大跨越输电线路Beta阻尼线消振特性试验研究

Experimental Study on Damping Characteristics of Beta Damping Linefor Large Span Transmission Lines

准确掌握Beta阻尼线的消振特性是大跨越输电线路微风防振设计的关键问题。基于阻尼线微风振动特点,推导了Beta阻尼线谐振频率与其花边长度的计算公式,分析了阻尼线花边长度的合理取值范围,并结合IEEE输电导线振动测试指南,设计制作了大跨越输电线路Beta阻尼线的消振特性试验模型,研究了Beta阻尼线花边长度、数量以及花边弧垂对大跨越输电导线微风振动的影响规律。结果表明:Beta阻尼线花边长度与谐振频率、质量和材料抗弯刚度密切相关,花边长度不宜过长;阻尼线花边长度对输电导线的微风振动影响较大,花边长度不同,不同激振频率时的消振效果也不同,多花边组合的阻尼线相比于单花边阻尼线的防振频段更宽,防振效果更加;Beta阻尼线花边弧垂对输电导线微风振动影响较小。

It is a key issue to accurately grasping the vibration damping characteristics of Beta damping lines in the design of anti-vibration of long-span transmission lines.Based on the characteristics of aeolian vibration of damping line,the calculation formula of resonance frequency and lace length of Beta damping line is derived,and the reasonable range of lace length of damping line is analyzed.Combined with IEEE vibration test guide for transmission line,the test model of vibration damping characteristics of Beta damping line for long-span transmission line is designed and made.The influence of the length and the quantity of lace and the sag of lace on the aeolian vibration of long span transmission line is studied.The results show that the lace length of Beta damping line is closely related to the resonance frequency,mass and bending rigidity of materials,and the lace length should not be too long;the lace length of damping line has a great influence on the aeolian vibration of transmission line.The lace length is different,the vibration attenuation effect is also different under different excitation frequency,and the damping line with multiple lace combination has a wider anti-vibration frequency band and anti-vibration effect than that with single lace damping line.The influence of lace sag of Beta damping line on the aeolian vibration of transmission line is small.