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In areas with large temperature difference between day and night, negative pressure is easy to form in the expander of oil-immersed inverted current transformers, which will affect the distribution of water in the oil-paper insulation, and then affect the insulating properties of the oil-paper insulation system. In this paper, the saturation solubility of water in insulating oil under different pressure and temperature was measured by indirect method. On the basis of the test results, the relationship between the saturation solubility of water in insulating oil and temperature and voltage in Arrhenius equation was fitted by recursive least square method, and the effect law was studied. The results show that with the increase of negative pressure, the water saturation solubility in insulating oil decreases constantly, and this trend becomes more obvious with the increase of temperature. Under the effect of negative pressure, water in the oil separates out and turns into suspended water in insulating oil or transfers to insulating paper. The translation factor n related to pressure was introduced in this paper, and a mathematical expression involving pressure, temperature, and water saturation solubility in oil was established. The acid value, temperature, and pressure were taken as the comprehensive factors to evaluate the water saturation solubility in insulating oil, and the multi factor influence law was established, in which the influence of acid value and pressure can cancel with each other to some extent. The water distribution and insulation state of the oil-paper insulation system for oil-immersed inverted current transformers can be evaluate more accurately by the above research results.
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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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