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<p>The long-term performance of cross-linked polyethylene (XLPE) cable insulation was assessed using accelerated thermal aging combined with condition monitoring (CM) techniques. Lifetime estimation with the Arrhenius model showed a sharp reduction in failure time with increasing temperature, predicting about 49&#xa0;years of service at 60&#xa0;°C. Mechanical testing revealed a consistent decrease in elongation at break, where a 50% reduction was taken as the failure threshold along with reduced hardness due to thermo-oxidative chain scission. Physicochemical characterization confirmed progressive degradation: FTIR spectra detected the formation of carbonyl groups, while DSC analysis showed reduced oxidation induction times and crystallinity. Complementary TGA results further demonstrated lowered activation energies and diminished thermal stability in aged samples. Electrical evaluations supported these findings, with increased leakage current and partial discharge activity indicating a decline in dielectric strength consistent with structural and thermal damage. Overall, the combination of accelerated aging and Arrhenius-based modeling provides a reliable framework for estimating XLPE insulation lifespan. The integrated CM approach drawing on mechanical, thermal, chemical, and electrical analyses offers early detection of degradation and supports more effective strategies for maintaining long-term reliability of power cable systems.</p>

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Condition Monitoring and Life Prediction of Low-Voltage Electrical Power Cable Having Cross-Linked Polyethylene Insulation

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Wasif Shahzad,
  • Asma Ameer,
  • Kazim Hussain

摘要

The long-term performance of cross-linked polyethylene (XLPE) cable insulation was assessed using accelerated thermal aging combined with condition monitoring (CM) techniques. Lifetime estimation with the Arrhenius model showed a sharp reduction in failure time with increasing temperature, predicting about 49 years of service at 60 °C. Mechanical testing revealed a consistent decrease in elongation at break, where a 50% reduction was taken as the failure threshold along with reduced hardness due to thermo-oxidative chain scission. Physicochemical characterization confirmed progressive degradation: FTIR spectra detected the formation of carbonyl groups, while DSC analysis showed reduced oxidation induction times and crystallinity. Complementary TGA results further demonstrated lowered activation energies and diminished thermal stability in aged samples. Electrical evaluations supported these findings, with increased leakage current and partial discharge activity indicating a decline in dielectric strength consistent with structural and thermal damage. Overall, the combination of accelerated aging and Arrhenius-based modeling provides a reliable framework for estimating XLPE insulation lifespan. The integrated CM approach drawing on mechanical, thermal, chemical, and electrical analyses offers early detection of degradation and supports more effective strategies for maintaining long-term reliability of power cable systems.