Abstract
IN the design of a protective relay, the first stage is to select the characteristics which will give the clearest distinction between faults in the protected section and all other conditions. Fig. 2.1, for example, shows an R/X diagram on which the characteristic circle of a mho relay fits around a shaded area which includes the impedances (including arc resistance) for all positions of fault within the protected zone; with such a characteristic the relay will not trip during power swings, or on faults other than those in the protected section and involving the phase with which the relay is associated (47) (58).
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© 1968 Albert Russell van Cortlandt Warrington
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van C. Warrington, A.R. (1968). Relay Design and Construction. In: Protective Relays. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-6459-7_2
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