Understanding microprocessor-based technology applied to relaying

Different technology has been used to implement protection functions that properly detect disturbances in the power systems and initiate the disconnection of the faulted components. Despite the developments of complex algorithms for implementing protection functions, microprocessor-based relays were marketed in the 1980s. Those relays performed essential functions, took advantage of the hybrid analog and digital techniques, and offered good economical solutions. The performance of these relays, however, was only adequate but their introduction did a lot of good to the highly conservative work of power system protection. Continuous advances in electronics, combined with extensive research conducted in microprocessor-based systems, led to a few applications in which a microprocessor relay performed multiple functions.

The following PDF is the report of the relaying practices subcommittee.

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