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In order to compare the discharge characteristics difference of metal particles and bubbles in flowing transformer oil, the flowing oils containing impurities were conducted partial discharge (PD) and breakdown experiments on a simulating experiment discharge platform. The waveforms of discharge signals were compared, and the phase resolved partial discharge (PRPD) maps were established. The results show that there are significant differences between the discharge characteristics of two defects in flowing oil. The metal particle PD can excite ultra high frequency signals, while the bubble PD can only excite very high frequency signals. The metal particle PD covers all the power frequency cycle, and the bubble PD distributes in the power frequency negative half cycle (236°-305°) mainly. Compared with metal particles, the effect of bubbles on the breakdown voltage of transformer oil is more serious.
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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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