Electrical–Thermal Aging Performance of PAH-Modified Interfacial Coating Agent for HVDC Cable Accessory

Wenbo Zhu; Kaulya Pathiraja; Xu Guo; Baojun Hui; Mingli Fu; Linjie Zhao; Yuhuai Wang; Jin Li

doi:10.3390/en18143767

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and

¹

Electric Power Research Institute, China Southern Power Grid Company, Guangzhou 510080, China

²

Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

^*

Author to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Energies2025, 18(14), 3767;https://doi.org/10.3390/en18143767

This article belongs to the Special Issue Recent Progress, Challenges and Outlooks of Insulation System in HVDC: 2nd Edition

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Abstract

A novel interfacial coating agent was developed by modifying silicone oil with polycyclic aromatic hydrocarbons (PAHs) to enhance the insulation performance of HVDC cable accessories. This study investigates the effects of corona and hot–cold cycle aging on the DC breakdown characteristics of the Cross-Linked Poly Ethylene and Ethylene Propylene Diene Monomer (XLPE/EPDM) interface. Interfacial breakdown tests, infrared spectroscopy, and a microstructural analysis were employed to investigate aging mechanisms. The results show that PAH-modified silicone oil significantly increases the breakdown voltage, with 2,4-dihydroxybenzophenone (C₁₃H₁₀O₃) identified as the optimal additive via quantum chemical calculations (QCCs). Even after aging, the modified interface maintains its superior performance, confirming the long-term reliability of the coating.

Keywords:

HVDC cable accessory; interface breakdown; coating agent; corona aging; hot–cold thermal cycling; XLPE; EPDM

Electrical–Thermal Aging Performance of PAH-Modified Interfacial Coating Agent for HVDC Cable Accessory

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