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The simulation model of 35 kV prefabricated cable terminal was established to simulate and calculate the electric stress, thermal stress, and mechanical stress distribution of the cable terminal under the impulse voltage. The electric field, temperature, and stress of body insulation, semi-conductive layer, and shielding layer were calculated and analyzed, and the influence of harmonic wave with different frequency on the electric field distribution was considered. The results show that the influence of high frequency signal on permittivity does not lead to large distortion of electric field intensity, and the change of electric field intensity is not obvious. At the same time, the temperature rise of cable terminal caused by impulse voltage is small, and its influence can be ignored. The impulse voltage increases the mechanical stress at the intersection of the semi-conductive layer and the stress cone, and the maximum radial strain reaches to 2.54%, which makes the position of the semi-conductive layer prone to produce air gap and is the main cause of cable terminal damage. It is concluded that not only the electric field optimization but also the elastic strain of the material should be considered in the material selection and structural design.
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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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