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Compared with the traditional cable joint, the cable fusion joint has the advantages of no stress cone and no movable interface, which has more promising in the new cable operation project and the old cable reconstruction and maintenance project. In order to evaluate the performance of fusion joint after long-term operation in the power grid, the fusion joint was conducted electro-thermal-mechanical coupling simulation under the operation of power grid. The stress distribution and temperature distribution of cable joint were studied through changing the effective value of operating current and considering the short-time overload and material parameter difference between new and old insulation layer. The simulation results show that the stress distribution at the interface between the old and new insulation layer is uneven when the material parameter difference between the new and old insulation layer increases. The increase of operating current will not only increase the overall temperature of fusion joint, but also increase the stress of insulating layer. The radial stress of short-time overload operation for 1 hour is about 4 times bigger than that of steady-state operation, the axial stress is about 3 times bigger than that of steady-state operation, and the core temperature is about 80 K higher.
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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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