浙江电力2026，Vol.45Issue(4)：104-112,9.DOI:10.19585/j.zjdl.202604010
基于特定频率方波激励的保护用电流互感器剩磁检测研究
Study on residual-magnetism detection of protection current transformers based on square-wave excitation at a predefined frequency
摘要
Abstract
Accurate detection of residual magnetism in protection current transformer(CT)cores is essential for ef-fective 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 cir-cuit,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
电流互感器/残留剩磁/剩磁检测/方波激励Key words
CT/residual magnetism/residual-magnetism detection/square-wave excitation引用本文复制引用
张欣,龚成尧,陈云龙,胡茵,黄陈铖,郑太英..基于特定频率方波激励的保护用电流互感器剩磁检测研究[J].浙江电力,2026,45(4):104-112,9.基金项目
国家自然科学基金(51707173) （51707173）
