Abstract
The jumper wires of an extra-high voltage (EHV) transmission line in strong-wind areas in Northwest China frequently break down. We installed some acquisition devices to collect the data of the jumper wires and wind speed in the fault area of one 750-kV transmission line. We also developed a swing simulation machine based on the collected data. The machine could simulate the swing condition of the jumper wires under various wind speeds. We analyzed the broken aluminum wires obtained from the simulation experiment of jumper wires. Yield lines appeared on the surface of the broken aluminum wires in the simulation experiment. Proliferation of dislocation and grain deformation occurred in the broken aluminum wires using transmission electron microscopy observation. The results show that the aluminum wires in the experiment under a Level-6 wind and above were in a full yield state and demonstrated strain-fatigue failure condition. The fracture of the broken aluminum wires showed distinct strain-fatigue fracture characteristics using the scanning electron microscope fracture morphology analysis. From the combination of the abovementioned research, we conclude that the failure mechanism of the broken strands of the jumper wires of the EHV transmission line in the strong-wind area is mainly a strain-fatigue failure mechanism.
Highlights
IntroductionMany extra-high voltage (EHV) transmission lines have been built along the way [1], such as 750-kV transmission lines
China’s West to East power transmission project has transmitted the abundant electric energy in the west to the developed areas in Eastern China
We preliminarily concluded that the cause of the broken strand of the jumper wires is related to their reciprocating motion under strong winds
Summary
Many extra-high voltage (EHV) transmission lines have been built along the way [1], such as 750-kV transmission lines. These transmission lines pass through strong-wind areas in Northwest China. The transmission lines located in the strong-wind areas frequently break down, which cause large economic losses [2,3,4]. By considering the breakage of a 750-kV transmission line as an example, the economic loss can reach. The common failure mechanisms of broken conductor strands caused by wind load include aeolian vibration [5,6,7], subspan oscillation [8,9], and ice coating galloping [10,11,12].
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