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集中质量法模拟覆冰在架空线脱冰动张力实验中的适用性研究

DOI: 10.13334/j.0258-8013.pcsee.2014.12.019, PP. 1982-1988

Keywords: 输电线路,架空线脱冰,脱冰动张力,模拟实验

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Abstract:

覆冰架空线的脱冰动张力会对输电线路造成严重的破坏,研究架空线脱冰动张力的规律对冰灾区线路设计具有指导意义。目前架空线脱冰振动实验研究,对覆冰的处理主要采用悬挂或附着等效集中质量法。该文研究了等效集中质量方法对架空线脱冰动张力的影响规律,以确定悬挂或附着集中质量的模拟方法的合理性和适应范围。在实验室分别采用架空线真实覆冰和集中质量法来模拟覆冰,对孤立档架空线的脱冰振动进行了实验分析,对比研究了具有真实覆冰和等效集中质量模拟覆冰的架空线的脱冰振动特性。结果表明:两种实验方法得到的架空线脱冰振动张力时程曲线形状,在脱冰后初期阶段基本吻合;由于真实覆冰使架空线的刚度增大、阻尼增大,因此与集中质量法相比,真实覆冰法的动态张力峰峰值大、振动频率高、衰减速度快。

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