Generator Backup Overcurrent Protection

  • David S. Baker
  • Published 1982 in IEEE Transactions on Industry Applications


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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Cite this paper

@article{Baker1982GeneratorBO, title={Generator Backup Overcurrent Protection}, author={David S. Baker}, journal={IEEE Transactions on Industry Applications}, year={1982}, volume={IA-18}, pages={632-640} }