基于暂态电流的三相变压器剩磁测量系统  

Design of Residual Flux Measurement System for Three-phase Transformer Based on Transient Current

作　　者：田思雨 汪友华[1,2] 刘成成[1,2] 武仕朴 任于展 TIAN Siyu;WANG Youhua;LIU Chengcheng;WU Shipu;REN Yuzhan(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Tianjin 300130,China;Hebei Key Laboratory of Electromagnetic Field and Electrical Reliability(Hebei University of Technology),Tianjin 300130,China)

机构地区：[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

出　　处：《仪表技术与传感器》2023年第12期44-50,57,共8页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(51877065)。

摘　　要：针对传统剩磁测量系统存在的采样精度低、装置体积大和容易受外界因素影响等问题,设计了一种以数字信号处理器(DSP)为核心处理器的基于暂态电流的剩磁测量系统。系统利用暂态电流和剩磁之间的关系,利用高速A/D转换器以及数字信号处理技术,实现了快速、准确地测量流过变压器铁芯的暂态电流。通过非线性处理的方法拟合暂态电流和时间的关系,进而根据时间常数计算剩磁。实验结果表明:与传统剩磁测量装置相比,该系统的数据传输迅速且稳定,可靠性高,适用于需要在线测量的场合。Aiming at the problems of low sampling accuracy,large device size,and easy influence of external factors in tradi-tional residual flux measurement systems,a residual flux measurement system based on transient current with the digital signal processor(DSP)as the core processor was designed.The system used the relationship between transient current and residual flux,and realized fast and accurate measurement of the transient current flowing through the transformer core by using high-speed A/D converters and digital signal processing technology.The relationship between transient current and time was fitted by nonlin-ear processing,and residual flux was calculated based on time constants.Compared with the traditional residual flux measuring device,the data transmission of this system is fast,stable,and reliable.It is suitable for online measurement.

关 键 词：三相变压器 暂态电流 数字信号处理器 剩磁 非线性处理 测量系统 

分 类 号：TM932[电气工程—电力电子与电力传动]