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When the typical insulation structure of 500 kV transformer based on mineral oil is directly applied to the natural ester insulating oil transformer, there are weak points of insulation that need to be improved. In this study, the safety margin of the insulation structure scheme for mineral oil was improved by increasing the main insulation distance, thickening the winding insulation, and optimizing the distribution of longitudinal capacitance of the winding. A designing scheme of insulation structure for 500 kV natural ester insulation oil transformer was formed, and simulation verification of the main insulation and longitudinal insulation of the new scheme was carried out. The results show that the scheme meets the insulation design requirements, the prototype of 500 kV natural ester insulating oil transformer developed with this scheme has successfully passed all the insulating tests.
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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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