Dynamics calculation of an overhead transmission line breaking condition based on the absolute nodal coordinate formulation

In order to calculate the dynamic change characteristics of overhead lines under the condition of lines breakage, considering the layout characteristics of the twisted geometry and initial configuration of overhead lines, an overhead line element was established based on the absolute nodal coordinate formulation. The mass matrix and elastic force matrix of the overhead line element were derived, and the System dynamic equation of the overhead line was presented. The formulas for calculating the axial and bending stiffness of the steel core aluminum Strand were provided. The motion image of the cable was obtained through the Simulation calculation, and the reliability of the algorithm model was verified by the design experiment. Based on the actual initial configuration and initial stress characteristics of the overhead line, the dynamics behaviors in overhead line breaking conditions under different initial Stresses were simulated and analyzed. The stress time history curve at the Suspension point was drawn and the spectrum of the curve was analyzed. The influence of initial stress on the motion process of the overhead line breaking and the stress at the Suspension point was studied. © 2024 Chinese Vibration Engineering Society. All rights reserved.