Uprating a 220 kV double circuit transmission line in Romania; Study of the possible solutions, technical and economic comparison

Romania´s inclusion in the European transport network and implementation of Aeolian turbines in massive groups imply increases in the transport capacity of some lines, required to transport or evacuate high powers over the existing capacities. To uprate the 220 kV double circuit line Bucharest South-Fundeni, its re-conductoring was considered. In this respect, new conductors with increased ampacity and adequate equipment were proposed. Six types of conductors were analyzed and compared to the classical ACSR conductor. The scope of this study was to investigate the feasibility of using HTLS conductors to achieve a higher rating without any modification to the existing structures or without increasing conductor sags. Only the most important results obtained from the comparative analysis of the re-conductoring solutions are further described. All the costs presented are calculated for one km of three-phase circuit equipped with one conductor per phase. Costs have been estimated, with an error of +/-25%. This includes costs related to materials, construction, maintenance and power losses.