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<p>This paper studies the thermal aging effects on 60 kV high voltage cables properties insulated with XLPE (cross-linked polyethylene). Mechanical properties degradation is used as macroscopic indicator. Changes in structure and morphology assessed by FTIR and XRD are used as microscopic indicators. Both microscopic and macroscopic indicators have confirmed that aging under higher temperatures affect dramatically XLPE behavior. Mechanical properties declining are due to a thermo-oxidation process caused by the antioxidant consumption. Besides, an important increase of carbonyl index is also caused by this thermo-oxidation degradation at microscopic scale. The drastic deterioration of the material was noticed after 2000 h of aging at 110 °C and 135 °C. This aging time can be taken as a critical time between two underwent different aging processes. Moreover, the mechanical properties evolutions are used to determine the thermal endurance and the temperature index (IT) of the material by using the Arrhenius formulation. Finally, a cross-correlation assessment between macroscopic and microscopic results was given in the end of this paper.</p>

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Mechanical behavior of 60 kV HV XLPE insulation under thermal aging and cross-correlation assessment of degradation mechanisms

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Abdelhay Smaida,
  • Yacine Mecheri,
  • Larbi Boukezzi,
  • Slimane Bouazabia

摘要

This paper studies the thermal aging effects on 60 kV high voltage cables properties insulated with XLPE (cross-linked polyethylene). Mechanical properties degradation is used as macroscopic indicator. Changes in structure and morphology assessed by FTIR and XRD are used as microscopic indicators. Both microscopic and macroscopic indicators have confirmed that aging under higher temperatures affect dramatically XLPE behavior. Mechanical properties declining are due to a thermo-oxidation process caused by the antioxidant consumption. Besides, an important increase of carbonyl index is also caused by this thermo-oxidation degradation at microscopic scale. The drastic deterioration of the material was noticed after 2000 h of aging at 110 °C and 135 °C. This aging time can be taken as a critical time between two underwent different aging processes. Moreover, the mechanical properties evolutions are used to determine the thermal endurance and the temperature index (IT) of the material by using the Arrhenius formulation. Finally, a cross-correlation assessment between macroscopic and microscopic results was given in the end of this paper.