Insulation Monitoring and Diagnosis of Faults in Cross-Bonded Cables Based on the Resistive Current and Sheath Current

To reduce the induction voltage in metal sheath, cross-bonded grounding is a widely adopted method long-distance high power cables, but this introduces challenges to online monitoring and diagnosis of cable insulation. An for insulation based on analysis resistive current proposed paper. A theoretical formula separation between leakage sheath was derived, obtained. equivalent circuit three-phase long distance established using MATLAB/Simulink platform. The simulation used model three typical faults: deterioration, open faults, breakdown intermediate joint faults. results show that can be monitor each cable’s state under cross-bonded, it also determine faults fault location measured values by corresponding sensors increases significantly. Based analyses, diagnostic criteria are different types locations.