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Preparation and performance characterization of multi-component mixed insulating oil for transformers based on the structure-activity relationship between molecular structure and impulse discharge performance

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  • Hao, Jian
  • Ye, Wenyu
  • Zhang, Jingwen
  • Li, Jiacong
  • Zhang, Hanting
  • Liao, Ruijin

Abstract

Based on the structure-activity relationship of the molecular structure and properties of insulating oil, this paper prepared a multi-component mixed insulating oil through the guidance of density functional theory simulation and impulse experiment verification. The formulation of this multi-component mixed insulating oil involves the use of mineral oil, soybean oil, ethylhexyl laurate, and isooctyl laurate as base oils. The comprehensive physical, chemical, and electrical performance parameters of the multi-component mixed insulating oil were thoroughly tested, and all of them met the IEC 60296-(2012) standard. Compared with mineral oil, multi-component mixed insulating oil has greater advantages in kinematic viscosity, pour point, flash point, power frequency breakdown voltage, specific heat capacity and thermal conductivity. Compared with ester insulating oil and existing mixed insulating oil, the lightning impulse breakdown voltage of multi-component mixed insulating oil is about 8.19%–77.14 % higher. The multi-component mixed insulating oil has the potential to serve as a substitute for mineral oil in power transformers without necessitating any structural changes to the transformers. Furthermore, it achieves a dual-effect enhancement in insulation performance and thermal stability.

Suggested Citation

  • Hao, Jian & Ye, Wenyu & Zhang, Jingwen & Li, Jiacong & Zhang, Hanting & Liao, Ruijin, 2025. "Preparation and performance characterization of multi-component mixed insulating oil for transformers based on the structure-activity relationship between molecular structure and impulse discharge per," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225006656
    DOI: 10.1016/j.energy.2025.135023
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    References listed on IDEAS

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    1. Shen, Zijia & Wang, Feipeng & Wang, Zhiqing & Li, Jian, 2021. "A critical review of plant-based insulating fluids for transformer: 30-year development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    2. Ye, Wenyu & Hao, Jian & Zhang, Junyi & Zhang, Jingwen & Gao, Chenyu & Liao, Ruijin, 2023. "Atomic scale microparameter analysis of modified natural ester molecules related to impulse discharge characteristics under electric field," Renewable Energy, Elsevier, vol. 219(P1).
    3. Nurul Izzatul Akma Katim & Mohd Taufiq Ishak & Nur Aqilah Mohamad Amin & Mardhiah Hayati Abdul Hamid & Khairol Amali Ahmad & Norhafiz Azis, 2018. "Lightning Breakdown Voltage Evaluation of Palm Oil and Coconut Oil as Transformer Oil under Quasi-Uniform Field Conditions," Energies, MDPI, vol. 11(10), pages 1-15, October.
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