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In this paper, a very fast transient overvoltage (VFTO) discharge simulation experiment platform was established. The effect of VFTO on power equipment was simulated by multiple lightning shock waves, and the effect of discharge amplitude on the electrical insulation performance of ethylene propylene diene monomer (EPDM) was studied. The results show that after 200 times of pulsed discharges, carboxylate salt groups are formed on the EPDM surface, and the dielectric constant and dielectric loss factor increase, while the AC electric strength and surface water contact angle decrease significantly. The degradation degree of above performance increases with the increase of discharge electric field strength. When the field strength reaches 40 kV/mm, the AC electric strength of the EPDM sample decreases from 42.28 kV/mm to 37.16 kV/mm after 200 times of pulse discharges, with a decrease of 12.11%, and the water contact angle decreases from 100.53° to 88.63°.
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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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