多跨覆冰输电线路脱冰振动分析

Analysis of ice shedding vibration of multi-span transmission line

多跨输电导线系统包含绝缘子、导地线等部分,在脱冰和风荷载作用下的机制和现象均与单跨不同。本文基于大型通用有限元软件ANSYS,建立了多跨覆冰输电线路的振动分析模型。对多跨覆冰输电线路的振动分析表明,从一跨增加到五跨,脱冰跨的跨中位移跳跃幅值随着跨数的增加而增加。耐直耐工况中耐张绝缘子的轴力幅值最大,但是脱冰后的绝缘子轴力也是随跨度增大而变大。悬垂绝缘子的轴力幅值随跨度增加而减小,但是脱冰后的轴力随跨度增大而增大。脱冰跨导线的张力也是在耐直耐工况中幅值最大,然而耐直直直直耐工况中脱冰后最大。边跨导线张力随跨数增加而降低。

The mechanism and the phenomenon of the ice shedding and wind induced vibration of the multispan transmission lines system including the insulator,the lead wire and other parts are different from the single span.In this paper,the vibration analysis model of a multi-span transmission line is established based on the large finite element software ANSYS.The vibration analysis of the multi-span transmission line shows that the amplitude of the displacement of the ice shedding is increased with the increase of the number of spans from one span to five spans.The axial force of the resistance insulator in the case of resistance-straight-resistance is the maximum,which is increased with the increase of the span.The amplitude of the axial force of the suspension insulator decreases with the increase of the span,but the axial force after ice shedding increases with the increase of the span.The tensile force of the conductor in the ice shedding span is also the largest in the resistance-straight-resistance case,while the axial force after ice shedding increases is the largest in the case of resistance-straight-straight-straight-straight-resistance.The tension of the edge of the edge is decreased with the increase of the cross number.