±500 kV德宝线大档距线路段防振方案试验研究

Research on Anti-vibration Optimization Design of Line Section with Large Span for ±500 kV Debao Line

摘要:

受冷空气过程影响，四川北部地区时常出现突发性降温及大风天气，导致架空导线微风振动动弯应变接近常规线路段安全阈值(200 με)，超过大跨越线路段安全阈值（120 με）的情况频繁发生；现有导线端部位置及常规防振锤长时间处于高强度工作状态，严重威胁四川电网运行安全。针对此问题，文中以1437 m档距的±500 kV德宝线424号至425号塔线路段为例，依照现有大跨越线路段防振设计标准，开展了防振设计效果评估试验优化研究，给出了更适用于川北大风区大档距线路段的防振设计形式。推荐的防振设计方案是在室内试验档上经过模拟试验、分析和优选后得到，满足防振相关技术要求，可最大程度降低输电线路大档距线路段出现致命缺陷的风险，确保区域电网长期安全稳定运行。

Abstract:

Affected by the cold air, northern Sichuan is easy to suffer from sudden low temperature and strong wind, which causes the dynamic bending strain of aeolian vibration of overhead conductors to approach the safety threshold (200 με) for ordinary section, or even exceed the safety threshold (120 με) for large-crossing section frequently. The end position of the existing conductor and the conventional vibration damper are in high-intensity working state for a long time, which seriously threatens the operation safety of Sichuan power grid. Aiming at this problem, taking No. 424 ~ 425 line section with a span of 1437 m in ±500 kV Debao line for example, and according to the existing anti-vibration design standards of large-span line section, the optimization research for the effect evaluation test of anti-vibration design is carried out, and the anti-vibration design which is more suitable for large-span line section in sudden low temperature and strong wind area in northern Sichuan is given. The recommended anti-vibration design scheme is obtained through simulation test, analysis and optimization in the indoor test, which meets the relevant technical requirements of anti-vibration. It is of great significance to avoid fatal defects in large-span line sections of transmission lines and ensure the long-term safe and stable operation of regional power grid.