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

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

Energy, 2025, vol. 319, issue C

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.

Keywords: Multi-component mixed insulating oil; Structure-activity relationship; Performance characterization; Transformer; Molecular structure (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:319:y:2025:i:c:s0360544225006656

DOI: 10.1016/j.energy.2025.135023

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