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This paper is a review and supplement to the original paper "Recent Practices and Trends in Protective Relaying" published in 1960 and its supplement published in 1964. IEEE Trans., PAS VOL 78, 1959, Pg. 1759-79 and PAS VOL 83, 1964 Pg. 1064-69.
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IEEE Report (1981) studied this question.
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