The Research On Aerodynamic Characteristics Of Iced Bundle Conductors Galloping

Rain and snow weather in the winter, surface of transmission line will be covered by ice.Therefore, its cross section becomes non-circular. The air force will be generated on thetransmission line when the wind blows. At this time, conductors will galloping. Since thecharacteristics of the galloping are low frequency and large amplitude, so it may cause seriousharm to the power facilities and electrical systems. In order to prevent electricity accidentscaused by iced conductors galloping, it is significant to research the aerodynamiccharacteristics of iced conductors suffered wind loads and the features of iced conductorsgalloping.Firstly, used GAMBIT software to establish a two-dimensional crescent quad-bundle icedconductors’ finite element model. The finite element model was imported into FLUENTsoftware and calculated aerodynamic coefficients of the quad-bundle iced conductors indifferent conductor spacing and ice thickness. The results showed that the two factors have asignificant influence on wake flow. The situation that downwind sub-conductor affected byupwind sub-conductor is always different with the conductor spacing and ice thicknesschanges. Used method of least squares fit the aerodynamic coefficients to calculate thecoefficients of Den Hartog. As criterion, the stability of the quad-bundle iced conductors wasanalyzed.Lastly, the finite element model of quad-bundle iced conductors was established inANSYS, the aerodynamic coefficients calculated was loaded into conductors as the load andcalculate galloping amplitudes of the quad-bundle iced conductors in different conductorspacing and ice thickness. The results showed that each sub-conductor have the sameamplitude, but the size of the amplitude significantly affected by these two factors.