超声传感器在电机定子局部放电研究中的应用

摘要

在利用超声波进行发电机定子绕组局部放电的在线监测中,超声传感器的选型、超声波信号的衰减以及时延性都将影响到在线监测的效果.鉴于此,通过将发电机正常运行时的噪声频谱与局部放电超声信号频谱进行分析对比,并建立定子模型,通过仿真实验获取超声波传播时的声压分布图；再通过实验检测对超声信号在传播过程中的衰减与时延性进行分析研究.提出超声传感器的选型依据,并为局部放电的超声波传播特性和局部放电定位的后续研究奠定基础.%During online monitoring using ultrasonic wave for partial discharge of generator stator winding, the effect of online monitoring will be affected by the selection of ultrasonic sensor, the attenuation and time delay of ultrasonic wave signal. The noise spectrum of the generator in normal operation and the partial discharge ultrasonic signal spectrum are compared and analyzed; and the stator model is established. The sound pressure distribution diagram during the ultrasonic wave propagation will be obtained through simulation experiment. The attenuation and time delay of ultrasonic signals propagation are analyzed and studied by the experimental detection. The selection basis of the ultrasonic sensor is put forward. And it laid the foundation for the future studies on the features of ultrasonic wave propagation and the partial discharge location.