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Firstly, a natural ester was exposed to the air, and the relationships between its properties and exposure to air duration were measured. Then the oxidation situation of insulating part impregnated with natural ester in air was observed, and the natural ester on the insulating part was removed by traditional gas-phase drying method. Finally, the withstand field strength of solid insulating parts in natural ester transformer was calculated by an electric field analysis software. The results show that the water content of the natural ester increases significantly after exposure to air, but its other characteristics change little. There is no oxide film forming on the surface of insulating parts after exposed to room temperature for two months. The natural ester in insulating parts cannot be removed by gas-phase drying method completely. The withstand field strength of insulating parts in natural ester transformer is 10% higher than that in mineral oil transformer with the same structure.
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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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