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The domestic and imported 220 kV cross-linked polyethylene (XLPE) cable insulation were carried out accelerated thermal ageing tests at 90℃ and 135℃, and the effects of thermal ageing with different temperature and different time on the physical and chemical properties, mechanical properties, and electrical properties of XLPE insulation were investigated. The thermal ageing life of domestic and imported XLPE insulation were evaluated. The results show that the oxidation reaction induced by thermal ageing leads to the appearance of carbonyl peak in the XLPE sample, and the higher the ageing temperature, the more obvious the carbonyl peak. After ageing, the cross-linking degree of XLPE samples increases, which damages the crystal structure in the crystallization zone and decreases the crystallinity, resulting in the overall deterioration of mechanical properties. The molecular chain of the aged sample is broken and degraded, and the movement of carrier is intensified under the action of electric field, resulting in the decline of AC electric strength. The thermal ageing life evaluation shows that the thermal ageing life of domestic XLPE insulation material is greater than that of imported XLPE insualtion material. The comprehensive comparison of various properties shows that the level of domestic XLPE insulation material is equivalent to that of imported XLPE insulation material.
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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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