Cross-Bonding of MV Cable Lines for Energy Losses Decrease

Abstract

Currently, almost all medium voltage cable lines (MV) operate with the return wires earthed at both ends of the cable. Such a way of operation causes that during normal states of operation as well as during disturbances, e.g. short-circuits, in the return wires induce currents whose values mainly depend on the currents flowing in the phase wires. These currents in normal operating states are a source of additional energy losses incurred in the MV cables. The effect can be decreased by the return wires cross-bonding or the phase wires transposition. The paper discusses the potential effects that can be achieved by use of the return wires cross-bonding or the phase wires transposition in the domestic grids.