Effect of gap on self-damping characteristics of Large Span Transmission Lines

In order to grasp the influence of the gap between aluminum layer and steel core layer on self-damping characteristics of large span transmission lines, taking the ultrahigh strength steel cored aluminum strand JLHA1/G6A(JX1)-500/230 as the example, the self-damping power and vibration amplitude of the conductors with the damping grease in the gap is tested. The breeze excitation force was simulated by electromagnetic vibration exciter, and wire vibration data was collected using contact eddy sensor, which test self-damping power and vibration amplitude. The tested results show that the gap can chance the self-damping characteristics of the conductors, and has a great influence on its anti-vibration. When the gap increases from 0.75mm to 1mm, the self-damping power of the conductors increases obviously, and the vibration amplitude of the conductors decreases. In addition, the influence of the gap on self-damping characteristics of the conductors in middle and low frequency bands is significantly higher than that in high frequency bands. The research results can provide certain test support for the application of the conductors in large span engineering.