1990分裂导线分析与试验.pdf

1910 IEEE Transactions on Power Delivery, Vol. 5 , No. 4, November 1990 OSCILLATION OF BUNDLE CONDUCTORS INOVERHEADLINES DUE TO TURBULENT WIND G.Diana*, Member, IEEE P.NicoliniO,F.Tavanoo F.Cheli*, A.Manenti** *Politecnicodi Milano, Milano, Italia **Universita degli Studi diBrescia, Brescia, Italia ENEYCREl ,Milano, Italia Abstract - Due to the wind, the bundle conductors in overhead FORMULATION OF THE PROBLEM lines can oscillate and the distance between the phases can be. reduced. This kind of movement may be caused by: The aerodynamic forces and moments created by the wind - non expansive oscillations of the phases due to the wind turbulence depend on the wind speed, on the bundle configuration and on the and to the correlated variations of the bundles aerodynamic absolute and relative velocities of each conductor ([I], [2], [3]). coefficients during the movement (buffeting); For what concems relative displacements among conductors - expansive oscillations, or galloping, of the phases due to the belonging to the same phase, it should be noted that forces and unstable aerodynamic shapes