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In order to better guide the application of composite insulation crossarms, the lightning impulse voltage, wet power frequency flashover voltage, pollution flashover voltage, and pollution snow-covered flashover voltage of the square tube composite insulation crossarm and the square bar composite insulation crossarm were compared and studied through experiments. The results show that the 50% dry lightning flashover voltage of the 10 kV square tube composite insulation crossarms is 388.3 kV, which is higher than that of the square bar composite insulation crossarm (370.0 kV). However, the wet power frequency withstand voltage, pollution withstand voltage, and pollution snow-covered flashover voltage of the square tube composite insulation crossarms are lower than that of the square bar composite insulation crossarms. Finally, the different application scheme of the composite insulation crossarms under different operating environment is proposed.
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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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