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In order to select an appropriate cable joint insulating materials to improve the electric field distribution in joint, the effects of the conductance temperature and field strength dependence characteristics of silicone rubber of common joint insulating material on the electric field distribution in prefabricated joint of XLPE DC cable were studied. Firstly, a simulation model was constructed according to the prefabricated joint structure of 10 kV XLPE insulated DC cable. Secondly, through changing the conductance nonlinear characteristic parameters of silicone rubber, the electric field distribution in the joint insulation with full load condition was obtained. The results show that with the increase of the conductance activation energy or the decrease of the conductance field strength dependency coefficient of silicone rubber material, the field strength at the joint insulation interface increases, and the field strength at stress cone root increases obviously. From an economic point of view, the recommended values of the ratio of conductance activation energy of silicone rubber and XLPE insulating materials and the ratio of their conductance field strength dependency coefficient are not higher than 0.95 and not lower than 0.50, respectively, which can provide reference for the selection and determination of suitable joint insulating materials in engineering.
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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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