A Power Rate Relay for System Applications

A solid-state power rate relay to aid system preservation has been developed by the U.S. Bureau of Reclamation. The device is sensitive to a preselected combination of magnitude, direction of flow, and rate of change of power. Depending on application requirements, the relay may be used alone or in combination with acceleration relays to sense conditions which threaten system integrity and to initiate the appropriate action to maintain system stability.