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AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsEdmund O. Schweitzer, III, Jeffrey B. Roberts, Armando Guzman-Casillas, Joseph B. Mooney, Luther S. Anderson
Estimating the term…
The system includes a plurality of protection application elements to accomplish various power system protection functions, including for example line protection, line fault location, current direction determination, breaker protection and synchronism check, among others. The system includes local sources of current and voltage information for the protective functions as well as a receiving section for receiving such current and voltage values from a remote source, such as another protection device, as well as other necessary input information for the protective functions. A selection logic section is responsive to the output of the protective function elements, as well as the local and remote data to determine whether the primary or local sources are to be used. The outputs of the protective function elements are used by an output section to control circuit breakers and the like and are also transmitted, with the local and remote source quantities, to other protective devices.
A system for selecting voltage and current sources for a protective relay device for protection and control of electric power systems, comprising:
Dependencies are inferred from the claim text.