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Compared with mineral insulating oil, natural ester has the advantages of higher ignition point, better degradability, and can delay the thermal ageing rate of insulating paper, so natural esters are receving extensive attention as liquid insulating medium for extending the life of transformers or improving short term overload capacity. In this paper, we used rapeseed oil, which accounted for a large proportion of cooking oil in China, to prepare rapeseed oil based natural esters, and the accelerated thermal ageing characteristics of insulating paper with different water contents in rapeseed oil based natural ester and mineral oil were investigated. The effect of oxygen on the accelerated thermal ageing characteristics of insulating paper in the two different insulating liquids was studied. The experimental results show that at the same temperature, water content is the main factor affecting the thermal ageing rate of insulating paper, and oxygen will reduce the inhibitory effect of rapeseed oil based natural esters on the thermal ageing rate of insulating paper with low water content. Combined with the measured data of specific strength and degree of polymerization of insulating paper during thermal ageing in insulating liquid, a kinetic model of cellulose decomposition reaction rate of insulating paper considering the influence of water content and oxygen was established. The model can be used to predict the thermal ageing process of insulating paper in insulating liquids.
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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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