Galloping Simulation of the Power Transmission Line under the Fluctuating Wind
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Since the power transmission line (PTL) passes through the high mountain and heavy snowfall region, it is necessary to keep the stability of the PTL. In this study, PTL is modeled as the mass-spring-damper system by using multi-body dynamics analysis program. In order to analyze the dynamic behavior of PTL, a damping coefficient for a multi-body model is derived by using the free vibration test and Rayleigh damping theory. The icing cross section of the transmission line is considered by ellipse and triangle shape. The aerodynamic coefficient for each cross sections are derived by using the commercial CFD program, ANSYS Fluent. The fluctuating wind velocity is regenerated with time history by using Kaimal spectrum. Galloping simulations are performed for the elliptical and triangular iced sections by using the generated fluctuating wind velocity. There is an attack angle which showed the maximum vertical displacement according to the icing section. As a results, the triangular icing shape on the fluctuating wind velocity is more dangerous for the galloping phenomenon. This results can be available to the tower design for the power transmission line.
KeywordsPower transmission line Galloping Aerodynamic coefficient Multibody dynamics Rayleigh damping
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