Integrated Modeling of the Modes of High Voltage Long Distance Electricity Transmission Lines

This paper develops computer models of ultra-high voltage long-distance electricity transmission lines (LDETL). The models provide an integrated simulation of modes and determine the conditions of electromagnetic safety. We used methods based on phase coordinates and lattice equivalent circuits with a fully connected topology. The simulation was carried out for a 1150 kV LDETL 900 km long, each phase of which was formed by eight 330 mm(2) steel reinforced aluminium wires. We used the Fazonord software package. Along with the calculations of the modes of the electric network incorporating the 1150 kV LDETL, we performed determination of the electromagnetic fields created by this line. The results obtained showed a significant asymmetry of the phase currents at full cycles of wire transposition. To maintain a symmetrical mode for such load, phase-wise regulation of reactive power sources is required.