Research on Icing Torsion Suppression Method of Overhead Single Conductors Based on Dynamic Balance of Orthogonal Moments

Abstract

Icing torsion of overhead single conductors exacerbates conductors icing, posing a serious threat to the power grid's operation. Few methods exist to suppress icing torsion and reduce the risk of icing damage to the power grid. This paper observes and analyzes the icing torsion of single conductor in the field natural environment, establishing the mathematical-physical model for icing torsion of overhead single conductors. A novel approach involving the application of orthogonal moments to the conductor is proposed to enhance its equivalent torsional stiffness and then suppress icing torsion. The effectiveness of this suppression method is quantified by the effective suppression interval ratio, the maximum suppression rate of icing torsion angle, and the icing torsion angle decrease ratio. Taking the LGJ-400/35 overhead single conductor as object, the field natural experiments on suppressing its icing torsion were conducted. The results demonstrate that the method proposed significantly suppresses the icing torsion of overhead single conductor, with an effective suppression interval ratio of 100%, a maximum suppression rate of icing torsion angle exceeding 90%, and the icing torsion angle decrease ratio surpassing 88%.