Precise timing in electric power systems

Precise timing offers a new approach to system-wide controls. It enables measuring the system-wide AC phase as well as timing events and synchronizing controls. the Global Positioning System (GPS) is the first system to provide timing with enough precision to make this approach practical. GPS also provides the wide area of coverage, continuous availability, and high reliability required for power system control. A number of utilities, including the Bonneville Power Administration, have R&D programs for GPS timing systems or advanced protection and control systems based on precise timing. Several utilities have operational phase angle measuring systems and more will go into service in 1993. At least two utilities will start using GPS-based fault location in 1993