the operating condition of a group of interconnected synchronous machines in which the angles of deviation between two or more machines vary up to the final loss of synchronism or until synchronism is restored Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=603-03-16
the operating condition of a group of interconnected synchronous machines in which the angles of deviation between two or more machines vary up to the final loss of synchronism or until synchronism is restored