Influence of Transmission Lines on Dynamic Characteristics of Transmission Tower

The influence of transmission lines on dynamic characteristics of transmission tower should not be ignored due to the heavy quality of transmission lines. The finite element models of independent tower and transmission tower-line system are established by ANSYS. The modal analysis is carried out to study the influence of transmission lines on dynamic characteristics of transmission tower. Meanwhile, it is verified by experimental modal analysis. Results show that, the tower-line coupling effect has a great influence on dynamic characteristics of transmission tower. The coupling effect strengthens the vibration intensity. In terms of frequencies, it mainly affects longitudinal bending mode and torsional mode frequencies of transmission tower, but has little effect on transverse bending mode frequency. Therefore, the influence of tower-line coupling effect must be considered in vibration reduction design of transmission tower-line system.

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