张欣,龚成尧,陈云龙,胡茵,黄陈铖,郑太英
ZHANG Xin,GONG Chengyao,CHEN Yunlong,HU Yin,HUANG Chencheng,ZHENG Taiying

• 1:杭州电力设备制造有限公司
• 2:杭州市新能源汽车服务有限公司
• 3:浙江大学电气工程学院

摘要(Abstract)：

精准检测保护用电流互感器铁心剩磁，对实现铁心消磁，并防止因电流互感器饱和引发的保护误动具有重要意义。为此，提出一种基于特定频率方波激励的剩磁检测方法。该方法通过单相逆变器在电流互感器二次侧施加特定频率与幅值的方波电压，使铁心双向深度饱和，在激磁电流中提取检磁信号并计算出铁心剩磁。利用EMTP-RV平台在不同频率、幅值及幅频组合的方波电压激励下进行铁心剩磁检测和误差分析。仿真实验结果表明，所提方法能够快速准确地检测出铁心剩磁，增大检磁电压幅值和降低频率可进一步减小误差，检测完成后铁心剩磁回归到检测之前的状态，为后续基于已知剩磁的快速消磁研究提供了保障。
Accurate detection of residual magnetism in protection current transformer(CT) cores is essential for effective demagnetization and for preventing protection misoperations caused by CT saturation. To address this issue, a residual-magnetism detection method based on square-wave excitation at a specific frequency is proposed. A single-phase inverter applies a square-wave voltage at a predefined frequency and amplitude to the CT secondary circuit, driving the core into bidirectional deep saturation. The magnetizing current is analyzed to extract the detection signal and calculate the residual magnetism. CT core residual-magnetism detection and error analysis are conducted on the EMTP-RV platform under square-wave excitation with different frequencies, amplitudes, and combined amplitude-frequency settings. Simulation results demonstrate that the proposed method can rapidly and accurately detect residual magnetism. Increasing the excitation voltage amplitude and reducing the frequency further reduce the error. After testing, the core residual magnetism returns to its initial state, providing a foundation for subsequent rapid demagnetization studies based on known residual magnetism.

关键词(KeyWords)： 电流互感器;残留剩磁;剩磁检测;方波激励
CT;residual magnetism;residual-magnetism detection;square-wave excitation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（51707173）

作者(Author): 张欣,龚成尧,陈云龙,胡茵,黄陈铖,郑太英
ZHANG Xin,GONG Chengyao,CHEN Yunlong,HU Yin,HUANG Chencheng,ZHENG Taiying

DOI: 10.19585/j.zjdl.202604010

参考文献(References)：

• [1]HAJIPOUR E,SALEHIZADEH M,VAKILIAN M,et al.Residual flux mitigation of protective current transformers used in an autoreclosing scheme[J]. IEEE Transactions on Power Delivery,2016,31(4):1636-1644.
• [2]ZHENG T,WANG Y.Fast and in situ remanent flux detection method for a protection current transformer based on the fluxgate theory[J]. AIP Advances,2021,11:015034.
• [3]王鹏玮，徐丙垠，陈恒，等.零序电流互感器误差对小电流高阻接地保护影响及选型[J].电力系统自动化，2023,47(12):154-162.WANG Pengwei,XU Bingyin,CHEN Heng,et al.Influence of error of zero-sequence current transformer on small-current high-resistance grounding protection and type selection[J].Automation of Electric Power Systems,2023,47(12):154-162.
• [4]王风光，杜兴伟，李力，等.母线差动保护电流互感器断线处理逻辑[J].电力系统自动化，2023,47(14):167-173.WANG Fengguang,DU Xingwei,LI Li,et al.Processing logic against current transformer disconnection of busbar differential protection[J]. Automation of Electric Power Systems,2023,47(14):167-173.
• [5]王雨霏.计及剩磁的保护用电流互感器饱和特性研究及基于磁通门理论的快速在线剩磁检测策略[D].杭州：浙江大学，2021.Research on saturation characteristics of protection current transformers with remanent flux and fast, in situ remanent flux detection method based on Fluxgate Theory[D].Hangzhou:Zhejiang University,2021.
• [6]RAJI??T,STOJANOVI??Z.An algorithm for longitudinal differential protection of transmission lines[J].International Journal of Electrical Power&Energy Systems,2018,94:276-286.
• [7]BAYNES T M,RUSSELL G J,BAILEY A.Comparison of stepwise demagnetization techniques[J].IEEE Transactions on Magnetics,2002,38(4):1753-1758.
• [8]杨志强，陈卫.电流互感器铁心剩磁测量方法研究[J].电力工程技术，2018,37(3):38-42.YANG Zhiqiang,CHEN Wei.Research on the method of measuring residual flux in the core of current transformer[J].Electric Power Engineering Technology,2018,37(3):38-42.
• [9]陈文臣，雷晓燕，王磊.电力变压器铁心剩磁检测方法研究[J].四川电力技术，2009,32(6):45-48.CHEN Wenchen,LEI Xiaoyan,WANG Lei.Study on residual magnetism detection method of power transformer core[J]. Sichuan Electric Power Technology,2009,32(6):45-48.
• [10]彭涛.变压器剩磁变化规律及励磁涌流抑制研究[D].武汉：华中科技大学，2017.PENG Tao. Research on remanence variation and inrush current suppression of transformer[D].Wuhan:Huazhong University of Science and Technology,2017.
• [11]GE W Q,WANG Y H,ZHAO Z H,et al.Residual flux in the closed magnetic core of a power transformer[J].IEEE Transactions on Applied Superconductivity,2014,24(3):0502404.
• [12]WANG Y H,REN Y Z,LIU C C.Residual flux density measurement method of the single-phase transformer based on phase difference[C]//2022 IEEE 20th Biennial Conference on Electromagnetic Field Computation(CEFC).October 24-26,2022.Denver,CO,USA.IEEE,2022:1-2.
• [13]HUO C L,WANG Y H,WU S P,et al.Residual flux density measurement method for transformer core considering relative differential permeability[J].IEEE Transactions on Magnetics,2021,57(2):8400204.
• [14]HUO C L,WANG Y H,WU S P,et al.Research on residual flux density measurement for single-phase transformer core based on energy changes[J].IEEE Transactions on Instrumentation and Measurement,2021,70:6011909.
• [15]赵紫薇，汪友华，火彩玲.变压器环形铁芯建模和剩磁测量[J].电测与仪表，2023,60(7):116-121.ZHAO Ziwei,WANG Youhua,HUO Cailing. Toroidal iron core modeling of transformer and residual flux density measurement[J].Electrical Measurement&Instrumentation,2023,60(7):116-121.
• [16]金雷，谢齐家，罗维，等.基于绕组变形测量的电力变压器剩磁大小估算[J].变压器，2019,56(10):61-64.JIN Lei,XIE Qijia,LUO Wei,et al. Estimate of remanence of power transfomer based on measurement of winding deformation[J].Transformer,2019,56(10):61-64.
• [17]CAVALLERA D,OIRING V,COULOMB J L,et al.A new method to evaluate residual flux thanks to leakage flux,application to a transformer[J]. IEEE Transactions on Magnetics,2014,50(2):7024904.
• [18]李钷，乌云高娃，刘涤尘，等.Preisach模型剩磁计算与抑制励磁涌流合闸角控制规律[J].电力系统自动化，2006,30(19):37-41.LI Po,WU Yungaowa,LIU Dichen,et al.Calculation of residual flux based on preisach model and entering phase control of transformer to eliminate inrush current[J].Automation of Electric Power Systems,2006,30(19):37-41.
• [19]陶风波，张刚，李建生，等.基于局部磁滞回线斜率的变压器铁心剩磁估算[J].变压器，2019,56(2):27-33.TAO Fengbo,ZHANG Gang,LI Jiansheng,et al.Remanent magnetism estimation of transformer CoreBased on local hysteresis loop slope[J].Transformer,2019,56(2):27-33.