摘要
绕组变形是变压器常见的故障类型之一,脉冲频率响应分析法作为一种近年来新兴的检测方法,具有实现在线检测绕组变形的潜力。然而,现有脉冲频率响应分析法从暂态检测信号获取频率响应曲线,大多直接采用快速Fourier变换,实际上并不适合处理暂态突变信号,现场实测结果也发现由Fourier变换得到的频响曲线易受噪声影响。为此,提出基于连续小波变换获取变压器绕组的脉冲频率响应曲线,对变压器绕组等效电路模型进行仿真分析,证实小波变换方法的可行性和有效性,变压器实测分析证实小波变换方法相比快速Fourier变换具有优越性。
Winding deformation is one of the common fault types of transformer,impulse frequency response analysis has recently conducted as a newly developing detection method,and reached potential for realizing online detection of winding deformation.However,the most existing impulse frequency response analysis methods are normally based on fast Fourier transform when they are used for obtaining the impulse frequency response signature from transient signals.Actually,this method is not suitable for processing transient signals,and it is discovered that the frequency response signature based on Fourier transform obtained from field test is easily influenced by the noise.Thus,the method of obtaining the impulse frequency response signature of transformer winding based on continuous wavelet transform algorithm is proposed.The feasibility and effectiveness of the proposed method is verified by the simulation of winding equivalent electrical model.The transformer experiments validate that the wavelet transform method shows superiority than fast Fourier transform.
作者
廖巨成
王晓峰
徐菁
陈攀
赵仲勇
LIAO Jucheng;WANG Xiaofeng;XU Jing;CHEN Pan;ZHAO Zhongyong(State Grid Chongqing Electric Power Company Jiangbei Power Supply Bureau,Chongqing 401147,China;College of Engineering and Technology,Southwest University,Chongqing 400715,China)
出处
《电气应用》
2019年第12期121-127,共7页
Electrotechnical Application
基金
中央高校基本科研业务费资助(SWU118031)
关键词
频率响应
变压器
绕组变形
脉冲
FOURIER变换
小波变换
frequency response
transformer
winding deformation
impulse
Fourier transform
wavelet transform
