电工技术学报  2022, Vol. 37 Issue (5): 1088-1097    DOI: 10.19595/j.cnki.1000-6753.tces.210115
电工理论 |
基于暂态电流差极值的电力变压器剩磁测量方法
任于展1,2, 武仕朴1,2, 汪友华1,2, 刘成成1,2, 火彩玲1,2
1.省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学) 天津 300130;
2.河北省电磁场与电器可靠性重点实验室(河北工业大学) 天津 300130
Residual Flux Measurement Method of Power Transformer Based on Extreme Value of Transient Current Difference
Ren Yuzhan1,2, Wu Shipu1,2, Wang Youhua1,2, Liu Chengcheng1,2, Huo Cailing1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China
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摘要 电力变压器在空载合闸过程中产生的励磁涌流会对电网及设备产生诸多不利影响。为有效削弱铁心中的剩磁以降低励磁涌流出现的概率,准确测量铁心内剩磁的大小及方向十分必要。基于磁性材料的电磁暂态特性,该文提出一种外施直流电压的剩磁测量方法,剩磁导致绕组中施加正、反向电压下的暂态电流波形不同,结合场路分析,建立了剩磁与暂态电流差极值之间的关系。为提高剩磁测量的准确性,对待测方形铁心进行建模和分析,优选了一组合适的测试电路参数,并依据有限元计算结果拟合得到铁心中剩磁与暂态电流差极值关系的经验公式,为变压器铁心剩磁的定量检测奠定基础。最后搭建测量平台,对待测铁心进行实验研究,测量结果验证了所提方法的可行性和准确性。
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任于展
武仕朴
汪友华
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火彩玲
关键词 电力变压器励磁涌流剩磁场路分析暂态电流差    
Abstract:When a transformer is energized under no-load conditions, the magnetizing inrush current will have adverse effects on the power grid and equipment. In order to effectively weaken the residual flux density in the iron core to reduce the occurrence probability of magnetizing inrush current, it is necessary to measure the magnitude and direction of the residual flux density. Based on the electromagnetic transient characteristics of magnetic materials, a method for measuring the residual flux density of applied DC voltage was proposed in this paper. The residual flux density led to different transient current waveforms in the winding under positive and negative voltage. Combined with the field-circuit coupling analysis method, the relationship between the residual flux density and the extreme value of the transient current difference was established. In order to improve the accuracy of the measurement, the square core to be tested was modeled and analyzed, and suitable test circuit parameters were selected. According to the results of finite element calculation, the empirical formula between the residual flux density and the extreme value of the transient current difference was obtained, which laid a foundation for quantitative test of the residual flux density. Finally, a measurement platform was built, and the iron core to be tested was studied by experiments. The measurement results verify the feasibility and accuracy of the proposed method.
Key wordsPower transformer    magnetizing inrush current    residual flux    field-circuit coupling analysis    transient current difference   
收稿日期: 2021-01-21     
PACS: TM406  
基金资助:国家自然科学基金资助项目(51877065)
通讯作者: 汪友华 男,1964年生,教授,博士生导师,研究方向为工程电磁场与磁技术、磁材料特性的建模与测量、电磁冶金与全局优化设计。E-mail:wangyi@hebut.edu.cn   
作者简介: 任于展 男,1997年生,硕士研究生,研究方向为工程电磁场与磁技术。E-mail:1094500481@qq.com
引用本文:   
任于展, 武仕朴, 汪友华, 刘成成, 火彩玲. 基于暂态电流差极值的电力变压器剩磁测量方法[J]. 电工技术学报, 2022, 37(5): 1088-1097. Ren Yuzhan, Wu Shipu, Wang Youhua, Liu Chengcheng, Huo Cailing. Residual Flux Measurement Method of Power Transformer Based on Extreme Value of Transient Current Difference. Transactions of China Electrotechnical Society, 2022, 37(5): 1088-1097.
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