Cable Condition Diagnosis of Induced voltage and Sheath Current Monitoring

Abstract

An integrated system for monitoring the condition of high voltage (HV) power cables and localizing faults is proposed. The methodology focuses on identifying faults in the cable sheath by analyzing sheath system currents in underground cable systems. The approach begins with the development of a numerical model to simulate sheath currents. Following this, the paper presents an analysis of various common and consequential faults based on current measurements at the link cable. Simulations of both normal and fault conditions are provided to assess the feasibility of fault detection. To model a faulted underground cable system, an equivalent circuit is analyzed using a lumped parameter approach. This model allows for the examination of radial configurations of metallic cable sheath grounding and their effect on the induced voltages within the sheath. By modeling and analyzing the monitored sheath currents and induced outer sheath voltage, the fault finding can be determined. Finally, case studies are presented, evaluating the system's performance with varying fault distances and resistances. These evaluations highlight the system's effectiveness in fault localization and condition monitoring