What are galloping vibrations in overhead transmission line conductors?

Galloping vibrations in overhead transmission line conductors refer to a type of oscillatory motion that can occur under specific environmental conditions, particularly in windy weather. This phenomenon is characterized by large amplitude, low-frequency oscillations of the conductors, which can result in significant mechanical stress on the transmission line towers and fittings. Galloping typically happens when the conductor’s aerodynamic surface interacts with the wind, causing alternating lift forces that lead to the conductor moving in a sinusoidal pattern. This can potentially lead to conductor cable wear, deterioration, or even failure if not managed properly. Galloping is particularly concerning in areas prone to ice accumulation, as the added weight can exacerbate the oscillatory motion.