Origin of the circulating currents on the quadrupple EHV/VHV transmission line during the specific operation

Abstract

This paper is focused on an analysis of mutual influence between the circuits of different voltage level located on the same pylon. The significant consequence of these mutual couplings between all conductors including earth wires is a voltage induced into conductors which results in current asymmetry not only during a specific operations but also during standard operations. In the case, that some circuits are switched-off, the switched-on circuits induce voltage via inductive couplings to the switched-off circuits, which brings some problems for instance the circulating currents in the unloaded line. This phenomenon has been analysed on the quadruple EHV/VHV non-transposed transmission line and the capacitive couplings were neglected.