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Generator Backup Overcurrent Protection

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1 Author(s)
Baker, D.S. ; Brown and Root, Inc., P. O. Box 4574, Houston, TX 77210.

A concern that the characteristics and correct application of the generator backup relay are misunderstood is addressed in this report to the Power Systems Protection Committee. It is inherently a secure device, and rarely has the opportunity to operate in its intended capacity. So the question was asked, ``Do generator backup overcurrent relays really protect anything?'' In response a description of the function and operating characteristics of the backup relays, a discussion of generator fault current behavior, examples of relay settings for a typical application, and methods and criteria for determining that the relay both protects the generator and operates selectively with other protective devices are included.

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Industry Applications, IEEE Transactions on  (Volume:IA-18 ,  Issue: 6 )