Estimation of Multilayer Soil Parameters Using Genetic Algorithms

Abstract

In this paper, a methodology has been proposed according to which, after carrying out a set of soil's resistivity measurements, one can compute the parameters of the multilayer earth structure using a genetic algorithm (GA). The results provided by the GA constitute the indispensable data that can be used in circuital or field simulations of grounding systems. The methodology, developed on the base of the PC Opera software package, allows to proceed toward a very efficient simulation of the grounding system and an accurate calculation of potential on the ground's surface.

Validation of the Calculation and Measurement Techniques of Earth Resistance Values

“…Table 1 shows the measured apparent soil resistivity values obtained for all these three sites. The soil resistivity values obtained from these measurements are then interpreted into two-layer soil using the master curves [7] and Genetic Algorithm (GA) [3] .…”

“…Much research [3,7] has conducted the study on the interpretation of two distinct soil resistivity layers. IEEE Std 81-1983 [9] also stated that for applications in power engineering, the two-layer equivalent model is accurate enough without being mathematically too involved.…”

“…IEEE Std 81-1983 [9] also stated that for applications in power engineering, the two-layer equivalent model is accurate enough without being mathematically too involved. Thus, in this present study, the soil resistivity data is interpreted into two layers of soil, using the master resistivity curves [7] and Genetic Algorithm (GA) [3] . For the purpose of a better understanding on the soil interpretation methods, some details are included in the respective research.…”

“…The method and formulas adopted in this present study is taken from the remarkable work by Gonos and Stathopulos [3] . In this method, the calculation of the parameters of a two-layer structure of the earth is an optimization problem.…”

Grounding Grid Performance of Substation in Two Layer Soil - A Parametric Analysis

“…Dawalibi et.al compared the measured and calculated values of current densities of grounding grid [7], [1]. Analysis of surface potential and current densities in multilayer soil is available in the literature [8,9,10].In this paper, grounding grid performance indices such as Ground resistance( Rg), Mesh voltage (Em), Step voltage(Es), Ground potential rise(GPR) are carried out for various types of grid configurations in two layer soil structure for both positive and negative refection factor K. where = 2 − 1 2 + 1 ----Reflection factor.…”