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Cross-linked polyethylene (XLPE) submarine cable is a key transmission equipment in flexible low-frequency transmission scenarios such as medium and long-distance island transmission and offshore wind-solar new energy power generation. In this paper, XLPE insulated cable was conducted electrothermal ageing tests under low frequency voltage, and the effects of ageing voltage frequency on the electrical properties, mechanical properties, and micro-structure of XLPE insulation were studied. The results show that when the ageing voltage frequency is 10-50 Hz, the AC electric strength, volume resistivity, and elongation at break of XLPE ageing samples increase at first and then decrease with the increase of ageing voltage frequency. The electrical properties of XLPE samples aged under 20 Hz and 30 Hz of voltages are better than those aged under other voltage frequencies. The change trend of crystallinity of XLPE ageing samples with ageing voltage frequency is consistent with the electrical properties. The thermal ageing at lower voltage frequency contributes to the recrystallization of XLPE insulating materials, while the thermal ageing at higher voltage frequency will damage the crystalline structure of the material and increase the proportion of amorphous regions. The research results can provide a reference for the applicability of XLPE insulated cables in low frequency transmission technology.
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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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