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A finite element simulating model of stator bar end was established by COMSOL software, and the influences of electrical properties parameters of insulating material on the electric field and potential distribution of bar end were analyzed. The results show that with the increase of relative permittivity of main insulation, the maximum electric field on stator bar end surface increases, therefore it is better to choose smaller relative permittivity of main insulating material. The resistivity of main insulation material has no significant effect on the maximum electric field on bar end surface. The relative permittivity of each anti corona layer has little effect on the maximum electric field on bar surface. It is better to choose larger nonlinear resistance coefficient of medium resistance anti corona layer. The nonlinear resistance coefficients of medium and high resistance anti corona layer have little effect on the maximum electric field on bar surface, and it is best to choose 1. The nonlinear resistance coefficient of high resistance anti corona layer has no effect on the maximum electric field on bar surface. The influence degree of initial resistivity of different anti corona layers on the maximum electric field of bar surface is different. Through partial correlation analysis, the influence degree of electrical properties parameters of insulating material on the maximum electric field at bar end is ranked, and the initial resistivity and nonlinear resistance coefficient of the medium resistance anti corona layer are the dominant factors.
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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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