Testing Relay Performance During the 2003 Blackout
On August 14th, 2003, stable and unstable power swings occurred on the Northeast Power Coordinating Council (NPCC) bulk transmission system. Distance protection relays tripped out on some of the lines during stable power swings. These events contributed to the blackout of many parts of the northeast United States and Canada that occurred on that date, and brought to attention the need to evaluate Power Swing protection for bulk transmission systems. The NPCC created a team to investigate the event, analyze relay operation, and recommend improvements to the line distance protection performance for such events.
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