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In view of the problem of uneven electric field distribution and severe local electric field distortion in insulation partitions of high-voltage switchgear, dielectric functional gradient materials were introduced into the preparation of insulation partitions, and two optimization schemes, which are internal insulation structure optimization and surface insulation structure optimization, were proposed. By changing the upper limit of dielectric constant of material, the thickness of insulation partition, and the thickness of surface coating, electric field and temperature field simulation calculations were carried out to compare and analyze their effects on the optimization of electric field distribution. Finally, simulations and dielectric loss characteristics tests were conducted to compare the two optimization schemes. The results show that compared to the traditional homogeneous insulation partitions, changing the internal insulation structure and adding surface coatings can reduce the maximum field strength along the surface without considering the influence of internal operating environmental factors in the switchgear. When the thickness of insulation partition increases to 12 mm, the electric field optimization effect is optimal, and the maximum field strength along the surface can be reduced by 69.8%. When the surface coating thickness is 1 mm, the electric field optimization effect is optimal, and the maximum field strength along the surface can be reduced by 62.9%. Through simulation and experimental comparison, it is proved that the partition with optimized internal insulation structure has better electric field control effect and insulation performance.
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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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