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Stability Evaluation of the Transmission Line by using Galloping Simulation

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Abstract

Galloping phenomenon is one of the vibrations caused by icing. If galloping phenomenon continues, short-circuit or ground fault may occur, so analysis of galloping phenomenon through research on transmission line stability is necessary. The DenHartog method, which is frequently used for the galloping stability determination of the transmission line, considers only the vertical movement of the transmission line. In this study, we analyze the motion of multi-degree-of-freedom objects, using a computer aided engineering program. We modeled transmission lines as a multi mass-spring-damper systems using RecurDyn, which is a multibody commercial dynamics analysis program to analyze the galloping phenomenon dynamically. Damping inside transmission line derived from the Rayleigh damping theory through the free vibration experiment of transmission line. ANSYS Fluent, a flow analysis program, was used to derive the aerodynamic coefficients for transmission line with asymmetric cross-section. Using the derived aerodynamic coefficient, we confirmed the galloping occurrence condition of DenHartog method and modeled the wind load acting on the transmission line to conduct galloping simulation. Through the analysis of the motion of a multi-degree-of-freedom transmission line, the occurrence of galloping was classified into ovoid and vertical trajectories, and the case of no galloping was defined as regular trajectory, and the range of angle of attack that causes the instability of transmission lines was defined.

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Authors and Affiliations

  1. Graduate School of Mechanical Design Engineering, Pukyong National University, 365, Sinseon-ro, Namgu, Busan, 608-739, South Korea

    Yun-Ji Oh

  2. Department of Mechanical Design Engineering, Pukyong National University, 365, Sinseon-ro, Namgu, Busan, 608-739, South Korea

    Jeong-Hyun Sohn

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  1. Yun-Ji Oh
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Correspondence to Jeong-Hyun Sohn.

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Oh, YJ., Sohn, JH. Stability Evaluation of the Transmission Line by using Galloping Simulation. Int. J. Precis. Eng. Manuf. 21, 2139–2147 (2020). https://doi.org/10.1007/s12541-020-00399-5

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  • DOI: https://doi.org/10.1007/s12541-020-00399-5

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