覆冰舞动是严重威胁输电线路安全运行的自然灾害之一。2015年1月28日，湖北地区多条500kV超高压线路发生覆冰舞动，造成放电、跳闸、断线等数起严重事故。本文根据该地区气候变化过程，以及线路参数、覆冰条件，气动参数以及防舞器布置方案等情况，利用基于曲梁模型并考虑防舞器分布的输电线路覆冰舞动三自由度方程，得到荆林I、II、III回，三江II回，南荆I线湖北段等线路覆冰舞动的平均方程，并依此对其进行了非线性动力学理论分析。得到结论：1.本次事故是典型的Nigol舞动；2.双摆防舞器的合理安装可有效提升线路的防风抗振能力；3.在理论计算基础上，给出了双摆防舞器的合理布置数量和次档距建议。本文分析过程和结论为提升输电线路防风抗振能力打下理论基础。
Abstract
Safe operation of power transmission lines was seriously threatened by galloping. In Hubei on January 28, 2015, severe accidents caused by galloping had made several 500kV Extreme-High-Voltage lines shut down, partial discharge and disconnection fault. In light of climatic change process, structure of transmission lines, ice formation and arrangements of anti-galloping fittings, it was the average equations of galloping of Jinlin I, II, III Circuits, Sanjiang II Circuits and Nanjing I Lines that were obtained and detail analyzed in this paper, which was based on three freedom nonlinear dynamic equations that considered curve models and arrangements of anti-galloping fittings, and would reveal nonlinear dynamic properties, such as the conditions and processes of galloping’s occurrence and development. Aimed at improving the theoretical cognitive level of galloping, and proposing to improve the power grid's ability against icing galloping, following conclusions were gave: First, this accident happened in Hubei belonged to typical Nigol galloping; Second, reasonable arrangement of anti-galloping devices could effectively improve the conductors’ ability of anti-vibration; Finally, some suggestions based on theoretical computations were gave to make the arrangements of anti-galloping fittings more reasonable.
关键词
超高压 /
特高压 /
架空线路 /
覆冰舞动 /
非线性动力学
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Key words
EHV /
UHV /
Overhead Transmission Line /
Galloping of Iced Overhead Transmission Line /
Nonlinear dynamics
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参考文献
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