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In order to improve the insulation ability of the three media interaction area of basin insulator, the reasons of the accumulation of foreign body, and the flashover along the basin insulator surface induced by the structure design defect of the three media interaction area was analyzed from the composition of three media interaction area, the movement characteristics of foreign body and the typical discharge phenomenon. Through electric field simulation, the influence of grounding shielding electrode, the flange thickness of basin insulator, and the distance between the grounding shielding electrode and the busbar cylinder flange on the electric field intensity in the low potential three interaction area were studied, the variation law of electric field in the high potential three interaction area with tilting angle and three media interaction area width of basin insulator were given. The calculation method of the thickness of the high voltage side of grounding shield electrode to prevent resin through failure and the criterion of electric field check in the three media interaction area were presented. The results show that the reasonable structure design of three media interaction area with high and low potential can effectively inhibit the surface flashover induced by foreign matter accumulation.
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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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