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In order to meet the stress grading requirements of the 18 kV hydro-generator in a large hydropower station with an altitude of 2 500 m, the air breakdown field strength and its influencing factors at the target altitude were analyzed theoretically, and the overhang electric field characteristics was evaluated by establishing a three-dimensional simulation model of stator winding overhang, the influences of the clearance distance and binding structure on the electric field at overhang hypotenuse were analyzed, the scheme of controlling the minimum clearance distance at the overhang hypotenuse of the stator winding to 15 mm was determined. Finally, the stress grading performance of 18 kV hydro-generator stator coil and winding was tested and verified in a large high-altitude environmental simulation laboratory. The results show that the stress grading performance of the 18 kV hydro-generator is good and can meet the stress grading requirements at an altitude of 2 500 m.
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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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