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Gas chromatography is a common way to determine the dissolved gas content in insulating oils, but there is many types of natural insulating oil, and the Ostwald coefficient is not clear. In order to be able to accurately calculate the dissolved gas content in natural insulating oils, the Ostwald coefficient of seven typical dissolved gases in four natural ester insulating oils was measured using double equilibrium method and compared with the Ostwald coefficient in mineral oil. The results show that there is little difference on Ostwald coefficient of the seven dissolved gases in the three natural esters, while the Ostwald coefficient of dissolved gas in the modified esters is slightly greater than that in the natural esters. The Ostwald coefficient of dissolved gas in FR3 has little relative error compared with the available data, which proves that the data obtained by the method has good credibility.
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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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