电工技术学报  2015, Vol. 30 Issue (16): 10-16    DOI:
电机电器 |
电力变压器铁心剩磁的测量与削弱方法
戈文祺1,汪友华2,陈学广2,肖树欣2,杨晓光2,吕殿利2
1. 河北工业大学机械工程学院 天津 300130;
2. 河北省电磁场与电器可靠性省部共建重点实验室 天津 300130
Method to Measure and Weaken the Residual Flux of the Power Transformer Core
Ge Wenqi,Wang Youhua,Chen Xueguang,Xiao Shuxin,Yang Xiaoguang,lü Dianli
1. School of Mechanical Engineering Hebei University of Technology Tianjin 300130 China;
2. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Tianjin 300130 China
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摘要 大型电力变压器在各种检测以及运行之后,由于其铁心结构的封闭性以及铁磁材料固有的磁滞现象,会在铁心中留有剩磁。剩磁的存在将加速电力变压器铁心的磁化饱和,产生励磁涌流。本文提出一种新的剩磁测量方法,通过分析剩磁产生的原理,对已知电力变压器进行电磁暂态仿真分析建立剩磁-电流的关系式。选取环形变压器铁心搭建实验检测电路,处理实验得到暂态测量电流信号,并将结果代入已建立的剩磁-电流关系式中,得到电力变压器铁心中的剩磁。在已知剩磁的基础上研究已有的去磁方法,选取直流法削弱剩磁,根据测量得到的剩磁进行去磁电流设定。通过消磁前后的测量电流波形对比说明能够有效地削弱剩磁,达到减小涌流的目的,验证了去磁方法的有效性。
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关键词 剩磁测量电流环形电力变压器铁心直流去磁    
Abstract:When the power transformer is de-energized, there will be a certain amount of residual magnetic flux due to the inherent hysteresis in the ferromagnetic material and the closed structure of the transformer core. The residual flux may increase saturation of the iron core and lead to high transient magnetizing inrush current. This paper presents a novel method to measure the residual flux. Starting from analyzing the principle of residual magnetic flux, the transient electromagnetic simulation for the power transformer is analyzed and a formula of the residual magnetic flux and the current is established based on the results. A toroidal transformer iron core has been selected. Through analyzing the transient measurement current signals observed from the oscilloscope, the analyzed signals were substituted into the relational formula obtained by simulation. The DC (direct current) current method were identified, through a literature review to weaken the residual flux and set the demagnetization current according to the obtained residual flux. The comparison of the measurement current waveforms before and after demagnetization shows that this method can effectively weaken the residual flux and achieve the goal of weakening the inrush current, which finally proves the effectiveness of the demagnetizing method.
Key wordsResidual magnetic flux    measurement current    iron core of toroidal power transformer    DC demagnetization   
收稿日期: 2013-11-21      出版日期: 2015-09-14
PACS: TM406  
基金资助:国家自然科学基金资助项目(51377042)
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、电磁冶金与全局优化设计。   
作者简介: 戈文祺 女,1986年生,博士后,研究方向为工程电磁场与磁技术。
引用本文:   
戈文祺,汪友华,陈学广,肖树欣,杨晓光,吕殿利. 电力变压器铁心剩磁的测量与削弱方法[J]. 电工技术学报, 2015, 30(16): 10-16. Ge Wenqi,Wang Youhua,Chen Xueguang,Xiao Shuxin,Yang Xiaoguang,lü Dianli. Method to Measure and Weaken the Residual Flux of the Power Transformer Core. Transactions of China Electrotechnical Society, 2015, 30(16): 10-16.
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https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I16/10