New Method to Identify Transformer Inrush Current Based on FFT and SVM
To improve transformer longitudinal differential protections reliability,this paper deeply analyzes generation mechanism and characteristic of transformer inrush current,and uses PSCAD/EMTDC software to simulate 188 kinds of transformer operation states.They are including internal fault current,inrush current and no-load closing with internal fault.On the background of those simulations,it proposes a simple and accurate method to identify inrush current based on SVM.SVM selects Gaussion Kernel,and takes three-phase differential current,fundamental,secondary harmonic and third harmonic as characteristic quantities.Many cross-validation results verify that the training SVM has high accuracy.This method can identify inrush current and internal fault current (including no-load closing with internal fault current) rapidly and accurately.It takes less time,and is easy to perform.
FFT SVM transformer protection inrush current internal fault current
Maofa Gong Guoliang Li Wenhua Xia Honglin Yan Jingwen Qu Xiaoyu Wang
Shandong University of Science and Technology,Qingdao,Shandong Province,China
国际会议
济南
英文
887-890
2012-12-29(万方平台首次上网日期,不代表论文的发表时间)