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To investigate the influence of water on the breakdown position of oil-filled cable terminal, this study simulated and analyzed the failure reason caused by water in the 220 kV oil-filled cable terminal. A cable test platform was established in the laboratory, and the influence of the grounding state and electric field strength on the breakdown position was simulated. The partial discharge (PD) quantity and water film height of the cable in different grounding states and at different electric field strength were recorded by using high frequency current partial discharge detector and camera. The results show that the water content in oil, grounding state, and electric field strength are the important factors affecting the fault location of oil filled cable terminal. When the water is immersed in the cable terminal and reaches a certain amount, and the cable terminal is directly grounded, the higher the electric field strength, the more water molecules escape from the oil-water interface, the higher the water film height, the longer the distance between the breakdown point and the upper surface of stress cone, and the larger the partial discharge. The intensity of PD is positively correlated with water film height, and the silicone oil degradation defects within the cable terminal can be evaluated by partial discharge, which provides a reference for evaluating the insulation status of oil-filled cable terminal.
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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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