Abstract

XLPE power cables have become the core insulation material in the power cable industry and are widely used in high-voltage and extra-high-voltage cable systems due to their advantages of large transmission capacity, excellent dielectric properties, and stable physicochemical characteristics. The aging state of XLPE directly affects the safety and stability of power transmission. Therefore, an in-depth analysis of the aging mechanisms, a thorough understanding of the aging patterns, and the establishment of a scientific aging condition assessment framework are of great significance for ensuring the reliable operation of XLPE cables. In this paper, a nondestructive detection study of thermal aging in XLPE is conducted based on terahertz (THz) spectroscopy, focusing on the evolution of optical parameters during the thermal aging process. The research demonstrates that THz spectroscopy can sensitively capture the dynamic changes occurring during the thermal aging of XLPE. This provides a novel technical approach and theoretical support for the nondestructive evaluation of thermal aging in the cable industry. The findings hold substantial theoretical value and practical significance for safeguarding the secure and reliable operation of power cables and preventing electrical accidents.

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