulationDielectric AgingInsulation AgingInsulation Performance DegradationThermal Aging
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 contribution, we discuss the mechanisms by which the impulse strength can degrade to a greater degree than the ac strength. Three frequency-dependent mechanisms have been identified, which include electro-thermal, electro-mechanical, and electrical.
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