Abstract
A comprehensive study of the relaying quantities available for the differential protection of transmission lines considers the performance of both the summation transformer and the phase-sequence current-segregating network. From this study, it is possible to determine the performance of a protection scheme utilising typical summation devices for differential protection. The optimum selection of protection characteristics is discussed and a comparison made with the polar characteristics of protection equipments currently in use. Some limitations in present protection methods are pointed out. The analytical work uses a mathematical model of the power system, and the fault analyses are carried out using a large high-speed digital computer. The application of the computer to the solution of these problems is described.
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