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Basin insulator is the core component of gas insulated metal transmission line (GIL) equipment. A large amount of charge will accumulate on the surface of insulators under long-term effect of unipolar DC electric field, resulting in the electric field distortion at the solid-gas interface, which leads to surface flashover of insulators easily and reduces the insulation performance of equipment. On the basis of relevant research results of DC insulators, this study restrains the accumulation of surface charges by reasonably controlling the surface field strength of insulators and increasing the resistivity of insulating materials. The structure design was optimized by simulation methods, and the insulator was prepared by casting, then dielectric tests and mechanical performance tests under AC and DC stress was carried out and passed, which verified the correctness of design.
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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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