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To investigate influence of high-altitude environment on the electrical ageing performance of the main insulating material of new energy vehicle (NEV) drive motor, NHN insulating paper was selected as the main research object. According to the actual working conditions of NEV, the NHN insulating paper was applied bipolar repeated square waves, and its partial discharge inception voltage (PDIV) under different air pressures was measured. The PDIV value under standard atmospheric pressure was used as standard voltage, and 1.5 times of standard voltage was applied to the samples under different air pressures. The physical and electrical parameters of the samples under the condition of electrical ageing for 30 minutes and ageing to breakdown were measured, and the ozone content generated during the electrical ageing process was detected. The results show that the PDIV value of the main insulation sample decreases significantly under low pressure, and when the applied voltage is greater than the PDIV, the sample surface is corroded more severely compared with the plain area, leading to the sample break down easier. During the electrical ageing process with the same time and voltage, the electrical parameters of the samples under low pressure have bigger change, the ozone production rate of partial discharge is faster, the corrosion of the material is intensified, and the deterioration of insulating properties is more serious. Based on above studies, the influence of altitude factors on the corona resistance performance of insulating materials should be fully considered when designing the insulation system of motor for NEV.
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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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