摘要：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 opera- tion 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 oper- ating 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.
