A power-factor-monitoring scheme used successfully to predict catastrophic failures of current transformers on the Tennessee Valley Authority's system is discussed. The method permits removal of the equipment from service before a failure occurs. Other monitoring and relaying schemes have also been evaluated, and the results are compared.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Cummings et al. (1988) studied this question.
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