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A New Method for Fault Line Selection in the Resonant Grounding System Based on Approximate Entropy

A New Method for Fault Line Selection in the Resonant Ground...

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2012 International Conference on Computer Science and Artificial Intelligence(CSAI 2012)

作者： Wang Jian-yuan Liu Jia-ning Meng Qing-kai Zhang Yu Li Chun-zi School of Electrical Engineering Northeast Dianli University

A new method based on approximate entropy is proposed to use in selecting fault line of resonant grounding system by effectively analyzing the transient zero sequence current which includes rich fault information. In this method, feature band need to be determined first because that the single belong to the feature band could reflect the fault information. And then EMD is used to analyze the transient zero sequence current to get its IMF (Intrinsic Mode Function) component. By comparing feature band with the leading instantaneous frequency, the appropriate IMF component would be identified. The calculation of approximate entropy of every appropriate IMF component help to judge which line is fault line. Large amount of simulation results verify the accuracy and effectiveness of the algorithm about distinguishing all kinds of single-phase-to-ground faults.

关键词： Fault Line Selection Approximate Entropy EMD feature band Resonant Grounding System

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On Small Current Grounding System in Single-phase Grounding Fault Line Selection Based on DSP

On Small Current Grounding System in Single-phase Grounding ...

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第二十九届中国控制会议

作者： LI Bo1,CHU Lili1,LIU Yanjun2 1 Information Science&Engineering College,Liaoning University of Technology,Jinzhou 121001,P.R.China2 School of Sciences,Liaoning University of Technology,Jinzhou 121001,P.R.China

The fault mechanism of small current grounding system in single-phase grounding is discussed,and the principle of fault line selection of transient component on faulty phase current is *** the design of hardware and software,it is proved the amplitudes summation of zero sequence transition current between fault line and healthy lines makes a big difference in the feature *** analysis of the system simulation shows the area of zero sequence transition current on fault line in the spectrum is the ***,the application of small current grounding system in single-phase grounding fault line selection based on DSP is an advanced novel method which can distinguish between fault line and healthy lines effectively and accurately.

关键词： Line Selection Transient Current Spectrum DSP feature band

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