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The numerical modeling method of ice load and ice-shedding load on a transmission line is presented. The dynamic responses of multispan transmission lines with different structural parameters, including span length, number of spans, elevation difference between two suspension ends of the ice-shedding span, length of suspension insulator strings, and number of subconductors in a bundle conductor and conductor type, after ice shedding with different rates are investigated by means of the ABAQUS software. Based on the numerical results, it is discovered that the maximum vertical jump height of a transmission line after ice shedding, which determines the phase-to-phase and phase-to-tower insulation clearances, relates linearly to the sag difference of the conductor in the two static states before and after ice shedding. A simple formula to determine the jump height of a transmission line after ice shedding is suggested for the design of transmission lines in ice zones.