Fault prelocalization of underground single-phase cables: Modeling and simulation
This paper proposes a tool of assistance to prelocate insulation faults affecting electrical single-phase cables by using measurements of voltage and current available in source substation. An equivalent network modeling faults to the ground is analyzed by employing the distributed parameters approach. The per-unit length values of these parameters are calculated according to the geometrical data of the cable. The specificity of this tool is the introduction of a resistance to model sheath-ground insulation what allows studying various types of short-circuits to the ground (frank and resistive). Scenarios of fault are applied to the underground cable 150kV, connecting high voltage (HTB) sub-stations of TynaTaparouraSidimansour in Sfax city of Tunisia. A study of validation is approved by the software SimulinkSimPowerSystems of Matlab.
prelocalization modeling insulation fault distributed parameters underground cable fault distance