Cost analysis for transforming rural electrical distribution networks into three-phase: Three-phase two-wire versus conventional three-phase

This paper presents a methodology to support the hypothesis that the Three-Phase Two-Wire (TPTW) system is an excellent economic alternative for rural properties that do not have their electricity needs met by single-phase systems. It is necessary to convert these networks into three-phase systems so that the rural areas can offer new opportunities for economic development. However, the costs of such investments represent a great challenge to be overcome. In an early assessment, it may seem trivial that the TPTW offers a lower cost because of the reduction in construction elements; however, the choice of a distribution system is a task that involves a complex analysis of factors. To evaluate the costs involved, four main scenarios are examined, which are compared to the conventional three-phase system. This paper is unprecedented because there are no works in the technical literature that compare the choice of these technologies in terms of costs, especially as regards the TPTW system, whose technical issues are not yet fully established. The results of confirm that the TPTW system can overcome the economic challenges when the investments made in previous installations are considered or when the purpose is to take three-phase electricity to places without centralized generation.