High-Performance Al 2 O 3 /Epoxy Resin Composites for Insulating Pull Rods of Direct Current High-Speed Switches

Youpeng Zhang, Jianying Zhong (), Liucheng Hao, Yue Zhai, Duanpeng Yuan, Yaxiang Wang, Ye Zhao, Yuanyuan Zhang, Mengjie Sun and Xin Lin ()
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Youpeng Zhang: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Jianying Zhong: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Liucheng Hao: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Yue Zhai: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Duanpeng Yuan: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Yaxiang Wang: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Ye Zhao: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Yuanyuan Zhang: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Mengjie Sun: Pinggao Group Co., Ltd., Zhengzhou 450046, China
Xin Lin: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

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

Abstract: Benefiting from their good mechanical and electrical properties, epoxy resin materials are widely utilized in the field of high-voltage electrical insulation devices. However, with the increase in voltage levels of equipment, the epoxy resin materials used for insulating pull rods in high-voltage electrical equipment are facing increasingly severe challenges. This study enhanced the mechanical and insulating properties of epoxy resin materials by molecular structure regulation, composite incorporation and formula optimization. The tensile strength, bending strength and impact strength of the epoxy resin materials with molecular structure regulation increased by 20.6%, 8.5% and 42.1%. The breakdown strength successfully increased from 27.6 kV/mm to 29.9 kV/mm. After combining with the modified Al 2 O 3 nanofillers, the breakdown strength, surface resistivity and volumetric resistivity of the composite further improved to 35.8 kV/mm, 2.7 × 10 16 Ω and 5.8 × 10 17 Ω·cm. The insulating pull rod prepared by this method achieved a flashover voltage of 18.5 kV, meeting the requirements for both insulating and mechanical performance of a prototype of 200 kV high-voltage direct current floor tank-type high-speed mechanical switch. This study can provide important support for the optimization of epoxy resin material formulation design and the development of epoxy-resin-insulating pull rods.

Keywords: epoxy resin materials; aluminum oxide; mechanical properties; insulating properties (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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