Experimental research on zipped ice-shedding of transmission line under the influence of multiple parameters
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Abstract:
The dynamic tension caused by the ice-shedding of the transmission lines will cause the line fracture and collapse. Taking a project as the prototype, this paper designed a test model of an iced conductor with scale ratio of 1∶30 on the basis of dynamic similarity theory to simulate the ice shedding of transmission lines, using electromagnet to control the shedding of concentrated weight in the cases of zippered and simultaneous ice-shedding. The influence of deicing velocity, deicing direction, elevation difference and vibration-proof hammer on the vibration response of transmission lines ice-shedding were studied. The results show that the displacement of zippered ice-shedding is lower than that of simultaneous ice-shedding. Whether it is zippered ice-shedding or simultaneous ice-shedding, the maximum jump height of zippared ice-shedding decreases with the decrease of the deicing velocity, and eventually reaches up to 50% of simultaneous ice-shedding. With the vibration-proof hammer, the jump height of zippered ice-shedding is more obvious.The maximum jump height of the mid span increases sharply with the increase of the elevation difference angle, and the deicing mode from the middle to both sides is the most unfavorable.
