架空线路大跨越工程运行前后防振效果对比试验研究

通过对运行13 年的某500 kV 大跨越导线进行微风振动防振效果时效分析试验研究，证明随着运行时间的推移，线路导地线的自阻尼特性及防振措施性能将逐步劣化，建设初期所设计的防振措施将有可能不再有效地抑制微风振动，造成微风振动超标，这将会严重威胁大跨越线路的安全可靠运行。因此，在大跨越防振措施设计时，推荐方案与技术条件间必须有一定的安全裕度；此外，应定期进行现场测振试验，以便在振动超标的初期能早发现、早治理。

Comparison Experiment of Vibration Prevention Effects of Large Span Overhead Line Due to Aging

Aging experiment studies of aeolian vibration prevention effects on a 13-years-old operating 500 kV conductor with large span show that with the passage of time,the self-damping characteristics and the effect of vibration prevention measures of conductor and ground wire will gradually deteriorate.The aeolian vibration prevention measures designed earlier will no longer effective,resulting in excessive aeolian vibration.This may seriously threaten safe operation of lines with large span.Therefore,in design stage,there must be certain safety margins between recommended schemes and technical conditions;in addition,regular onsite vibration tests are necessary to discover and fix excessive vibration at early stage.