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The core content of 500 kV DC cable joint design is the performance and geometric structure of reinforced insulation material. In this paper, the electric field distribution characteristics of the main insulation and reinforced insulation double-layer dielectric of the DC cable joint were calculated and simulated. The development mechanism of DC cable joint breakdown caused by interface discharge was analyzed. The breakdown characteristics of the dielectric interface between cross-linked polyethylene (XLPE) and silicone rubber (SR) in DC cable joint were analyzed. The results show that the conductivity of the reinforced insulation and the main insulation of the cable joint and the interface tangential electric field strength are the key parameters of the reinforced insulation design. Within the changing allowance of temperature and electric field, the conductivity of the reinforced insulating material should always be less than that of XLPE. The tangential electric field strength of the interface between the main insulation and the reinforced insulation is the key control parameter affecting the operation reliability of the DC cable joint, and its threshold is 2.5 kV/mm under the most unfavorable conditions. The research results provide a new method to solve the design problems of DC cable joints, especially for the reinforced insulation.
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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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