Abstract
The metallic sheath in cables is supposed to carry a substantial current mainly during ground faults and also acts as a return path for capacitive charging current. However, electromagnetic coupling between the conductor and the metallic sheath may lead to induction of emf. The induced emf is responsible for an additional current in the sheath, which may pose certain problems. The existing methods of sheath current calculations tend to involve mathematical complexities and thus a simplified circuit model is desirable. This paper focuses on finding resemblance of metallic sheathed cable with transformer and proposes an equivalent circuit model. Experimental methods are presented to estimate the series parameters of the equivalent model and also to estimate the effective transformation ratio. The results are validated through comparison with simulation and approximate analytical results and were found to be in agreement.
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