不同覆冰状态下输电塔线体系脱冰及断线受力分析

ICE-SHEDDING AND BREAKING FORCE ANALYSIS OF TRANSMISSION TOWER LINE SYSTEM UNDER DIFFERENT ICING CONDITIONS

输电线路脱冰及断线对输电塔线体系所造成的影响一直受到人们的关注。利用ANSYS建立四塔三线的输电塔线体系有限元模型,计算不同工况下的输电塔线体系脱冰、断线过程,分析脱冰和断线的受力规律。结果表明:线路中上、下两排导线间距低于两排导线脱冰振动幅度的总和,可导致线路接触闪络;导线脱冰后导线张力振荡减小,并且振荡部分峰值会超过初始状态值;单根导线断线产生的冲击荷载大于两根导线断线产生的冲击荷载。

The effects of ice-shedding and break of transmission lines on transmission tower line system have always been concerned. The finite element model of transmission tower line system with four towers and three lines was established by ANSYS to calculate the process of ice-shedding and conductor break of transmission tower line system under different working conditions and analyze the forced law of ice-shedding and conductor break. The results showed that the conductor spacing between the upper and lower rows of conductors was lower than the sum of the vibration amplitude of the two rows of conductors, which might lead to contact flashover of the line. After ice-shedding, the tension oscillation of the conductors decreased and the peak value of the oscillation part exceeded the initial state value.The impact load caused by conductor break of a single conductor or was greater than that caused by the conductor break of two conductors.