LIU Min1,YAN Zhi-tao2,1,FENG Shang-ming1,YOU Yi1,3
JOURNAL OF VIBRATION AND SHOCK. 2018, 37(3): 223-229.
Icing conductors’ ice-shedding may lead to damages of end fittings, wires and towers, and even tower collapse and other machinery accidents. A three-span 1:50 scale model tests for icing conductors were conducted to obtain conductor’s ice-jump height, conductor’s tension force and axial force changes of insulators. In tests, ice-shedding loads were simulated with suddenly dropping dead-weights from conductors. Seven ice-shedding cases were studied with different magnitudes of ice-shedding, positions of ice-shedding span, ice thicknesses and wind velocities, etc. The results showed that conductor side-span ice-shedding causes larger vertical vibration than mid-span ice-shedding does, conductor’s jumping height increases by near 7% and conductor’s tension force rises obviously; when there are wind loads, conductor’s ice-shedding vibration is affected by aerodynamic damping, conductor’s jumping height and vibration period become smaller, conductor tension force and insulator axial force increase with increase in wind loads.