电力系统及其自动化学报2013，Vol.25Issue(2)：77-82,6.
变压器绕组短路振动信号的高低频能量分析
Analysis on High and Low Frequency Energy Distribution of Transformer Winding Short-circuit Fault Vibration Signal
摘要
Abstract
This paper makes a theoretical analysis of transformer vibration and conducts experiments on a transformer for several times under the normal condition and winding short-circuit condition. The winding short-circuit is a man-made fault in this experiment. A new method based on the wavelet-envelop spectrum energy distribution for extracting the vibration signals characteristics and establishing the threshold of winding short-circuit fault is presented. Firstly, the vibration signals are denoised by the method of wavelet transform. Then the envelope spectra of low frequency and high frequency signals are extracted by wavelet transform combined with Hilbert transformation. Lastly, the spectral analysis and energy characteristics extraction for envelope signals are completed, and the energy distribution are compared on the normal condition and short-circuit condition. The threshold of transformer winding short-circuit fault is obtained through the experiments and the results show that this method can be used to monitor and diagnose the transformer winding short-circuit fault.关键词
变压器/振动/绕组短路/小波变换/包络谱Key words
transformer/ vibration/ winding short-circuit/ wavelet transform/ envelope spectrum分类
信息技术与安全科学引用本文复制引用
王春宁,张赢,陈楷,马宏忠..变压器绕组短路振动信号的高低频能量分析[J].电力系统及其自动化学报,2013,25(2):77-82,6.基金项目
国家电网公司科技资助项目(2011-0810-2251) （2011-0810-2251）
