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In this paper, power frequency breakdown tests were conducted on mixed insulating oil containing mineral oil and ethyl laurate. The insulation breakdown characteristics of mineral oil, lauric acid modified ester, and the mixed insulating oil were compared and analyzed. An insulating oil model containing H2O and H3O+ was established, and the microscopic influence mechanism of ethyl laurate on the power frequency breakdown characteristics of the mixed insulating oil was elucidated through molecular dynamics simulations. The results show that under a 2 mm oil gap, the breakdown voltages of ethyl laurate and the mixed insulating oil are 29.8% and 20.8% higher than that of mineral oil, respectively. The failure field strength distributions of mineral oil, ethyl laurate, and the mixed insulating oil range from 5.62 kV/mm to 12.9 kV/mm, with both ethyl laurate and the mixed insulating oil exhibiting higher failure field strengths than mineral oil. Compared with mineral oil molecules, ethyl laurate forms more hydrogen bonds with H2O and H3O+, exhibits stronger interaction energy, and has a smaller free volume fraction. In summary, the diffusion motion of impurities such as H2O and H3O+ in ethyl laurate and the mixed insulating oil is inhibited, making it difficult to form conductive "small bridges",and thus the insulation performance of ethyl laurate and the mixed insulating oil is superior to that of mineral oil.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 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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