Study On Aeolian Vibration Of Overhead Conductors With Dampers

Aeolian vibration of overhead electrical transmission lines, also referred to as conductors, are very common and can lead to fatigue damage. Aeolian vibrations are usually caused by winds ranging in velocity from1to7m/s and can occur at frequencies from3to150Hz with peak-to-peak displacement amplitudes of up to one conductor diameter. This paper research object is aeolian vibration of a conductor span with dampers. It contents include:Compiled an analytical software for vibration signal. This software has three analysis modules such as the correlation analysis, spectrum analysis and single input frequency response analysis, it involves autocorrelation analysis cross correlation analysis, amplitude frequency analysis, phase frequency analysis and power spectrum.Theoretical studies for aeolian vibration. Use the energy balance method as the basic method for theoretical study and the tight beam as the model. Based on this, the computational formula of total wind power input and total power dissipated through conductor self-damping have been derived. Finally, make a detailed comparison for the classic wind power curve:Diana wind power curve and Slethei wind power curve, and combining the domestic scholars’conclusion getting the conclusion that Diana wind power curve is more suitable for overhead conductor operation situation than Slethei wind curves.Analyze for the energy dissipation mechanism and mechanical properties of dampers. Analyze the energy dissipation mechanism in detail by vibration model figure and the mechanical property. Give the computational formula of the power dissipated by the dampers.Finally, In order to verify the results of theoretical studies, the indoor aeolian vibration simulation tests are designed. First, using inherent frequency test to confirm the rationality and working reliability of sensors. Based on this, test the power dissipated through conductor self-damping, verified the conclusion that following the tension’s increase the power dissipated through conductor self-damping is decrease. Lastly, three suggestions about the choice of excitation point, sensors placed position and exciting frequency have been given experience with the test.