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To systematically investigate the short-term and long-term DC voltage endurance characteristics of polypropylene (PP) materials, we took PP sheet specimens as the research object and tested their DC breakdown strength at different temperatures and thicknesses. Through linear voltage ramp and stepwise voltage ramp tests, the effects of voltage application method and ramp rate on the DC breakdown strength of the specimens were studied. On this basis, combined with the breakdown test data under constant voltage, the DC voltage endurance coefficients of the material determined by different voltage application methods were compared, and the applicability of each method was analyzed. The results show that as the temperature increases, the DC breakdown strength of the PP specimens decreases, which conforms to the Arrhenius equation. As the specimen thickness increases, the breakdown strength decreases following an inverse power law. The faster the voltage ramp rate, the higher the measured DC breakdown strength. As the voltage application time increases, the breakdown strength of the specimens decreases. The DC voltage endurance coefficient of the PP material determined by the inverse power law of electrical ageing based on the data from the constant voltage method and the stepwise voltage ramp method is approximately 13.
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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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