Mechanism analysis of rain-wind induced vibration on high-voltage transmission line

Under rain-wind conditions, rain-wind induced vibration on high-voltage transmission line often occurs, this kind of vibration intensifies the fatigue of high-voltage conductors and tower collapse. The mechanism of rain-wind induced has aroused wind attention in power engineering. The presence of raindrops and wind associated with electric filed maybe the main cause of this phenomenon. In the conditions of rain-wind excitation, raindrops hit the transmission line. The suspended raindrops may be reformed as upper rivulet and lower rivulet. The rivulets are enlarged as a cone shape with the electric field of high-voltage conductor. The motion of upper rivulet and its effect on the original cross-section formation of the high-voltage conductor are likely to be the cause of rain-wind induced vibration. Based on the mechanism, a two-dimensional model of rain-wind vibration is established based on D'Alembert principle. Taking the conductor LGJ-240 as an instance, we investigate the effects of wind velocity, rivulet position, and electric field strength on the vibration amplitude. Mechanism and conclusions can be used as references for constructing high-voltage transmission, upgrading the existing lines and controlling vibration.