Dynamic modeling and simulation for transmission line galloping

This paper presents a new dynamic model for the simulation of power-transmission-line galloping. The energy approach using the assumed mode method was used to derive equations of motion for a single transmission line and double transmission lines connected by spring spacers. Equations of motion are expressed in matrix form, which simplifies numerical analysis and saves computational time. The dynamic models were verified experimentally by comparing theoretical natural frequencies with measured natural frequencies of real transmission lines installed in the test site. Accelerometers and a CCD camera were used to measure vibrations, and an image processing technique was used to trace a circular target mounted on the line. Experimental results are in good agreement with theoretical results, which validate the dynamic models derived in this study. Galloping forces were modeled by assuming quasi-steady aerodynamic lift and drag, which enabled us to predict the galloping phenomena. Numerical simulation results are presented.