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A transformer oil circulating flow device was established, the flow transformer oil containing metal particles was conducted partial discharge (PD) experiment, and the PD characteristic parameters were extracted. By combining with the movement behavior of metal particles in flow transformer oil, the influence mechanism of electrode covering paper on the PD of metal particle in flow transformer oil was discussed. The results show that when the electrode is covered with paper, the partial discharge initial voltage (PDIV) increases, and the discharge amplitude and frequency decrease. When the double electrodes are bare or only the lower electrode is covered with paper, the discharge concentrates in two phase sections of 0°-90° and 300°-360°. When the two electrodes are covered with paper, the discharge phases concentrate near 45° and 160° mainly. The metal particles will be settled on the paper because of the existence of insulating paper and lead to the increase of horizontal distance between two adjacent collision points. In addition, after the electrode is covered with paper, the electric field in the oil will decrease, which makes the vertical velocity of the particles decrease and the collision frequency between particles and electrodes decrease, resulting in the decrease of PD strength and change of the discharge phase distribution.
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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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