Anti-vibration Measures of Ultrahigh Strength Steel Cored Aluminum Strand for Long-Span Overhead Line

Abstract

It is the key issue for long-span overhead line to take anti-vibration measures for the ultrahigh strength steel cored aluminum strand. Taking the ultrahigh strength steel cored aluminum strand JLHA1/G6A-500/230 as the example, the aeolian vibration control measure for ultrahigh strength steel cored aluminum strand is tested based on the balance principle of conductor aeolian vibration. The result shows that the dynamic bending strain of the conductors exceeds120×l0-6 when the test frequencies are in the range of 14Hz~70 Hz. In order to reduce the dynamic bending strain of the conductors, the anti-vibration measure of the β damping wires combined with vibration dampers is used. The β damping wires have very good energy dissipation capacity within wide frequencies. The layout of the damping wires is designed as combinations of 3.8 m , 3.2 m, 2.7 m...0.9msingle lace damping lines respectively, two vibration dampers are arranged in the mid span of the first and second damping wires. After taking the anti-vibration measure, the maximum dynamic bending strains of the conductors is controlled below 120×l0-6, which meet the standard requirements. This study provides useful reference for long-span overhead line.