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Wind Tunnel Test on Aerodynamic Characteristic of Conductor with Thin Ice Accretions

LI Hairuo; GUO Haichao; XIE Qiang

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Electric Power Construction ›› 2013, Vol. 34 ›› Issue (3) : 12-16.

Wind Tunnel Test on Aerodynamic Characteristic of Conductor with Thin Ice Accretions

LI Hairuo1, GUO Haichao2, XIE Qiang1

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Abstract

Galloping of conductor with thin ice accretions is a common but unexplained phenomenon. Wind tunnel tests are needed to study the aerodynamic characteristics of conductors with thin ice accretions. Based on the galloping investigation of real transmission lines with ice, three conductor models with different ice thickness are designed and tested in the wind tunnel. The average aerodynamics of quasi-oval shape iced conductor models in two different flow fields are measured by using six-component high-frequency balance. Through the comparison and analysis of average aerodynamic coefficients, Den Hartog coefficient is found not suitable for the analysis on thin ice wire. On the basis of qualitative explanation of Den Hartog to galloping, two necessary conditions of galloping are proposed. Through the analysis of test results, the wind attack angle has been acquired when the conductor gallops with thin ice accretions.

Key words

thin ice accretions / conductor galloping / wind tunnel test / aerodynamic force / galloping instability

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LI Hairuo, GUO Haichao, XIE Qiang.

Wind Tunnel Test on Aerodynamic Characteristic of Conductor with Thin Ice Accretions

[J]. Electric Power Construction. 2013, 34(3): 12-16

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