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Molecular dynamics simulation on effect of water on methanol diffusion in vegetable insulating oil
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Yasha LI1, Lumin WANG1, Wei WANG2, Jiamin WANG1, Junzhang CHEN1, Yuekai ZENG1, Menghao PANG1
Insulating Materials | 2024, 57(5) : 79 - 85
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Insulating Materials | 2024, 57(5): 79-85
• Special Issue on High-performance Transformer Insulation •
Molecular dynamics simulation on effect of water on methanol diffusion in vegetable insulating oil
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Yasha LI1, Lumin WANG1, Wei WANG2, Jiamin WANG1, Junzhang CHEN1, Yuekai ZENG1, Menghao PANG1
Affiliations
  • 1College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
  • 2State Grid Xiaogan Power Supply Company, Xiaogan 432000, China
Published: 2024-05-20 doi: 10.16790/j.cnki.1009-9239.im.2024.05.012
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Methanol is an important characteristic component in the evaluation of oil-paper insulation state of transformer due to its strong stability and high content in the early ageing stage of insulating oil, while water is an indispensable product during the ageing process of oil-paper. In order to clarify the effect of water on the methanol diffusion in vegetable insulating oil, blending models of vegetable insulating oil, water, and methanol with water content of 1.0%, 1.5%, 3.0%, and 5.0% were constructed, and the diffusion trajectory, diffusion coefficient, interaction energy, hydrogen bonding, free volume of the substances in the model were calculated by molecular dynamics method. The mechanism of water promoting methanol diffusion was explained from microscopic perspective. The results show that with the increase of water content, the interaction energy between methanol and vegetable insulating oil decreases, the hydrogen bond stability of the system decreases, and the free volume increases, which ultimately leads to the enhancement of methanol diffusion in vegetable insulating oil.

methanol  /  oil-paper insulation  /  diffusion effect  /  molecular dynamics
Yasha LI, Lumin WANG, Wei WANG, Jiamin WANG, Junzhang CHEN, Yuekai ZENG, Menghao PANG. Molecular dynamics simulation on effect of water on methanol diffusion in vegetable insulating oil[J]. Insulating Materials, 2024 , 57 (5) : 79 -85 . DOI: 10.16790/j.cnki.1009-9239.im.2024.05.012
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2024.05.012
  • Receive Date：2023-10-29
  • Online Date：2025-12-22
  • Published：2024-05-20
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  • Received：2023-10-29
  • Revised：2023-11-30
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    1College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China
    2State Grid Xiaogan Power Supply Company, Xiaogan 432000, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2024.05.012
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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