发电机线圈轴线磁场漏洞区域检测方法仿真  

Magnetic Field Generator Coil Axis Hole Area Simulation Test Method

作　　者：陆苗霞[1] 

机构地区：[1]南京审计大学金审学院,江苏南京210023

出　　处：《计算机仿真》2016年第11期443-446,共4页Computer Simulation

摘　　要：发电机定子端部线圈引出线受到电磁力的作用而振动,容易产生发电机短路事故,因此需要进行发电机线圈轴线磁场漏洞区域。但是采用当前的方法进行区域检测时,无法抵御电枢反应和噪声等因素的影响,存在难以实现对漏洞区域的定位和检测。为此,提出一种基于小波消噪的发电机线圈轴线磁场漏洞区域检测方法。该方法融合于小波变换理论提取发电机线圈上不同类型感应的电势信号的特征和其频率范围,对探测线圈上测得的信号进行消噪处理,组建发电机线圈轴线磁场模型,计算出轴线气隙磁通密度,利用线圈轴线磁场漏洞区域所对应的端部漏磁频率特征判断磁场漏洞区域的通入反向电流所产生的磁动势,从而完成了对发电机线圈轴线磁场漏洞区域检测。实验仿真证明,所提方法检测精确度高,适用于发电机线圈轴线磁场漏洞区域的在线检测。The coil outgoing line of generator stator end vibrates under the effect of electromagnetic force. It leads to generator short-circuit accident easily. Therefore, it is necessary to detect the magnetic field loophole area of generator coil axis. However, current method cannot resist the influence of factor of armature reaction and noise. It cannot achieve the detection and location of loophole area. Thus, in this paper we proposed a detection method for magnetic field loophole area of generator coil axis based on the wavelet noise reduction. Firstly, the method extracted different types of feature of inductive potential signal and its frequency domain in generator coil integrated with the wavelet transformation theory. Then, it made de-noising process for the measured signal in exploring coil to build the magnetic field model of generator coil axis and work out the air-gap flux density of axis. Moreover, it used the feature of end magnetic flux leakage frequency corresponding to the magnetic field loophole area of generator coil axis to judge the magneto-motive force of magnetic field loophole area generated by the reverse current. Finally, it completed the detection for magnetic field loophole area of generator coil axis. The simulation results show that the method mentioned above has higher detection precision. It is appropriate for online detection on magnetic field loophole area of generator coil axis.

关 键 词：发电机 线圈轴线 漏洞区域检测 

分 类 号：TM311[电气工程—电机]