特高压大截面导线冰跳高度及横向摆幅研究

Study on ice shedding jump height and maximum horizontal amplitude of ultra high voltage large-section conductors

采用数值模拟方法,分析档距、档数、高差、导线型号等常规参数条件下大截面导线脱冰动力响应特征,并在此基础上研究温度对脱冰动力响应的影响,分析获得大截面导线冰跳高度及横向摆幅的变化规律。研究结果表明:大应力范围下(15MPa^60MPa)导线脱冰后最大冰跳高度与脱冰前后导线静止状态下的弧垂差存在线性关系;最大横向摆幅与脱冰前后静止状态下风偏改变量之间分别在15MPa^25MPa和25MPa^60MPa应力范围内呈非线性和线性关系。在此基础上,采用数据拟合方法给出大截面导线最大冰跳高度和横向摆幅的工程实用简化计算公式,为重冰区线路设计提供指导。

With the development of ultra high voltage projects, large-section conductors are widely used in heavy ice areas. Numerical simulation method is adopted to study the dynamic response characteristics during ice shedding of large-section transmission wires under conventional parameters in this paper. The influence of temperature on the dynamic response of ice shedding is also studied. On this basis, the changing rules of ice jump height and horizontal swing amplitudes of large section conductor are obtained. According to the results of numerical simulation, the relation between the maximum ice jump height of the conductor after ice shedding under large stress range(15 MPa^60 MPa) and the sag difference in static state before and after ice shedding can be obtained. Moreover, the quantitative relationship between the largest horizontal amplitudes and the change of wind deviation in static state before and ice shedding can also be gained. Thus, the simplified engineering calculation formulas of the maximum ice jump height and the largest horizontal swing can be acquired, which provides guidance for the design of heavy ice area wires.