Phasor Domain Transmission Line Fault Locating with Three Phase Distributed Parameter Modeling

Accurate fault locating reduces power outage time and operational costs. In this paper, a novel phasor domain transmission line fault locating algorithm is proposed. Best implementation requires GPS synchronized measurements at both terminals of the line. First, the model of the transmission line with fault is constructed using three phase distributed parameter modeling with neutral conductors and grounding representation. The model is without the assumption that the transmission line is geometrically balanced. Next, the state estimation algorithm is utilized to solve the model of the transmission line with fault, where the fault location is included as a state. Numerical experiments demonstrate that the method has higher accuracy than traditional fault locating methods, independent of fault types, locations and impedances.