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Compared with mineral insulating oil, natural ester insulating oil has the advantages of high biodegradability, non-toxicity, and strong fire resistance, which has the potential to replace mineral insulating oil in power transformer. A set of lightning impulse discharge characteristics test system including high-speed image acquisition system, test power supply, and electrical signal measurement system was established. The positive and negative lightning impulse discharge characteristics of palm insulating oil and mineral insulating oil were tested, and the stop length, development velocity, and gap breakdown characteristics of the streamer in two oils under positive and negative lightning impulse were compared and analyzed. The results show that under the same applied voltage and polarity, the streamer stop length in palm insulating oil is longer and the streamer development velocity is faster compared with the mineral insulating oil. The contents of vitamin A and vitamin E in palm insulating oil have no effect on the streamer stop length, development velocity, and breakdown voltage. The differences of streamer development characteristics and breakdown characteristics under positive and negative voltages mainly comes from the influence of space charge in insulating oil on the streamer development process.
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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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