| Title |
A Method of Computing the Frequency-Dependent Ground Impedance of Horizontally-buried Wires |
| Authors |
조성철(Cho, Sung-Chul) ; 이복희(Lee, Bok-Hee) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.5.745 |
| Keywords |
Grounding system ; Frequency-dependent ground impedance ; Dielectric polarization ; Debye's equation ; Delta-gap source |
| Abstract |
The parameters of Debye's equation were applied to analyze the frequency-dependent ground impedance of horizontally-buried wires. We present a new method, based on Debye's equation, of analyzing the effect of polarization on frequency-dependent ground impedance. The frequency-dependent ground impedances of a horizontally-buried wire are directly measured and calculated by applying sinusoidal current in the frequency range of 100 Hz to 10 MHz. Also, the results obtained in this work were compared with the data calculated from empirical equations and commercial programs. A new methodology using the delta-gap source model is proposed in order to calculate frequency-dependent ground impedance when the ground current is injected at the middle-point of the horizontal ground electrode. The high frequency ground impedance of horizontal electrodes longer than 30 m is larger or equal to its low frequency ground resistance. Consequently, the frequency-dependent ground impedance simulated with the proposed method is in agreement with the experimental data, and the validity of the computational simulation approach is confirmed. |