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In recent years, the continuous increase of voltage levels and operating frequency in the aviation power systems have made aviation cables more prone to arc discharges under low-pressure environments. To systematically evaluate the partial discharge inception voltage (PDIV) characteristics of aviation cables under different voltage parameters and low air pressures conditions, taking the sinusoidal voltages ranging from 50-800 Hz and repetitive square wave pulse voltage as excitation sources, the PDIVs of four kinds of cables discharge models in the air pressure of 20-101 kPa was tested in this paper. The results show that the PDIV under square wave voltage is lower than that under the sinusoidal voltage, indicating that the square wave voltage is more likely to trigger partial discharge, which may be attributed to the sharp increase of the electric field intensity due to its steep rising edge, and the harmonic superposition effect aggravates the electron impact ionization process. Under low pressure, the decrease in molecular density and the increase in electron free path enhance the ionization, resulting in a downward trend of PDIV with the reduction of air pressure and a significant increase in the risk of insulation breakdown. However, the frequency has a relatively small impact on PDIV, because the accumulation and dissipation time of air gap charge is much shorter than the power frequency period, and the discharge is mainly determined by the electric field intensity. Among the four kinds of cable discharge models, the PDIV of the twisted-pair cable discharge model is always the highest. This is due to its double insulation, which significantly increases the equivalent thickness and weakens the air gap electric field, thus exhibiting stronger insulation endurance under both sinusoidal and pulse conditions.
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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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