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Furan molecule is one of the important characteristic products of insulating paper pyrolysis during local thermal failure of oil-immersed transformer, and the detection of furan molecules content in transformer oil is an important off-line testing method to assess the operating condition of transformer. In order to clarify the diffusion process of furan molecules from insulating paper to insulating oil and its correlation with temperature labels of local overheating fault, molecular dynamics methods were used to study the diffusion process of furan molecules from insulating paper to vegetable oil based on nanoscale oil-paper interface models under room temperature (300 K), low temperature overheating (500 K), medium temperature overheating (750 K), and high temperature overheating (1 000 K). The results show that with the increase of temperature, the diffusion coefficient of furan molecules in oil-paper insulation increases gradually, and the number of furan molecules diffusing from insulation paper to vegetable oil changes closely with temperature. There are few furan molecules diffuse into vegetable oil under 300 K and 500 K. Under the temperature of 750 K and 1 000 K, some of furan molecules diffuse into vegetable oil, and the molecule number increases with temperature. The above simulation results are consistent with the empirical basis that furan compounds can be detected in local overheating fault of medium and high temperature in oil-immersed transformers.
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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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