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The invasion of moisture at the insulation interface of cable accessories is the main cause of electrical breakdown and insulation failure. However, the effect mechanism of moisture on interface discharge and breakdown remained unclear. Therefore, this paper conducted experiments and simulations to analyze and study the causes of breakdown failure at the insulation interface of cable accessories under the influence of moisture. First, the discharge evolution characteristics during the breakdown process at dry and humid interfaces were described through experiments. Subsequently, by combining discharge products with electric field analysis, the effect mechanism of moisture on the breakdown development at the interface was explained. Finally, a field case was presented to confirm the validity of the proposed breakdown mechanism of the insulation interface under the influence of moisture. The results show that the discharge process during the interface breakdown of insulation interface develops in stages, accompanied by gas generation. The bubbles regions formed by the generated gases lead to severe electric field distortion, which reduces the electric strength of the interface. The dynamic motion of the bubbles also increases the randomness of interfacial discharge, causing the interfacial breakdown process to be accompanied by multiple discrete arc discharges along random path.
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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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