To evaluate the applicability of an aerodynamic force model based on quasi-steady theory for simulating the galloping of overhead transmission lines subjected to ice and snow accretion, vibration tests were performed in a wind tunnel using a section model of four-bundled conductors. First, galloping with large amplitudes at low frequencies was successfully simulated in a wind tunnel test using the unique support technique proposed here in the vertical, horizontal, and torsional directions, in the same manner as the galloping in actual lines. The aerodynamic force due to torsional velocity can be formulated by considering the quasi-steady aerodynamic forces acting on the sub-conductor, while it is not included in the quasi-steady aerodynamic force formulated for the entire four-bundled conductor. Time history analysis considering the aerodynamic force caused by torsional velocity agrees well with the test results.
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