Single phase to ground fault locator for distribution systems with distributed generation

This paper presents the definition and the extended application of a fault location technique for power distribution systems based on the well defined equivalent sequence networks. The proposed location technique uses the voltages and currents measured at the main power substation and also at the DG source. The analysis is presented for a single phase to ground faults. The proposed fault localization technique is tested on the 24.9kV IEEE 34 nodes test feeder, which includes three-phase and single phase laterals and a main three phase distribution feeder, considering several fault resistance values in a rage of 0Ω to 40O. According to the results, the estimation errors obtained in fault distance are lower than ±1.5%.