Wide Area Measurement Systems (WAMS) have been developed over the last 10 years as a means to address the numerous problems that have arisen as the level of inter-connection and complexity has increased in electric power networks.

Initial implementation, consisting of transducers monitored through SCADA has successfully evolved into the real time transfer of synchronized power system data in the form of sequence components generated by Phasor Measurement Units (PMUs). The Phasor Data Concentrator (PDC) that receives the data from PMUs and other transducers provides signal analysis; and, can be used to implement state measurement, wide area protection, and control. Early uses, which included monitoring system dynamics and updating system models, are now being augmented with those involving protection and control.

The evolution of this effort is described along with applications, existing and prospective, with several examples.

R. Jay Murphy (M) received his doctorate in Electrical Engineering from Rensselaer Polytechnic Institute in 1971. He is founder and president of Macrodyne Incorporated. He is presently involved in the development of synchronized data acquisition systems for the electric power industry. His earlier work includes electrical and optical system and component design with IBM and Sprague Electric. He developed the first digital laser Doppler velocimeter and the first microprocesspr based digital fault recorder. Dr. Murphy is the author of numerous papers in such diverse areas as microwave network theory, digital and analog circuit design, industrial controls, electric utility instrumentation, and theoretical mathematics. He holds several patents and is a member of the AIAA, and IEEE - PES and AES; as well as several honorary societies.