Algorithms based on differential protection for comparing the instantaneous values of two currents, and the segmentation and recovery of a distorted current, are considered from unified positions. A key position is localization of that subset of observed modes that is alternative to modes of a fault of the object being protected. Localization is accomplished by means of two-coordinate measurements that are formulated on a regular basis by the least squares method. In addition to the traditionally-used differential and brake currents, estimates of adaptive factors of one of the compared currents are introduced, including for readings with a deviating argument, and also the discrepancy of outcome of the optimization procedure. The method of localization creates favorable possibilities for isolation of alternate modes. The image regions of the alternate modes on the planes of different two-coordinate measurements consolidate the detection capabilities of the AND logical action. The simulation model of a double-wound transformer in which currents of magnetization of cores are considered is taken as an example of the usage of the described algorithms. The demarcation of exterior short circuits and turn-to-turn short circuits in a winding of the upper voltage is explored.
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Translated from Élektricheskie Stantsii, No. 7, July 2019, pp. 44 – 49.
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Atnishkin, A.B., Lyamets, Y.Y. Modifications of the Algorithm of Differential Protection. Power Technol Eng 53, 605–610 (2020). https://doi.org/10.1007/s10749-020-01124-y
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DOI: https://doi.org/10.1007/s10749-020-01124-y