软门限小波去噪在变压器冲击试验中的应用研究  

APPLICATION OF SOFT-THRESHOLDING WAVELET DE-NOISING METHOD IN THE DIAGNOSIS OF TRANSFORMER DURING IMPULSE TEST

作　　者：傅晨钊[1] 汲胜昌[1] 李彦明[1] 刘杰[2] 王国刚[2] 

机构地区：[1]西安交通大学,陕西西安710049 [2]沈阳变压器有限责任公司,辽宁沈阳110025

出　　处：《中国电机工程学报》2001年第7期103-106,共4页Proceedings of the CSEE

摘　　要：利用基于小波标架的软门限压缩降噪方法 ,对变压器冲击试验中的中性点电流进行处理。为了验证该方法可以在去噪的同时有效的保留原信号的特征分量 ,进行了模拟故障试验。结果表明这种去噪方法适用于对衰减快、振荡的信号的处理 ,能较好的解决保护信号局部特征与抑制噪声之间的矛盾。In this paper, neutral point current data during transformer impulse tests are analyzed by soft threshold shrinkage de noising method based on wavelet frame. Simulation tests are made to verify that the partial features of the original signal can be reserved after de noising via this method. The simulation results show that this de noising method is applicable to processing the oscillating signal that damps quickly. In addition, it is verified that the conflicts between de noising and reserving the signal's partial features can be solved by this method.

关 键 词：电力变压器 冲击试验 小波分析 软门限 

分 类 号：TM41[电气工程—电器]