Influence of Transmission Line Wire Transposition on Asymmetry Levels and Power Transfer Capability

In modern electrical systems of three-phase current, combining a large number of diverse elements, there is always a certain asymmetry of currents and voltages. One of the sources of such a constant unbalance is that part of it, which is due to the topology of the phase arrangement of extra high voltage lines. With any geometric arrangement of the phase wires (if you do not use their transposition), it is practically impossible to ensure the symmetry of all its electrical parameters, and, consequently, the symmetry of currents and voltages. Significant unbalance of currents and voltages in the system can cause additional losses and heating in generators and receivers of electrical energy, improper operation of relay protection. To reduce the unbalance of currents and voltages generated by high voltage lines, various methods can be used, for example, line phase transposition.