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Recursive Real Time Fault Locator with Wavelet Method  

Lee, Sung-Woo (한전 전력연구원 책임연구원)
Ha, Bok-Nam (한전 전력연구원 수석연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.57, no.9, 2008 , pp. 1522-1530 More about this Journal
Abstract
This paper presents a discrete wavelet analysis based algorithm to address the fault impedance calculation under transient state in radial power distribution networks. The fault impedances have been derived under different fault conditions. Furthermore, a recursive fault distance estimation method is proposed utilizing the measured fault impedance and power line parameters. The proposed scheme can resolve the errors caused by the non-homogeneous power lines, the presence of lateral loads since, the fault impedance will always be updated with the recursive form. For the verification of the proposed scheme, a filed test has been peformed with varying fault resistances in the 22.9(kV) radial system. Power meters and fault locators were installed at the substation. It was figured out that the performance of the discrete wavelet and the recursive scheme are very good even for high fault resistance condition.
Keywords
Wavelet Method; Single Ended Method; Double Ended Method; Transient state; Recloser; Fault impedance;
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