Analysis on the Phase Frequency Characteristic of Soil Impedance
- 1 School of Electrical Engineering, Southwest Jiao Tong University, Chengdu, China
- 2 School of Electrical Engineering, Southwest Jiao Tong University, Chengdu, China
- 3 School of Electrical Engineering, Southwest Jiao Tong University, Chengdu, China
Abstract
Soil is a typical porous media and its impedance characteristic directly determines the performance of grounding system. Soil phase frequency characteristic measurements were carried out on various soil types and water content. This paper finds that the impedance angle of soil specimen presents a capacitive performance when power frequency (f) is low. As the frequency increases, soil impedance angle goes up rapidly. Furthermore the frequency characteristic while f > 1000 Hz is distinct in terms of different water content. In particular, at low moisture content, soil impedance angle would be higher than 0?, that is, the inductive component is obvious. The study result indicates that porous media possesses the unique conductivity property dif-ferent from conductor and solution. Its mechanism needs further study.
- Xing, P., Lu, H., Tong, X., et al. (2016) Research on Influence of Soil Characteristic on Impulse Grounding Resistance of Substation Grounding Grid. Engineering Journal of Wuhan University, 49, 223-228.
- Wang, P., Wang, H. and Zhang, J. (2014) Design and Application of Supercapacitor Energy Storage System Used in Low Voltage Ride through of Wind Power Generation System. Proceedings of the CSEE, No. 10, 1528-1537.
- Zhao, W., Zhu, H. and Chen, Y. (2011) Research on the Movement Law of Positive Ions and Electrons in the Plasma Channel of EDM. IEEE.
- Cao, X., Wu, G., Fu, L., et al. (2007) Study of the Temperature Impact on Soil Resistivity. Transactions of China Electrotechnical Society, 22, 1-6.
- Yuan, R. (2011) Study on Fluid Flow Passing through a Porous Media. Acta Analysis Functionalis Applicata, 13, 357-365.
- Choi, J.H. and Lee, B.H. (2012) An Analysis on the Frequency-Dependent Grounding Impedance Based on the Ground Current Dissipation of Counterpoises in the Two-Layered Soils. Journal of Electrostatics, 70, 184-191. https://doi.org/10.1016/j.elstat.2011.12.003
- Zhu, B. (2015) Study on the Variation Characteristic of Soil Electrical Parameters and the Influence on Grounding Device’s Performance. Chongqing University, Chongqing.
- Sima, W., Tang, Y., Yuan, T., et al. (2015) Influence of Soil Dielectric Constant’s Fre-quency-Dependent Characteristic on Impact Current Dispersal of Grounding Electrode. High Voltage Engineering, 41, 1512-1518.
- Visacro, S., Alipio, R., Murta Vale, M.H., et al. (2011) The Response of Grounding Electrodes to Lightning Currents: The Effect of Frequency-Dependent Soil Resistivity and Permittivity. IEEE Transactions on Electromagnetic Compatibility, 53, 401-406. https://doi.org/10.1109/TEMC.2011.2106790