An experience in determining a cost versus quality of service characteristic in order to define optimal investment level - Cyrillo, Ivo Ordonha; Pelegrini, Marcelo Aparecido; Quiroga, Gabriel Albieri; Almeida, Carlos Frederico Meschini; Tahan, Carlos Márcio Vieira; Gouvêa, Marcos Roberto (International Conference & Exhibition on Electricity Distribution -CIRED, 2017)