Study on AC Resistance of Overhead Conductors by Numerical Simulation

Due to unbalanced energy distribution and economic development, high voltage, long distance power transmission have become one of the major development trends of modern power systems all over the world. The overhead conductors is an important transmission carrier in power system. Reduce line lose and increase transmission capacity of overhead conductors have become the research emphasis. The main affect factor of these overhead conductors performance is AC resistance. However, the AC resistance also affected by many complex factors like skin-effect, magnetic hysteresis and eddy current. The correctly calculated AC resistance of overhead conductors is the key to the energy-saving. In this paper, three kinds of the overhead conductors (Aluminum Conductors Steel Reinforced, Aluminum Conductors Aluminum-Clad Steel Reinforced and Aluminum Conductors Carbon fiber composite core) AC resistance model are built by numerical calculation. By using these model, the AC resistance is simulated calculate. Meanwhile, in order to verify the accuracy of simulation results, the AC resistance of overhead conductors are measured by test. The result show that the different between the simulated values and measured values are less. In addition, through the simulation and measurement results of AC resistance, the energy-saving performance of the three kinds of overhead conductors is also compared. When passing a large current, the AC resistance of Carbon fiber composite core wire is smaller than the other overhead conductors. The calculation can provide reference for the evaluation of AC loss in transmission lines.