Investigations on Sheath Voltage and Current During Short-Circuited Condition On a Cross-Bonded Cable

Abstract

The Sheath is an eternal part of a cable, protects the insulation from moisture ingression, acts as an electrical shielding, and also a return path for load and fault current. Being grounded to at least any single point the cable sheath will always have either one of them or both types of phenomenon, the sheath voltage, and sheath current. To minimizes the losses in the sheath, the cable sheath was bonded in a cross-bonded formation., with the presence of a sheath voltage limiter (SVL). The SVL protects the cable sheath from transients and faults. In the lifespan of the cable, the most unavoidable event is the occurrence of faults. In the presence of a short-circuited fault at a particular phase, the sheath of the other phase may also get affected, causing deterioration in the condition of the cable. In this paper, a comparative study of sheath voltage and sheath current during a short-circuited fault at each phase was studied for both cases, in the presence and absence of SVL, the simulation study was carried out with circuit simulating software.