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The electric field strength and potential distribution of insulator strings with different locations, numbers and deterioration degrees of insulators were studied by finite element method. The results show that the deteriorated insulators at high and low voltage terminals has the greatest effect on the axial electric field of the insulator string, which significantly increases the peak amplitude of electric field at the deterioration location. Compared with the insulator string with a heavily deteriorated insulator, the electric field peak near the second insulator is greatly affected by the presence of two (first and second) deteriorated insulators. When the number and location of insulator degradation are the same, the effect of slightly deteriorated insulator on the axial electric field strength of insulator string is the same as that of zero value insulator, but the influence degree increases with the increase of degradation degree.
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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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