Substation automation systems in review

Screen-based substation automation projects are becoming increasingly common. Computerized substation automation systems have been installed for at least 5 years. In response to a number of issues, such as the safety of operational staff that operates a diverse range of equipment, operational efficiencies, and space savings, many electric utilities have incorporated with these systems a screen-based person-machine interface (PMI, which is also known as a graphical user interface). The PMI acts as the operating position for field operators when visiting the substation for either routine or emergency switching tasks. This article reviews the impact that the PMI has had on the substation operational systems of a number of Australian and North American power utilities. The proposed and actual benefits and disadvantages of the PMI are described. The advantages of screen-based substation automation systems significantly overshadow the disadvantages. These systems should become the standard for all power utilities as they strive for improved asset performance and staff efficiency and safety, and the delivery of better customer service.