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Aiming at the problem that the anti-corona structure of newly replaced stator bars is different from that of original factory stator bars when the stator bar is partially replaced in the stator winding accident handling for large hydro-generators, this paper employed the finite element simulation software to simulate and analyze the electric field distribution at the winding ends of the stator bars with two kinds of anti-corona structures under mixed use conditions, and calculate the distribution laws of potential and electric field intensity at the ends. A wingding model was constructed based on two kinds of stator bars, and the theoretical analysis results were verified by corona test. The results show that under the 1.1UN assessment voltage, the electric field intensity at the end of the stator winding with a mixed use of the bars with two kinds of anti-corona structures meets the requirements of relevant standards, and there is no abnormal corona risk. The test further confirms that the mixed use of the stator bars with two kinds of anti-corona structures can effectively avoid corona corrosion at the end. This study verifies the feasibility of the mixed use of newly developed anti-corona structure bars and original factory bars, providing reliable technical support for the partial replacement of stator windings in large hydro-generators.
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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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