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In order to study the effect of coating silicone grease on the distribution of multiple physical fields at the crosslinked polyethylene/silicone rubber composite interface under thermal ageing, the electrical-thermal-mechanical multi-physics field model of 110 kV cable terminal joints was established using COMSOL Multiphysics software. The distribution of electric field, temperature field, and stress field at the composite interface before and after coating silicone under thermal ageing was simulated. The results show that after coating with silicone grease, the sealing degree of the interface increases, which decreases the distortion degree of the electric field and leads to the slight decrease of the temperature rise of the interface, but the stress of the interface distributes unevenly. After ageing, the swelling of silicone grease on silicone rubber increases the relative dielectric constant of silicone rubber, and the interfacial charge density, and causes the electric field strength increase further. The increase of temperature promotes the penetration of silicone grease to silicone rubber, which decreases the thermal conductivity of silicone rubbe and make the interface temperature higher than that before ageing. Under thermal ageing, the elastic modulus of the silicone rubber coating with silicone grease decreases significantly and the interfacial stress decreases further.
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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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