Waluyo, Waluyo and Saodah, Siti and SARANGA, Febriany Kalatiku (2020) Overvoltages due to Single-Phase-to-Ground and Double-Phase Faults on a 20 kV Feeder. Electrotehnică, Electronică, Automatică (EEA), 68 (1). 05-11. ISSN 1582-5175

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Abstract

One fault classification is an asymmetric fault, which causes a voltage and current on each phase to be unbalanced. This study analysed the voltage variations, including overvoltages, due to single-phase-to-ground and double-phase faults on a 20 kV three-phase distribution feeder. Both computations and simulations were carried out at 25%, 50%, 75%, and 100% of the feeder length, and further compared for analysis. From the comparison results, it was obtained that, as the point of fault far away, the source on the feeder, the fault currents would reduce, both for singlephase- to-ground and double-phase faults, both for simulation and computation. While, the healthy phase voltage, on the single-phase-to-ground fault, rose 1.61 up to 1.74 for the simulations and 3.46 up to 5.28 for the computations compared to the normal voltage. Finally, the faulty phase voltages, on the double phase-fault, reduced to 0.5 for the simulation and 0.45 up to 0.81 for the computation to the normal voltage. Keywords: distribution feeder, double-phase fault, overvoltage, single-phase-to-ground fault, unbalanced

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