The crescent demand for electricity overloads the transmission system which requires constant increases to not be a hindrance to development. However, the construction of new transmission lines has faced many obstacles due to the difficulty to constitute new intervention area and the need to reduce environmental impacts. A very advantageous solution to these problems is the retrofit of the transmission lines, which can be made in many ways. One of the most common is the replacement of power cables, which manufacturers continually invest and create new materials to allow new options of design. Moreover, just retrofit lines already present problems of ampacity's superation, justifying the development of a multi-criteria methodology that adequately ponder the objectives during the choice of an adequate handle. The criteria used in this work are the maximization of height handle- round, ampacity and supervened of the line (in function of the exceeding ampacity) and, minimization of implantation's cost, losses and addition of efforts at the structures. The optimization problem involved is resolved by the Weighed Global Criterion Method. The results of the methodology (that effects the calculations of parameters of the available handles and selects to better to be installed) are presented for one line transmission of 230 kV installed at the state of Paraná.
Retrofit; Multiobjective Optimization; Transmission Line
