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Dry air is widely used as an alternative to SF₆ gas in gas-insulated switchgear (GIS). However, metallic particle contamination is a key issue that restricts the development of high-voltage GIS. In this paper, a model for predicting the cumulative breakdown probability of high-voltage air gaps was established on the basis of time-volume theory, and the influence of metallic particles on the breakdown characteristics of high-voltage dry air gaps at high voltage levels was studied. The results show that metallic particles located near the electrodes are more likely to cause gap breakdown, and those near the high-voltage electrode are more likely to cause breakdown than those near the grounded electrode. Meanwhile, particles with sharp protrusions are more likely to cause gap breakdown than round particles. Therefore, in the design of gas-insulated equipment, particle traps or barriers should be used to keep metallic particles away from the electrodes, and the occurrence of particles with sharp protrusions should be avoided as much as possible.
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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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