3-DOF overhead line mechanical dynamic model

The paper deals with overhead line motion problems. The line model is based on dynamic description of catenary curve. Benefits of dynamic modeling in this field are decrypted and one of the used models is consequently explained. The dynamic model is derived from string equation. The main contribution of the developed model is complex mechanics simulation in 3D. The model of overhead line shaking is generally based on the superposition of harmonic components in particular spatial coordinates. Each individual harmonic component is solved separately in one step of calculation and than combined with other solutions. The results consist of a continuous description of the position of the wire along its length in both space and time domains. The model thus allows calculations of un-even effects of forces along overhead line length. The accuracy of the calculation is determined by the number of harmonics calculated and other parameters (e.g. step size, simulation time etc.). The model is actually a combination of discrete and continuous calculations. Each model function block is described in equation form. In the case study ACSR 350/59 wire is analyzed. In this part an auxiliary model of wind influence was integrated into the global model.