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 and Jin Li ()
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Wenbo Zhu: Electric Power Research Institute, China Southern Power Grid Company, Guangzhou 510080, China
Kaulya Pathiraja: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Xu Guo: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Baojun Hui: Electric Power Research Institute, China Southern Power Grid Company, Guangzhou 510080, China
Mingli Fu: Electric Power Research Institute, China Southern Power Grid Company, Guangzhou 510080, China
Linjie Zhao: Electric Power Research Institute, China Southern Power Grid Company, Guangzhou 510080, China
Yuhuai Wang: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Jin Li: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

Energies, 2025, vol. 18, issue 14, 1-16

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 (C 13 H 10 O 3 ) 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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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