Abstract
In order to validate quasi-steady aerodynamic force model, which is generally used in a galloping simulation of overhead transmission line, 3 DOF vibration tests with large amplitude at low frequency in a wind tunnel were performed using a sector model of four-bundled conductors. In the galloping simulation, by considering the quasi-steady aerodynamic forces acting on sub-conductor, the aerodynamic force due to torsional velocity can be formulated, which is not included in the quasi-steady aerodynamic force formulated for the whole four-bundled conductor model. Results of time history analysis for the experimental model without the aerodynamic force caused by torsional velocity differ drastically from the test results. On the other hand, results of time history analysis for the model considering the quasi-steady aerodynamic forces acting on the sub-conductor show similarity to the test results.
