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| Study of Fluxgate Current Detecting Method for AC-DC Earth Leakage Current Based on apFFT |
| Wang Yao1, 3, Li Kui1, Ren Bofei1, Zou Xu1, Ge Leijiao2, Ye Haiwu3 |
1. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China;
2. Tianjin University Tianjin 300072 China;
3. People ELE. Appliance Group China Wenzhou 325604 China |
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Abstract 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.
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Received: 21 November 2013
Published: 20 October 2015
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2015, Vol. 30 
