Issues are examined in the calculation of the secondary currents of an arc in the implementation of single-phase auto-reclosing (SPAR) for elimination of unstable single-phase faults of 500 and 750-kV ultra-high-voltage lines. Dependences are shown for the backfeed arc extinguishment time, and the SPAR currentless pause recommended in the references, on the amplitude of the forced component of the secondary arc current. A graphical method is proposed for the calculation of secondary arc currents in ultra-high-voltage lines under the condition of SPAR currentless pause. The adequacy of the modeling of a backfeed arc was confirmed by a comparison of the calculated and experimental data from a 750-kV 525-km line. Examples are presented of the application of the graphical method proposed in this article for calculation of secondary backfeed arc currents in 500 kV lines of various length. The features of the implementation of SPAR in 300 and 1000 km lines are noted, and in particular, the effect of zero-power reactors connected to the neutral of the shunt reactors. An example of the implementation of SPAR using automatic phase shunting (APS) in a 500 km line is also examined.
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Translated from Élektricheskie Stantsii, No. 4, April 2021, pp. 35 – 40. DOI: 10.34831/EP.2021.1077.4.006
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Krasil’nikova, T.G., Makhmudov, K.A. Graphical Method for Calculating Secondary Arc Currents of an Arc in High-Voltage Lines. Power Technol Eng 55, 462–466 (2021). https://doi.org/10.1007/s10749-021-01382-4
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DOI: https://doi.org/10.1007/s10749-021-01382-4