电工技术学报2017，Vol.32Issue(13)：137-144,8.DOI:10.19595/j.cnki.1000-6753.tces.151972
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
Residual Flux Measuring Method on the Core ofFerromagnetic Components Based on Alternating Polarity DCVoltage Source
摘要
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.关键词
剩磁通/剩磁系数/励磁涌流/剩磁测量/磁滞回线Key words
Residual flux/remanence coefficient/inrush current/measuring of residual flux/hysteresis loop分类
信息技术与安全科学引用本文复制引用
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):137-144,8.基金项目
中国南方电网有限责任公司科技项目资助(K-YN2014-136). （K-YN2014-136）
