EMAE'S experience in the substitution of the regulation systems of the underground power plant, Henry Borden

The aim of this paper is to present Henry Borden's regulation systems modernization. This power plant is located in Cubatao, Sao Paulo, and the company responsible for it is EMAE - Empresa Metropolitan de Aguas e Energia S/A. The modernization consisted in the total substitution of the regulation systems, which include the installation of digital electronic governors and potential regulation, indirect static excitation and auxiliary system of 125 Vcc. The aim of this project is: new composition of the security and operation liability conditions of the regulation system of the power plant; extension of usefulness with lower costs; faster answering time; decrease of the maintenance costs; improvement of operational performance especially during the instability occurrences in the system.