张重远,胡焕,程槐号,刘云鹏.基于窗口计算法和费希尔判别法的变压器绕组变形诊断新方法[J].电测与仪表,2018,55(9):77-83. Zhang Zhongyuan,HuHuan,CHENG Huaihao,LIU Yunpeng.A New Method to Diagnose Winding Deformation in Transformer Based on Windowed Calculation and Fisher Discriminant Analysis[J].Electrical Measurement & Instrumentation,2018,55(9):77-83.
基于窗口计算法和费希尔判别法的变压器绕组变形诊断新方法
A New Method to Diagnose Winding Deformation in Transformer Based on Windowed Calculation and Fisher Discriminant Analysis
In order to improve the ability of monitor for winding deformation of transformer by frequency response analysis method , windowed calculation was proposed in this paper for improving traditional correlation coefficient method and diagnosed the fault type combined with fisher discriminant analysis. Firstly, a window with specified length is moved from the beginning to the end of frequency band of transfer function and scans the total frequency range of the transfer function with a desired step. At each step, the correlation coefficient are calculated at the window length frequency region and the calculated indices at each step can be used as a feature of frequency response curve after winding deformation. At last, because of the ability of the Fisher Discriminant Analysis for maximizing the between class separability while minimizing their within-class variability, Fisher Discriminant Analysis was utilized for dimension reduction from a lot of calculated features by the proposed method and pattern recognition for winding deformation.
