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The relationship between the withstand voltage and the thickness of the sheath was studied when the air gap distance is 0, 5, 10, 15 cm, respectively. The influence of the length of sheath on the development of creeping discharge was studied when the sheath surface is dry, wet, and dirty, respectively. The results show that with the increase of the length and thickness of gap, the breakdown voltage of the insulating sheath-air combined gap increases nonlinearly, and the increase rate of the breakdown voltage also increases. The surface flashover electric field intensity of the insulating sheath decreases obviously in dirty state, the average flashover electric field intensity is 1.2 kV. Based on the above research, the configuration of anti bird droppings flashover insulating sheath was obtained. The thickness of the sheath is determined according to the line voltage level, and then the covering length is determined by the maximum surface flashover distance. It is recommended that the thickness and covering length of sheath in 110 kV transmission line is 6 mm and 60 cm, respectively; while the thickness and covering length of sheath in 220 kV transmission line is 8 mm and 110 cm, respectively.
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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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