Calculation of induced sheath voltage for transposed and untransposed cable conductors

Abstract

In this paper, we studied the power cables used in Berakas Power Management Company Brunei Darussalam (BPMC), with the aim of finding the optimal values of radius of the cables and their phase distance. The electromagnetic coupling effect creates many problems hindering safe operation of cables and produces induced voltages in metallic sheath or shield of cables. Therefore, the main objective of this paper is to contribute ways for reducing coupling effect by finding the optimal values of phase distance and radius and also by discovering proper arrangement of the cables. This paper presented a study of the electromagnetic coupling effect in underground power cables by examining induced voltages with the variation in phase distance in metal shield of cables. The study is carried out for both the flat and trefoil formations. Both the transposed and un-transposed conductors are also considered for comparison. It is found that the flat formation with transposition has less induced sheath voltage and there is no effect of transposition on trefoil formation. In addition, we calculated the optimal values of phase distance between cable conductors and the proper arrangement for the cables to minimize the induced voltage in metallic shield for the cables used in BPMC.