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。
The earth leakage current of power electronic equipment is a complicated signal when an earth fault occurs. The conventional current detecting methods based on electro-magnetic induction, hall-effect or fluxgate with double cores fail to meet the demand for such complicated signals. This paper proposes a fluxgate current detecting method for AC-DC earth leakage current based on apFFT. A voltage-based fluxgate current sensor with single core is used to detect AC-DC earth leakage current, so that the structure of the current sensor can be simplified. Meanwhile, apFFT is used to process the signals to simplify the structure of the demodulation circuit. Test results show that spectrum leakage is suppressed effectively due to apFFT and good detecting accuracy is obtained.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第18期254-260,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51077038)
