Core Loss Measurement of the Ferromagnetic Components Using Low-Frequency Method Frequency Power Supply
Liu Xin1, Yao Chenguo1, Liang Shibin2, Wang Junkai1, Liu Tao3
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2.Yunnan Electric Power Test & Research Institute (Group) Co.Ltd Kunming 650051 China; 3.Yunnan Electric Power Technology Company Kunming 650051 China
Abstract：Transformers will have measured no-load excitation characteristics, no-load loss and load loss for factory tests. Generally, a large capacity of industrial-frequency (IF) power supply is needed to measure the no-load loss which mainly consists of core loss. In order to reduce the capacity of testing power supply and make the test equipment portable, a low-frequency power supply rather than IF power supply which was used for core loss measurement of ferromagnetic components, was demonstrated in this paper. By applying several low frequencies voltages, the cure of E/f-PFe(electromotive force/frequency-core loss) via calculating core loss under low-frequency can be first obtained. Core loss under low-frequency of different frequency at constant value of E/f were then calculated through spline interpolation method. Lastly, the converted core loss under IF was determined based on least square method. In addition, experiments were conducted on the current transformer (CT) and single phase power transformer, comparing conversion results which using 15,20,25 Hz with directly measured results under IF, the relative error ε is below 5% and standard deviation of relative error σε is less than 0.9, respectively. These results show that this method possesses high conversion accuracy and stability and reduces the capacity of testing power supply obviously.
刘鑫, 姚陈果, 梁仕斌, 王俊凯, 刘涛. 铁磁元件铁心损耗的低频测量方法[J]. 电工技术学报, 2017, 32(11): 217-224.
Liu Xin, Yao Chenguo, Liang Shibin, Wang Junkai, Liu Tao. Core Loss Measurement of the Ferromagnetic Components Using Low-Frequency Method Frequency Power Supply. Transactions of China Electrotechnical Society, 2017, 32(11): 217-224.
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2017, Vol. 32 
