紊流随机风场下多相多分裂覆冰输电导线舞动的相间闪络概率评估

Interphase Flashover Probability Evaluation of Multi-phase Multi-bundled Ice-covered Transmission Conductors Galloping in Turbulent Stochastic Wind Field

针对覆冰输电导线在紊流随机风场中舞动的相间闪络问题,提出了一种多相多分裂覆冰导线舞动的相间闪络概率评估方法。首先,通过生成覆冰导线在紊流随机风场中舞动时的随机风荷载,结合多相多分裂覆冰输电导线有限元模型对紊流随机风场中的导线舞动响应进行模拟;其次,通过等价极值分布法构建了多相多分裂覆冰输电导线舞动时的相间闪络失效准则,基于概率密度演化法发展了一种多相多分裂覆冰导线在紊流随机风场中发生非同步舞动的相间闪络概率评估框架;最后,对某单跨三相四分裂覆冰输电导线算例进行分析。结果表明:1)不同相对位置的覆冰导线相间闪络概率评估结果差异明显,并且相较稳态风场情况,紊流随机风场作用下的各相导线相间闪络概率密度曲线峰值位置左移,峰值存在明显的降低;2)随着紊流度的增加,各相覆冰导线在紊流随机风场中舞动时更易发生相间闪络;3)该跨覆冰导线的相间闪络概率随平均风速的增加呈现先升后降的变化趋势,不同初始风攻角工况的各相导线相间闪络概率差异明显。

Aiming at the interphase flashover problem of ice-covered transmission lines when galloping in turbulent stochastic wind field,we proposed an interphase flashover probability evaluation method of multi-phase multi-bundled ice-covered transmission conductors.Firstly,the stochastic wind load of ice-covered transmission conductors galloping in turbulent stochastic wind field was generated,and the galloping response in turbulent stochastic wind field was simulated by combining the finite element model of multi-phase multi-bundled ice-covered transmission conductors.Secondly,the failure criterion of interphase flashover of multi-phase multi-bundled ice-covered transmission conductors was constructed by an equivalent extreme value distribution method,and a probability evaluation framework of interphase flashover of multi-phase multi-bundled ice-covered transmission conductors in turbulent stochastic wind field was developed based on a probability density evolution method.Finally,an example of a single-span three-phase four-bundled ice-covered transmission conductor was analyzed.The results show that,(1)the results of interphase flashover probability evaluation of transmission conductors in different relative positions are obviously different,and compared with the steady wind field,the peak position of interphase flashover probability density curve of transmission conductors in turbulent stochastic wind field moves to the left,and the peak value is obviously reduced;(2)with the increase of turbulivity,interphase flashover is more likely to occur when the ice-covered conductors galloping in the turbulent stochastic wind field;(3)with the increase of average wind speed,the probability of interphase flashover of the ice-covered conductors first increases and then decreases,and the probability of interphase flashover of conductors in different initial wind attack angles is obviously different.