A new method for calculation of power losses in ground wires of HV and EHV transmission lines

A new matrix method for calculation of voltages and currents in phase conductors and ground wires of HV and EHV transmission lines with rated voltage 110 kV and above is presented in this paper. The proposed method is general and can handle single and double circuit transmission lines equipped with one or two ground wires. The method takes into consideration in calculations voltages and currents induced in the ground wires because of the unbalanced loads in the system, as well as currents induced in the ground wires due to the fact that the line is not transposed. Admittance summation method from [1] and [2], appropriate modified for matrix analysis of multi-phase power lines, is used for solving the mentioned problem. Numerous calculations of voltages, currents and power losses due to the currents induced in the ground wires in many HV and EHV transmission lines are made by means of the proposed method. Some results are also presented in the paper and interesting conclusions as a result of this investigation are done (author)