The features of a new protective relay scheme are described. The scheme is designed to remove underexcited a-c generators from the system, upon occurrence of undervoltage, before loss of synchronism occurs. The relay development and its operating characteristics are described, Calculations required to determine generator behavior after loss of field are also presented to make the application of this scheme easily applied to generators on any system.
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Crossman et al. (1942) studied this question.
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