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Expressions for the wave impedance of traveling wave current on a single wire power line for frequencies in the 100 Hz-l MHz range are derived. The wave impedance (Zz) is defined as the ratio of the vertical electric and the horizontal magnetic fields. A simple expression for Zzis given which is accurate to within 10%. A favorable comparison is made with experimental results. It is shown that Zzis usually significantly larger than the free space wave impedance (120π). However, for measurements in the AM broadcast band, 10-20 meters from the wire, 120πis a fair approximation to the wave impedance.
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Olsen et al. (1985) studied this question.
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