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Numerical modeling of an overhead transmission line section and the digital simulation of stochastic wind field, to which the transmission line section is exposed, are presented. Time-domain analyses of typical transmission line sections in stochastic wind fields are carried out by ABAQUS software. It is discovered that the numerically determined dynamic swing angles of the suspension insulator strings in the transmission line sections are larger than those calculated with the formulas proposed in the technical code for designing overhead transmission lines. A dynamic wind load factor is suggested to be introduced into the formulas proposed in the design code.