基于全相位傅里叶变换的磁调制交直流漏电电流检测方法

发布时间：2018-04-18 01:08

本文选题：全相位傅里叶变换 + 磁调制　；参考：《电工技术学报》2015年18期

【摘要】：电力电子设备发生漏电故障时,其漏电电流为交直流复合的复杂电流信号,传统的电磁式电流检测方法、霍尔电流检测方法或双铁心磁调制电流方法均无法满足复杂漏电电流的检测要求。针对这一问题,提出一种基于全相位傅里叶变换的磁调制交直流漏电电流检测方法,采用电压型单铁心磁调制互感器进行交直流漏电电流检测,可以简化互感器结构;同时采用全相位傅里叶变换进行磁调制电流解调,可以简化解调电路结构。试验结果表明,全相位傅里叶变换有效克服了非周期采样造成的频谱泄漏问题,从而使互感器具有较高的检测准确度。
[Abstract]:When leakage fault occurs in power electronic equipment, the leakage current is a complex AC / DC current signal, and the traditional electromagnetic current detection method,Hall current detection method or double core magnetic modulation current method can not meet the detection requirements of complex leakage current.To solve this problem, a magnetic modulation AC / DC leakage current detection method based on all phase Fourier transform is proposed. The structure of transformer can be simplified by using voltage type single core magnetic modulation transformer to detect AC / DC leakage current.At the same time, the magnetic modulation current demodulation using all phase Fourier transform can simplify the demodulation circuit structure.The experimental results show that the all-phase Fourier transform can effectively overcome the spectrum leakage caused by aperiodic sampling and thus make the transformer have higher detection accuracy.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;人民电器集团公司;天津大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(51077038)
【分类号】：TM934.31

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