Abstract
High frequency wave propagation on overhead conductors has been evaluated by TL (transmission line) approach. The results are compared with those calculated by the numerical electromagnetic code (NEC) in the frequency domain. Both results show transition of wave propagation between TEM (transverse electromagnetic) and TM (transverse magnetic) modes in the frequency region fc<f<fs where fc is the critical frequency at which the transition starts and fs is the frequency above which a surface wave is completed. In the frequency region higher than the frequency fs, the earth-return impedance has minor contribution to the wave propagation, because it is no more an earth-return wave but a surface wave. This has been also investigated in the time domain based on simulation results by FDTD (finite-difference time-domain) method to confirm the results by the TL approach.
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