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In order to evaluate the application potential of environmentally friendly polypropylene materials in high-voltage cable accessories, the electrical properties include electric strength, space charge distribution, and polarization current of novel polypropylene insulating material and silicone rubber under typical operating conditions were studied to assess their voltage withstand capability, charge accumulation behavior, quasi-steady-state polarization current. At the same time, a 110 kV cable joint simulation model was established using finite element simulation software to simulate the electric field distribution at the joint, and the application performance of polypropylene/silicone rubber composite insulation in high-voltage AC cable joints was explored. The results show that the novel polypropylene exhibits excellent electric strength, although the electric strength decreases with the increase of temperature, it still remains 88.80 kV/mm at 90℃. The electric strength of the polypropylene/silicone rubber composite insulation is primarily influenced by the silicone rubber, but it exhibits good thermal stability and maintains 39.70-47.01 kV/mm within 30-90℃. Space charge test reveals that the polypropylene still has significant charge suppression ability under 20 kV/mm, which can effectively improve the electric field distortion at the composite interface. Calculation based on simulation model indicates that the internal electric field distribution in the 110 kV cable joint using this composite insulation is reasonable, and the maximum electric field strength at the polypropylene/silicone rubber interface is only 5.7 kV/mm, which is far lower than its electric strength. The research has confirmed that the reliability of the novel polypropylene/silicone rubber composite insulation structure meets the operational requirements of high-voltage cable joints.
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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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