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With the acceleration of urbanization, 10 kV distribution cables, as core components of urban power grids, face severe challenges in safe operation. Cable joints are prone to explosion accidents due to electromagnetic-thermal-mechanical multi-field coupling effects, and traditional explosion-proof methods exhibit deficiencies in heat dissipation and stress balance. In this paper, the cable with model YJV22 8.7/15 3×35 mm2 as the research object, and a two-way coupling model of electromagnetic field, temperature field, and solid mechanics field were established to study the temperature and stress distribution patterns of 10 kV cable joints under overload and short-circuit conditions systematically and explore the influences of dimension parameters (radius ratios K1, K2) of the explosion-proof box and sealing materials on explosion-proof performance. The results show that although installing the explosion-proof box impedes heat dissipation, leading to the peak temperature of cable joint rise by about 4℃, while by optimizing the radius ratios (K1) of explosion-proof box to 1.5-1.6 and K2 to 1.6-1.7, the heat dissipation efficiency of cable joint improves significantly and the stress concentration decreases. When the thermal conductivity of the sealing material exceeds 0.5 W/(m·K), the heat dissipation disadvantages of the explosion-proof box can be compensated and the current-carrying capacity increases. Additionally, polyurethane sealant can reduce the stress peak valueof the explosion-proof box by approximately 47 times compared to epoxy resin.
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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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