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The oil-paper insulation systems, composed of insulating paper and monoester insulating oil or mineral insulating oil, were conducted thermal ageing tests, the ageing temperature was 130℃ and 140℃, and the ageing atmosphere was nitrogen and air, respectively. The thermal ageing characteristics of two insulation systems were compared. The results show that after the ageing of oil-paper insulation, the acid value and water content of monoester insulating oil are higher than that of the mineral insulating oil. Under the nitrogen atmosphere, the monoester insulating oil can prolong the ageing life of insulating paper significantly compared with mineral insulating oil, but at 130℃, the monoester insulating oil only prolong the ageing life of insulating paper slightly compared with mineral insulating oil. There is little difference between the thermal ageing life of insulating papers in the two insulating oils under air atmosphere.
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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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