Plane Wave Coupling to Overhead Lines Over Stratified Earth

Time-Domain Analysis for the Coupling Problem of Overhead Lines Above Multilayered Earth

“…As observed in Fig. 6, the current FDTD-based method (solid curves) matches very well with the FFT results (dashed curves) reported in [20] for the case of vertical and horizontal polarizations. Note that the slight difference between the FFT and FDTD results is because the earth return impedance models used in this work and in [20] are not the same: this paper uses the Nakagawa model and [20] the Papadopoulos model [21].…”

“…(16) are given by : α = 4 × 10 6 s −1 , β = 4.76 × 10 8 s −1 , and E 0 = 52.5 (kV/m). As observed in Fig.6, the current FDTD-based method (solid curves) matches very well with the FFT results (dashed curves) reported in[20] for the case of vertical and horizontal polarizations. Note that the slight difference between the FFT and FDTD results is because the earth return impedance models…”

“…The value of N equal to 10 is adopted to accurately estimate the primary field for all the parameters involved. To validate the proposed method, the two-conductor transmission line over a two-layer soil introduced in [20] is considered. The line configuration is shown in Fig.…”

“…Due to the small conductivity (σ 1 = 0.0001 S/m) of the first layer, the losses in the soil become greater as d 1 increases, which is reflected in the decrease in voltage at the early time. The same observation can be made concerning the variation of the voltage at the near end of the line as a function of the thickness of the second layer for d 1 = 0.5 m. In addition, in the case of vertical polarization, the depth of the second layer has an effect on the pulse width.To validate the proposed method, the two-conductor transmission line over a two-layer soil introduced in[20] is considered. The line configuration is shown in Fig.5.…”