Accurate Single-Fnded Fault Location for Cable-OHL Hybrid Transmission Lines

This paper proposes two single-ended fault location methods for cable - overhead line (OHL) hybrid transmission lines. Three phase voltage and current phasors at only the local terminal arc required. First, the well-known Eriksson fault location method is modified as the proposed method 1, to improve the fault location performance in this situation, where the lumped parameter line model is adopted. Afterward, the fully distributed parameter line model is considered in the proposed method 2, to further enhance the accuracy of line model; the fault location can be solved via the Newton's iterative methods. In numerical experiments, the two proposed methods present higher accuracy of fault location than the traditional Eriksson method, with various fault types, fault locations and fault resistances. The proposed method 2 demonstrates the highest fault location accuracy among all three methods.