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



Following PDF is the report of the relaying practices subcommittee.

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