An Approach to Identify Magnettizing Inrush Currents and Its Simulation
Power transformer is one of the main electrical equipments. It is the important for the system to run safely and economically. When the short circuit takes place between the internal coils, power transformer different protection works correctly; while the external short circuit fault and over excitation appear, it does not process trip. The distinguishing internal fault current from magnetizing inrush current of power transformer is still the key issues of differential protection of power transformer. The wavelet analysis has the characteristic of multi resolution analysis and good time and frequency domain localization, fits to extract sudden change signals in transient processes, and detects irregularity of signals very well. This paper describes a method for discrimination between internal faults and magnetizing inrush currents in power transformers using the wavelet transform. The experiment simulation shows that the proposed method is more reliable and simpler, and is suitable for different power transformer systems.
internal fault magnetizing inrush current wavelet transform simulation
Yang Long
School of Computer and Information Engineering,Harbin University of Commerce,Harbin China
国际会议
哈尔滨
英文
2377-2380
2011-08-12（万方平台首次上网日期，不代表论文的发表时间）