Residual Flux Measuring Method on the Core of Ferromagnetic Components Based on Alternating Polarity DC Voltage Source
Liu Tao1, Liu Xin2, Liang Shibin3, Wang Junkai2, Yao Chenguo2
1. Yunnan Electric Power Technology Company Kunming 650217 China; 2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 3. Yunnan Electric Power Test & Research Institute Co. Ltd Kunming 650217 China
Abstract：Residual flux may cause strong inrush current on transformers and affect measuring accuracy of current transformer (CT). Nowadays, measurement of residual flux of transformer core, however, is not standardized. Owing to the convenience of residual flux measurement, alternating polarity DC voltage source, which is used for characterizing residual flux and magnetic remanence coefficient of ferromagnetic core, is demonstrated in this paper. By applying alternating polarity DC voltage generated by half-bridge circuit on windings, negative and positive saturation points of ferromagnetic core are reached, respectively. The saturated part of hysteresis loop is obtained via plotting magnetic flux-current curve during the whole process. Residual flux and magnetic remanence coefficient are then calculated based on the obtained hysteresis loop. In addition, investigation was conducted on the current transformer, and residual flux was measured on positive and negative saturation points along with zero flux point. The average values are 4.001mWb, -3.844mWb and 0.048mWb, respectively. These results show high accuracy and stability of this method. Besides, the rated power of demagnetization voltage source is low which makes the demagnetization devices more portable.
刘涛, 刘鑫, 梁仕斌, 王俊凯, 姚陈果. 基于极性变化直流电压源的铁磁元件铁心剩磁通测量方法[J]. 电工技术学报, 2017, 32(13): 137-144.
Liu Tao, Liu Xin, Liang Shibin, Wang Junkai, Yao Chenguo. Residual Flux Measuring Method on the Core of Ferromagnetic Components Based on Alternating Polarity DC Voltage Source. Transactions of China Electrotechnical Society, 2017, 32(13): 137-144.
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