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Metallized polypropylene film capacitor has the characteristics of high reliability, self-healing, and low dielectric loss. However, it needs to withstand the combined action of strong direct current electric field and high temperature thermal field for a long time during the working process, which makes the space charge easy to accumulate inside the polypropylene dielectric film, resulting in the degradation of its electrical insulating properties. A self-healing model of metallized polypropylene film was established in this paper. The changes of self-healing area at the self-healing point under different self-healing development time and applied voltage were studied through the evaporation model of metal layer, and the changes of space charge density in the discharge channel under different self-healing development time, applied voltage, and temperature were studied by using the bipolar carrier transport model, so as to explore the microscopic mechanism of self-healing of metallized polypropylene film. The results show that there is a linear relationship between the evaporation area of metallized film and the self-healing development time. With the increase of the applied DC voltage and temperature, the charge migration process in discharge channel strengthens, and the electrons and holes in discharge channel are more likely to migrate and recombine with the charges of opposite polarity. With the self-healing process progresses, the charge amount injected into the discharge channel increases gradually, and the migration of charge to both ends of the discharge channel intensifies, resulting in uneven potential distribution in discharge channel and the electric field will distort in discharge channel.
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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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