Specifying excitation systems for procurement

With today´s microprocessor technology, digital excitation systems have become very versatile compared to their analog voltage regulator predecessors. Full function digital excitation systems come equipped with various operating modes necessary to control terminal voltage on the synchronous machine. In addition, a full complement of excitation limiters is provided to ensure control of the synchronous machine over a wide range of operating conditions. When specifying new excitation systems, it is important to consider all of the various factors that can affect the successful purchase of the new equipment. These include but are not limited to environment, location of the excitation system, applicable specifications, agency requirements, performance, and ratings. This paper discusses considerations involved in specifying the excitation system foPr a project.