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Moisture intrusion and residual conductive particles are common defects in the joints of tubular insulated busbars in substations. These defects would cause distortion of electric field distribution at the joints, endangering insulation performance and potentially leading to insulation breakdown, burning, and other accidents. In this paper, finite element multi-physics simulation technology was used to construct a joint model of tubular busbar with wrapped insulation material based on the actual structure. Three types of water films, with 10, 30, and 50 mm of lengths, and semi-circular conductive impurities with 0.5 mm of radius, were placed at the interfaces between the metal shielding layer and the main insulation layer, as well as between the main insulation layer and the inner sealing layer. COMSOL software was used to conduct electric field simulation analysis, and the impact of different defects located at various interfaces on the electric field distribution of tubular insulated busbar joint was studied. The results show that both water films and conductive impurities can impact the electric field distribution at the insulation layer interfaces to different degrees. The electric field strength inside the defects decreases, while the electric field strength at the defect edges increases dramatically. Among these, the electric field distortion with conductive particles at the insulation interface is more severe than that with moisture intrusion, making insulation breakdown faults more likely. Therefore, it is crucial to enhance the end sealing and strictly prevent the presence of residual conductive particles.
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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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