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The cable joint interface is easy to discharge along the surface, which would lead to insulation failure, making it become the weakest link in the power cable system. In this paper, the effects of different interface roughness, pressure, and temperature on the AC breakdown voltage of the silicone rubber/polyethylene double-layer dielectric interface were investigated, and the interface discharge channels after breakdown were analyzed. The results show that the interface breakdown voltage at room temperature is related to the interface roughness. The higher the interface smooth degree, the higher the interface breakdown voltage, and the smaller the interface carbonization area. The bigger the interface pressure, the higher the interface breakdown voltage, while the interface carbonization area increases at first and then decreases. With the increase of temperature, the interface breakdown voltage decreases, but the breakdown voltage at higher temperature does not decrease significantly. In addition, the interface carbonization area increases at first and then decreases with the increase of temperature, and the change of interface contact state at different temperatures is one of the main reasons affecting its properties. The interface state of cable accessories has a significant impact on their interface breakdown characteristics, which should be paid attention to during cable operation and maintenance.
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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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