Análise de potenciais perigosos gerados em redes elétricas que usam o solo como meio condutor

Abstract

Electrical grounding is essential for an electric power distribution system, even more so in networks with ground return. Amid the expansion of rural networks, the cost of a three-phase power grid can make the project impracticable, restricting the consumer to an MRT (singlephase with earth return) or MRN (single-phase with neutral return) network. Recent studies have proposed the construction of an innovative three-phase network that uses earth with a phase conductor. The T2F system (three-phase two wires) makes the installation of threephase networks in rural areas financially viable because, in addition to occupying a large part of the existing structure, it is not limited to single-phase power. However, security issues still need to be evaluated for this type of topology. This work aims to study the security characteristics so that such a network can be implemented. The equations and safety assessments were performed in a virtual environment, but the soil stratification was based on results measured in a test terrain that proved to be safe in its operation even with several grounding rods.