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In this paper, the effect of electrical parameters of the semi-conductive layer on the surface electric field distribution of post insulator used in substation was calculated and analyzed by COMSOL. The results show that the semi-conductive layer can weaken the maximum electric field caused by water droplets, wet pollution, and dry pollution to different degrees, and the wet pollution is the most significant, with the electric field decreasing amplitude of 41.58%. Coating semi-conductive layer at the high voltage terminal has a significant improvement effect on the electric field, and the maximum decreasing amplitude of surface maximum electric field is 14.5% compared with not coating semi-conductive layer. When the high and low voltage terminals are coated by semi-conductive layer with the best relative dielectric constant, the comprehensive balance of electric field improvement is better. In the normal range of porcelain electrical parameters, the optimal electrical parameters of semi-conductive layer are universal, the relative dielectric constant of the optimal semi-conductive layer at high voltage terminal is 22, and the relative dielectric constant of that at low voltage terminal is 12. In addition, the resistivity of the semi-conductive layer at high and low voltage terminals should be at least greater than 1×107 Ω·m and 6×107 Ω·m, respectively, and the maximum electric field will be less than the case without semi-conductive layer.
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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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