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In humid and dirty environment, it is easy for high voltage switchgear to trigger discharge or insulation breakdown fault. To improve the design and operation level of high voltage switchgear, we simulated the electric filed distribution of high voltage switchgear under micro-environment and calculated the minimum discharge distance. Firstly, a multi-physical field finite element simulation model of bus chamber for 40.5 kV high voltage switchgear was established by COMSOL simulation software, and the temperature and humidity distribution in the bus chamber were obtained. The electric field distribution characteristics in the presence or absence of micro-environment were studied by numerical analysis method. Based on the air streamer discharge initiation criterion, the minimum discharge distance in micro-environment was calculated by COMSOL and MATLAB software. Finally, the influence of different insulation partition layout parameters (thickness, location) on the electric field distribution and minimum discharge distance in micro-environment was studied. The results show that the maximum temperature in the bus bar chamber can reach 347.15 K under high temperature and high humidity environment, and the overall temperature presents a gradient distribution of upper and lower. The insulating partition, which is located in the area of low temperature and high humidity, is easy to accumulate wet dirt. In the micro-environment, the electric field at the bus tip and the minimum discharge distance decrease, but the surface electric field increases, and the flashover probability increases.
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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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