间隔棒对塔线体系脱冰跳跃的抑制研究

Control Effect of Phase Spacer on Jumping Induced by Ice-shedding for Iced Wires of Tower-line System

输电线路电力事故主要由导线微风振动、导线舞动和覆冰导线脱冰跳跃3种情况引起。其中覆冰导线脱冰跳跃使得导线跳跃较大的幅度,导致相闻间距不足引发电气事故,且较大的导线跳跃易引发机械事故,在三相导线呈竖直排列的线路中,脱冰跳跃引发的危害尤为严重。针对三相导线呈竖直排列的输电线路,建立输电铁塔-线-相间间隔棒体系的三档有限元模型,当覆冰导线脱冰跳跃时,在不同的脱冰相组合下,研究相间间隔棒对塔顶位移的抑制规律,并对几种相闻间隔棒布置方案进行研究,得出在档距的2/9、1/2、7/9处加装相闻间隔棒是最优布置方案。

At present, the power accidents in transmission line are mainly caused by conductor aeolian vibration, conductor galloping and conductor jumping induced by ice-shedding for iced wires. Especially, the jumping with ice-shedding makes the wires larger amplitude jumping, resuhing the insufficient phase spacing which is easily leads to electrical and mechanical accident. In three-phase vertically arranged transmission line, the damage caused by the jumping with ice-shedding is particularly serious. According to the three-phase vertically arranged transmission line, the paper establishes a finite element model with three-grade of transmission tower-wires-interphase interval spacer system, discusses the control of the spacer on the tower top displacement when the conductor jump occurs, considering different ice-shedding combination, expounds several arrangement of the spacer, and comes to the conclusion that the spacer can be installed at three position respectively including two-ninths, a half and seven-ninths of the span, which are optimum arrangements of the spacer.