Viabilidade técnica-econômica para a utilização de condutor neutro em redes elétricas de distribuição rural

Abstract

The electric energy utilities in Brazil choose two systems to distribute networks. The first is the system multilanded. In this system, there is a continuous neutral conductor across the network, being interconnected to the embankment of the substation. This conductor is also connected to all grounds installed over the network, most commonly both primary and secondary. The second system does not use this neutral conductor along network, thus it is maintained only in the neutral transformer delta star to attend single-phases consumers working with low voltage. The electrical embankments play a fundamental importance in distribution systems: they protect the users of the equipment from lightning, they give improvements in the performance of protective devices and they also transfer static charges accumulated in machines and equipment to the land. In this work, it will be analyzed the assembly cost of 1 km of rural distribution network to CEMIGs neutral system multilanded and CELPAs non-neutral system, analyzing the technical and economical viability for installing these conductors.