Author(s)

I. Medic, M. Majstrovic & P. Sarajcev

Abstract

Calculation of earthing and screening effects of compensation conductor laid alongside underground multi-cable power lines I. Medic1, M. Majstrovic2 & P. sarajcevl I Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Croatia. 2 Energy Institute "Hwoje Poiar ", Zagreb, Croatia. Abstract Power substations in an urban area are interconnected by high voltage underground power cables, resulting also in interconnections of their earthmg grids through cable metallic screenslsheaths. Most modem power cables with XLPE insulated core have metallic screens which are practically insulated from ground. These screens can only be (and usually are) grounded at cable ends and therefore do not act like extra earth electrodes extending from a station. In thls case, almost the same positive earthing effects of an extended electrode can be obtained only by extending an auxiliary wire in the same trench and routing it closely parallel to the power line. This bare

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