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. A method is proposed for calculating the initial value of the periodic term of the short- circuit strength of a dual-circuit overhead transmission line using multiphase replacement circuits. The method takes into account the electromagnetic connections between the wires of the dual-circuit overhead line and the ground to transient modes. The calculation model will allow to take into account the influence of the internal properties of the dual-circuit overhead line when calculating the three-phase short-circuit currents at the design stage, which will significantly improve the accuracy of the choice of relay protection settings and line automation. The model was tested in Matlab Simulink.

THE EFFECT OF ELECTROMAGNETIC COUPLING BETWEEN WIRES DOUBLE- CIRCUIT OVERHEAD LINE AND THE GROUND ON TRANSIENTS