An assessment of sensitivity of the measuring elements of relay protection was performed. Based on simple examples of the generator-transformer unit protection from symmetrical short circuits, it was shown that the sensitivity factor is not a sufficiently objective measure of sensitivity of the relay protection. It was suggested to use a more objective measure, which is a characteristic of sensitivity to transient resistance at the fault location (dependence of the transient resistance, at which the protection stops tripping, on the fault location).
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Translated from Électricheskie Stantsii, No. 10, October, 2017. pp. 38 – 41.
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Romanov, Y.V., Voronov, P.I. Assessing the Sensitivity of Relay Protection. Power Technol Eng 51, 728–731 (2018). https://doi.org/10.1007/s10749-018-0900-x
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DOI: https://doi.org/10.1007/s10749-018-0900-x