Dennis Tierney, B. Kasztenny, D. Finney, D. Haas, B. Le
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Performance of generator protection relays during off-nominal frequency operation
This paper reviews the protection requirements for generators during periods of off-nominal frequency operation. It investigates the behavior of instrument transformers during these periods as well as the impact of frequency on the accuracy of protection operating quantities. Traditional methods for frequency tracking and compensation are reviewed. A novel approach, which provides excellent performance for very significant frequency deviations and can accommodate multiple frequency islands, is presented.
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