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High-power air-insulated RF coaxial cable has a broad application prospect in the field of Internet of Things. It is of great significance to study the electric field distribution of its important insulating component—insulating gasket in the presence of common defects for the safe and stable operation of RF coaxial cables. Firstly, a numerical model of RF coaxial cable containing inner and outer conductors and insulating gaskets was established and a simulation model of electrostatic field was constructed in finite element software, and the accuracy of the model was verified through experiments. Secondly, on the basis of constructed model, the effects of internal air bubbles, surface foreign objects, and interface defects on the electric field distribution of insulating gaskets were studied by adjusting the morphology and positional parameters of defects, and compared with the simulation results of electric field intensity in the absence of defects. The results show that the electric field distribution of the insulating gasket is related to the morphology of internal bubbles, and the closer the distance from the inner conductor, the more serious the electric field distortion; the size, location, and arrangement of the surface foreign objects will affect the electric field distribution, and the influence of conductive particles on the electric field is larger than that of sand particles; the interface defects have a negative correlation with the thickness of defects, and have a positive correlation with the depth of defects. In summary, it is surface foreign object leading to the most serious electric field distortion in three kinds of defects, followed by interface defect.
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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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