Groundwall insulation damage localization of large generator stator bar using an active Lamb waves method
Groundwall insulation damage localization of large generator stator bar using an active Lamb waves method
复制标题
使用主动兰姆波方法定位大型发电机定子线棒的接地绝缘损坏
DOI：
10.1109/tdei.2017.005742
复制
发表时间：
2017-06
影响因子：
3.1
通讯作者：
Guo Qiyi
中科院分区：
文献类型：
--
作者：
Li Ruihua;Li Hao;Hu Bo;Guo Qiyi
定子绝缘状态监测对大型发电机的可靠运行具有重要意义。然而，使用现有方法定位定子线棒中的接地壁绝缘损坏是困难的。针对这一问题，提出了一种基于主动兰姆波的接地墙绝缘损伤定位方法。两个压电（PZT）换能器安装在定子线棒的表面上;一个PZT作为致动器产生兰姆波，另一个作为接收器捕获传播的兰姆波。然后，使用与互相关函数相关联的希尔伯特变换来提取损伤散射波的飞行时间。在此基础上，建立了定子线棒绝缘损伤的一维定位模型。该方法已被实验验证，通过检测从18 kV/300 MW发电机拆除的槽和端部绕组定子线棒的绝缘损伤。结果表明，该方法能有效地定位定子线棒绝缘损伤，且精度较高。此外，该方法具有良好的噪声鲁棒性，以避免干扰。
Condition monitoring of stator insulation is significant for reliable operation of large generators. However, locating groundwall insulation damage in a stator bar using existing methods is difficult. A new groundwall insulation damage localization method based on active Lamb waves is proposed in this study to address this issue. Two piezoelectric (PZT) transducers are mounted on the surface of a stator bar; one PZT works as an actuator to generate Lamb waves and the other works as a receiver to capture the propagated Lamb waves. The Hilbert transform associated with a cross-correlation function is then used to extract the time of flight of the damage-scattered wave. Consequently, a one-dimensional location model is established to determine the insulation damage position in stator bar. The proposed method has been experimentally verified by detecting insulation damages in both the slot and end-winding stator bars dismantled from a 18 kV/300 MW generator. Results show that the proposed method can effectively locate insulation damage in stator bars with high precision. In addition, the proposed method exhibits good noise robustness to avoid interference.
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