Electromagnetic analysis of horizontal wire in two-layered soil

Simulation of grounding systems at high frequencies is of interest in electromagnetic compatibility, especially related to lightning, and in emerging technologies, such as power line telecommunications. This paper presents first results in the effort to extend the electromagnetic field theory based modeling of grounding systems to a two-layer model of earth. A rigorous mathematical model which solution involves numerical solution of Sommerfeld-type integrals is described. Also new more approximate but computationally more efficient solution based on quasi-static image theory is introduced. Comparison between these two solutions led to conclusion related to the applicability of the image theory approach, which may be of interest for practical problems.

[1]  Juan R. Mosig,et al.  A Dynamical Radiation Model for Microstrip Structures , 1982 .

[2]  K. Michalski,et al.  Electromagnetic scattering and radiation by surfaces of arbitrary shape in layered media. I. Theory , 1990 .

[3]  M. I. Aksun,et al.  Closed-form Green's functions for general sources and stratified media , 1995 .

[4]  Robert G. Olsen,et al.  A comparison of exact and quasi-static methods for evaluating grounding systems at high frequencies , 1996 .

[5]  Roger F. Harrington,et al.  Field computation by moment methods , 1968 .

[6]  Leonid Grcev,et al.  An electromagnetic model for transients in grounding systems , 1990 .

[7]  M. Ianoz,et al.  EMC Analysis Methods and Computational Models , 1996 .

[8]  J. Nahman,et al.  Digital calculation of earthing systems in nonuniform soil , 1980 .

[9]  F. N. Frenkiel,et al.  Waves In Layered Media , 1960 .

[10]  E. Sunde.  Earth conduction effects in transmission systems , 1949 .

[11]  T. Takashima,et al.  High Frequency Characteristics of Impedances to Ground And Field Distributions of Ground Electrodes , 1981, IEEE Transactions on Power Apparatus and Systems.

[12]  A. Baños.  Dipole radiation in the presence of a conducting half-space , 1966 .

[13]  G. Burke,et al.  Modeling antennas near to and penetrating a lossy interface , 1984 .

[14]  L. Grcev.  Computation of transient voltages near complex caused by ligntning currents , 1992, International Symposium on Electromagnetic Compatibility.

[15]  J. Alamo.  A comparison among eight different techniques to achieve an optimum estimation of electrical grounding parameters in two-layered earth , 1993 .

[16]  Leonid Grcev,et al.  Computer analysis of transient voltages in large grounding systems , 1996 .