Software Methods for Analysis of Transient Voltages Coupled to Shielded Cables in Hv Substations

Two main causes of such induced voltages in the shield are: time-varying magnetic flux and potential difference at the cable connections with the earthing system. It has been shown in that both components of the voltage along shield, due to ground potential difference and field coupling, are significant and moreover that they cancel each other. As a consequence, it is possible to optimize the design of the protection of cables connecting electronic equipment in power and industrial plants by considering modification of earthing system and defining requirements for the cable shielding.