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Taking 220 kV rod-shaped suspension composite insulator as an example, we conducted simulation and calculation on a 1/4 tower model for 220 kV line composite insulator by the COMSOL multiphysics software, and the influences of the grading rings with different types and structures on the electric field distribution of composite insulator were studied. The results show that the electric field uniformity effect of semicircular grading ring is slightly weaker than that of the tubular grading ring, and the voltage equalizing effect of bird-proof grading ring is basically the same as that of the tubular grading ring installed at low voltage end. The surface electric field intensity of composite insulator decreases with the increase of pipe diameter of high-voltage end or double-end grading ring, and the decline decreases gradually. When the diameter of high-voltage end grading ring increases, the surface electric field intensity of composite insulator decreases at first and then increases. When the diameter of double-end grading ring increases, the surface electric field intensity at high-voltage end decreases at first, then increases and finally decreases, while the surface electric field intensity at low-voltage end keeps increasing. Increasing the covering depth of grading ring at high voltage end can improve the surface electric field at the middle of the composite insulator, and lead to the increase of electric field at the connecting end, which is not conducive to the safe operation of composite insulator.
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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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