为研究变频调速牵引电机的绝缘老化机理，采用高压方波脉冲对变频电机匝间绝缘绞线对试样进行加速老化试验，通过分析不同老化时间下绞线对的电容值和介质损耗因数(tanδ)，对绞线对在高压方波脉冲条件下的绝缘老化机理进行研究。结果表明：随着老化时间的延长，试样电容值逐渐减小，介质损耗逐渐增大。低频时绞线对的介电温度谱在125℃出现一个明显的损耗吸收峰，高频时在85℃出现一个损耗低谷。30℃时绞线对的介电频率谱在10~100 kHz频率段出现损耗峰，峰值随老化时间延长而增大，而在80℃和150℃损耗峰消失，同时tanδ逐渐减小。老化后绞线对绝缘膜的有机相被烧蚀，留下颗粒状的不连续团簇物。
In order to study the insulation ageing mechanism of inverter-fed traction motor, twisted pair samples of interturn insulation for inverter-fed motor were conducted accelerated ageing experiments under high-voltage square wave pulse. The capacitance and dielectric loss factor (tanδ) of the twisted pairs aged for different time were analyzed, and the insulation ageing mechanism of the twisted pairs under high-voltage square wave pulse was studied. The results show that with the ageing time prolong-ing, the capacitance of samples decreases gradually, while the tanδ increases gradually. There is an evi-dent loss peak of the dielectric temperature spectra of the aged samples at 125℃ under low frequency, while there is a valley of the dielectric temperature spectra at 85℃ under high frequency. For the dielec-tric frequency spectra, there is a loss peak in the range of 10 kHz~100 kHz at 30℃, and the peak value increases with the ageing time prolonging. When the dielectric frequency spectra were measured at 80℃and 150℃, the loss peak of dielectric frequency spectra disappears, and the tanδ reduces gradually. The organic phase of insulation film on the aged twisted pair was eroded, and leaving some granular and discontinuous clusters.
参考文献
| [1] | Jeremy C. G. Wheeler.Effects of Converter Pulses on the Electrical Insulation in Low and Medium Voltage Motors[J].IEEE Electrical Insulation Magazine,20052(2):22-29. |
| [2] | Weijun Yin.Failure mechanism of winding insulations in inverter-fed motors[J].IEEE Electrical Insulation Magazine,19976(6):18-23. |
| [3] | Bonnett A.H..Analysis of the impact of pulse-width modulated inverter voltage waveforms on AC induction motors[J].IEEE Transactions on Industry Applications,19962(2):386-392. |
| [4] | 佟来生;吴广宁;林同光;张国钦;刘曦.变频牵引电机定子绕组内部电压分布特性的研究[J].中国电机工程学报,2006(12):134-138. |
| [5] | 万健如;林志强;禹华军.高频PWM脉冲波传输引起电机端子过电压的研究[J].中国电机工程学报,2001(11):43-47. |
| [6] | 佟来生 .变频调速交流牵引电机绝缘电老化机理的研究[D].西南交通大学,2006. |
| [7] | 刘学忠;徐传骧.PWM变频调速电动机端子上过电压的抑制[J].中国电机工程学报,2001(8):84-88. |
| [8] | 吴广宁;周力任;郭小霞;何景彦.采用tanδ表征变频电机绞线对绝缘老化特性的研究[J].高电压技术,2010(7):1625-1629. |
| [9] | Stone G.C.;Sedding H.G..The ability of diagnostic tests to estimate the remaining life of stator insulation[J].IEEE Transactions on Energy Conversion,19884(4):833-841. |
| [10] | 贾志东;郝艳捧;蒋雄伟;谢恒堃;耿瑞香.基于力学损耗和介质损耗参数分析大型发电机主绝缘的老化特征[J].中国电机工程学报,2000(11):1-5. |
| [11] | 欧阳本红;刘丽兵;江裕熬;高乃奎.发电机定子绝缘剩余寿命评估参量的选择[J].高电压技术,2005(1):30-32. |
| [12] | 乐波;张晓红;卢伟胜;蒋雄伟;贾志东;谢恒;宋建成.电机定子线圈绝缘多因子老化特征的研究[J].高电压技术,2000(2):3-7. |
| [13] | Kaufhold M.;Borner G..Failure mechanism of the interturn insulation of low voltage electric machines fed by pulse-controlled inverters[J].IEEE Electrical Insulation Magazine,19965(5):9-16. |
| [14] | 何恩广;刘学忠.纳米TiO2填料对变频电机耐电晕电磁线绝缘性能的影响[J].电工技术学报,2003(1):72-76,42. |
| [15] | 吴广宁;彭佳;刘继午;罗杨;朱光亚;张依强.方波脉冲电压下聚酰亚胺材料的老化特性[J].高电压技术,2014(7):1957-1962. |
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