Nonlinear dynamic analysis for a transmission tower-line system subjected to wire breakage

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (7) : 70-79.

LI Yan1,2,LIU Hongjun1,2,LI Zhengliang1,2,GE Xuzhang3#br#

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Abstract

Taking a 500 kV high-voltage transmission line as a study object,a fine finite element model of a transmission tower-line system was established.Considering collision and contact between a dropped wire and ground,nonlinear dynamic analyses of the system with different break points and different numbers of broken wires were performed.The results showed that the break point location has little effects on the impact action of broken wire; the tension decay coefficient of the broken wire decreases with increase in the height of the hanging point position,while that of the unbroken wire decreases first and then increases with increase in the height of the hanging point position; the tension coefficient of a strain tower is much larger than that of the tangent tower; the dynamic amplification coefficient of a strain tower is 1.1-1.5.Finally,the torsional failure mode and bending failure one of a strain tower were studied under the most unfavourable working conditions of multi-wire breakage.

Key words

transmission tower / wire broken / nonlinear dynamic / failure mode / finite element method (FEM)

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LI Yan1,2,LIU Hongjun1,2,LI Zhengliang1,2,GE Xuzhang3. Nonlinear dynamic analysis for a transmission tower-line system subjected to wire breakage[J]. Journal of Vibration and Shock, 2017, 36(7): 70-79

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