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In this paper, we analyzed the basic characteristics of natural ester oil, and introduced the basic research results in electrical structure design and insulating oil processing of a 110 kV oil-immersed transformer using natural ester oil, and then compared with that of mineral insulating oil transformer with the same grade. The application of natural ester insulating oil in power transformers was discussed. The results show that when the natural ester oil is used in transformers with voltage of 110 kV and below, the design principle of electrical structure can refer to mineral insulating oil transformer standard. The impregnation treatment of insulating parts and the selection of sealant pad when using the natural ester insulating oil are quite different from using mineral insulating oil. During the storage and transportation process, natural ester insulating oil should avoid contact with air to prevent oxidation. The kinematic viscosity of natural ester insulating oil has an obvious effect on the temperature rise of transformer, which should be corrected accordingly when designing the structure. On the basis of the excellent properties of natural ester insulating oil, it has broad prospects in power transformer field.
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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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