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The development, which took place in the digital electronics and telecommunications fields, among others, in addition to the necessity of a more effective control upon the electrical systems, more specifically, the energy substations, turned the development of supervisory control tools the main study object of many researchers. A project was presented to the Electrical Sector Technological Development and Research Program, aiming the development of a Substations Automation System. This on going project, supported by CEEE - Electrical Energy State Company, Rio Grande do Sul State, Brazil, exists since 2002. We present what has already been concluded in terms of data acquisition and transmission. Future works are going to present the Person-Machine Interface development, security procedures implementation as well as the actuation system and the realized tests including the whole system.