跳线风偏闪络原因分析及预防措施研究
Research on Flashover Factors of Jumper Wires Caused by Windage Yaw and Its Preventive Measures
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摘要:
针对南方电网沿海强风区域易发生耐张塔跳线(串)风偏闪络的现象，从分析跳线(串)风偏跳闸的主要原因入手，参考数种国际主要输电线路设计标准有关突风率的取值规定，详解南方电网《输电线路防风设计技术规范》有关条文的规定由来，并剖析比较不同跳线方式对抑制跳线风偏闪络的作用。研究表明，适当提高跳线风压不均匀系数取值可改进跳线风偏计算模型对自然风的脉动特性考虑不足的问题，同时在沿海强风区域线路中推广采用刚性跳线可以显著抑制耐张塔风偏跳闸事故率。 Abstract:In consideration of the phenomenon that jumper flashover is easy to occur in southern coastal area of strong wind, the article analyses the main reasons of flashover, references the value of gust wind factor from several international design standards, explains the origin of the relevant provisions of "Design specification for transmission line against typhoon" proclaimed by China Southern Power Grid, and it compares different kinds of jumper string's effects on inhibition of jumper flashover. The research shows that an appropriate increase in the span factor of jumper can improve the swing calculation model on insufficient considering of the natural wind turbulence characteristics, and to promote the use of rigid jumper can significantly inhibit the swing trip accident rate of tension tower in the coastal area of strong wind.
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