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The environment-friendly insulating fluid for transformer has developed rapidly in recent years, insulating liquids such as natural ester, synthetic ester, and modified ester have become the research focus of new insulating material for transformer. With their applications in 110 kV and above transformers, the dissolved gas analysis (DGA) fault diagnosis method of mineral oil filled transformer is no longer suitable for the ester insulating liquid filled transformer. In this paper, a thermal fault simulation system with temperature difference between copper and liquid was designed to simulate the low temperature thermal fault. The soybean, rapeseed, camellia based natural ester, synthetic ester, and palm based modified ester insulating liquids were used as research object, the experimental results of dissolved gas in pure liquid and liquid-paper insulating system under 200℃ and 300℃ low temperature thermal fault were analyzed, and the applicability of the IEC ratio method and Duval pentagon method were discussed. The results show that the IEC ratio method is still applicable to 200℃ and 300℃ low temperature thermal fault diagnosis of natural esters and synthetic ester. The Duval pentagon method can be used to recognize the low temperature thermal fault of natural esters and synthetic ester after adjustment. However, the DGA results of modified ester are inconsistent to those of mineral oil and natural esters, and the Duval pentagon method based on mineral oil is not suitable for the low temperature thermal fault diagnosis of palm based modified ester.
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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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