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According to the sand parameters around the transmission line corridors in Tibet, Xinjiang, Qinghai and other high incidence of sandstorms regions and the relevant data of dust weather, the wind speed, particle size, concentration, charge/mass ratio and other specific parameters for sand simulation were determined, and a testing apparatus was built. The effect of simulated sand conditions on the power frequency discharge voltage of external insulation in the gap was tested by using this device at an altitude of 2 200 m. The results show that the simulated sand dust environment will decrease the power frequency discharge voltage of the short gap below 0.2 m, but will not reduce the power frequency discharge voltage of the long air gap above 0.2 m, and the charged dust in the air itself is not the cause of the gap trip discharge.
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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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