结冰分裂导线舞动短路分析

Analysis of galloping amplitude of bundled iced conductors

针对结冰分裂导线舞动短路问题,从功能的角度提出了一种分析方法。在正弦模态的假设下,根据功能关系导出了结冰分裂导线舞动振幅经历一个周期增量的表达式,由此导出了结冰分裂导线舞动短路判据。舞动振幅增量的表达式说明了作用在结冰分裂导线上的气动力的线性项与非线性项在舞动振幅不同阶段的作用。结果显示:当振幅较小时,气动力非线性项对应的功较小,振幅增长较慢;当振幅较大时,气动力非线性项对应的功成为气动力的功的主要部分,振幅增长较快。因此,在舞动短路分析中,必须考虑气动动力非线性。

Aiming at short circuit aroused by galloping of iced bundled conductors,an analysis method of amplitude of galloping of iced bundled conductors is proposed from the relation between work and energy.The expression of amplitude increment of galloping of iced bundled conductors through a cycle is educed under the sine mode hypothesis.The expression of amplitude increment explains the action of linear item and nonlinear item in aerodynamic forces on iced bundled conductors during dissimilarity phases.The conclusion is that the work of nonlinear item in aerodynamic forces is smaller and the amplitude of galloping of iced bundled conductors increases more slowly,when the amplitude of galloping of iced bundled conductors is smaller;the work of nonlinear item in aerodynamic forces is prime part of the work aerodynamic forces and the amplitude of galloping of iced bundled conductors increases faster,when the amplitude of galloping of iced bundled conductors is larger.Therefore,the nonlinear item in aerodynamic forces must be considered in analysis of short circuit aroused by galloping of iced bundled conductors.