Ground-fault Location Algorithm for Ungrounded Radial Distribution Systems |
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Authors: | Soon-Ryul Nam Sang-Hee Kang Jin-Man Sohn Jong-Keun Park |
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Affiliation: | (1) Next-Generation Power Technology Center and Department of Electrical Engineering, Myongji University, Yongin, 449-728, South Korea;(2) School of Electrical Engineering, Seoul National University, Seoul, 151-742, South Korea |
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Abstract: | This paper proposes a single phase-to-ground fault location algorithm for ungrounded radial distribution systems. The algorithm
uses the voltage equation from the relay location to the fault location, which contains three unknown variables: zero-sequence
fault current, fault resistance, and fault distance. The zero-sequence fault current can be determined using the zero-sequence
relay current. Inserting the zero-sequence fault current into the voltage equation results in an equation that contains only
the fault resistance and fault distance. The fault resistance is removed by extracting the components orthogonal to the zero-sequence
fault current from the equation and finally the fault distance is estimated. Simulation results indicate that the algorithm
performs well regardless of fault resistance and fault distance. |
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Keywords: | Single phase-to-ground fault Fault distance Fault resistance Ungrounded radial distribution system Voltage equation |
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