Ice-Shedding Factors of Transmission Line

doi:10.3969/j.issn.1000-7229.2016.04.012

Abstract

Abstract:

Ice shedding, which can cause wire breaking, hardwire failure and flashover, is one of the common disasters for transmission line. In order to study the vibration mechanism of ice shedding, this paper constructs the model of transmission in the finite element software ANSYS, which considers the stiffness of ice and simulates two typical forms of ice-shedding with using the element birth and death method, including the shock-load-induced ice-shedding of a single conductor and one subconductor ice-shedding from bundle conductors. Then, we study the influences of line parameters and external load on the ice shedding through numerical simulation. The results show that：（1） during the shock-load-induced ice shedding, the influences of wind loads should be considered when the span is large；（2） the ice shedding rate and jump height increase with the increase of shock loads；（3） during the one subconductor ice shedding from bundle conductors, the vibration of one subconductor can accelerate the process of ice shedding of the whole span, so the wind loads should be considered；（4） the number and distribution of subconductors have influences on ice-shedding rate；（5） arranging a spacer near the middle of the span will reduce the jump height；（6） the simulation results will not be safe without considering the stiffness of ice. The research results can provide reference for the design of transmission lines.

Key words: ice shedding, stiffness of ice, ice shedding rate, jump height

CLC Number:

TM 726

LI Jiaxiang， LI Hongnan，FU Xing. Ice-Shedding Factors of Transmission Line[J]. Electric Power Construction, 2016, 37(4): 76-83.

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