基于小波消噪的汽轮发电机转子匝间短路在线检测

The Study of On-line Checking Methods Based on Wavelet Noise Elimination Method of Interturn Short-circuit in Turbogenerator Rotor

本文将小波消噪法应用于汽轮发电机转子绕组匝间短路故障信号的处理中。在发电机负载运行的工况下,利用小波分析方法并结合发电机的特点和感应电势信号中各种信号的特征及频率范围,对探测线圈上测得的感应电势信号进行消噪处理。试验表明,该方法可以有效地实现对故障信号的消噪处理,适合于发电机转子绕组匝间短路故障的在线检测。

In this paper, a wavelet noise elimination method is applied to fault diagnosis of interturn short -circuit in turbogenerator rotor windings. While the generator is operation with load, EMF signals on detecting coil are treated with noise elimination by using wavelet analysis method and combining all signals characteristics and frequency scopes of it. Practical examples have shown that this method is effective to realize noise elimination and applicable to on-line checking for interturn short-circuit in turbogenerator rotor windings.