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《AUTOMATION OF ELECTRIC POWER SYSTEMS》 1999-13
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STUDY ON THE APPLICATION OF WAVELET TRANSFORM TO DETECT EARTH-FAULT IN DISTRIBUTION AUTOMATION SYSTEM

Cao Fengmei,Su Peipu(North China Electric Power University,100085,Beijing,China)  
How to detect earth-fault quickly and accurately is an important subject in distribution automation system.Because the neutral point in distribution automation system is not grounded directly,the transient status of fault-voltage and current last only for a short time but comprise abundant characteristic values when earth-fault happens.On the other hand,the static value is very small,so choosing a new theory to analyze the transient value will enhance the ability of earth-fault relaying.Wavelet analysis over comes the shortcoming of Fourier transform in the term of time-frequency analysis.It has strong ability to abstract the character of signal,especially in analyzing the transient signal or faint signal.The paper uses the declining and oscillating wavelet function into the earth-fault detection of distribution automation system.The analysis of the data from EMTP proves that the proposed method can enhance the ability of relaying greatly.
【CateGory Index】: TM773
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