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In order to reveal the ageing characteristics of metallized film capacitor under ultra-high DC field, the capacitor and its dielectric material were studied. On the basis of the practical working conditions of capacitor, the special designed capacitor elements were conducted ageing tests at 60℃ under the DC field of 0En, 1.4En, 1.5En, and 1.6En, respectively. The capacity of the capacitor elements during ageing and the base film (biaxially oriented polypropylene (BOPP) film) after ageing failure were tested. The results show that the failure mechanism of the capacitor is related to the ageing electric field, and there is an electric field threshold. When the ageing electric field is lower than the electric field threshold, the capacitor will go through a long-term failure, and its capacitance decreases affected by the performance degradation of film, the electrical strength of the film decreases with the decrease of the activation energy of molecular segment motion. When the ageing electric field is higher than the electric field threshold, the capacitor will go through a short-term failure, and the extremely high electrical stress causes the original weakness to break down rapidly, the self-healing area increases rapidly, so the equipment life is greatly shortened.
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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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