A comparison among eight different techniques to achieve an optimum estimation of electrical grounding parameters in two-layered earth

Abstract

This paper intends t o compare t h e performance used t o f i n d t h e e l e c t r i c a l grounding parameters o f a two-layered e a r t h ( r e s i s t i v i t i e s and thickness) evaluated a t p o i n t P o r i n step p. corresponding t o a s p e c i f i c mathematical model. Parameter estimation i s c a r r i e d o u t -i n such a way as t o x -xp get an optimum f i t t i n g between the s e t of r e s i s t i v i t y F(x)

Desenvolvimento de Operador Matemático para Algoritmos de Otimização Heurísticos Aplicado a Problema de Geoprospecção

“…Esta aplicação foi retirada do trabalho de del Alamo [14]. Neste trabalho o autor aplica várias técnicas de otimização em alguns problemas de estratificação.…”

“…Neste trabalho o autor aplica várias técnicas de otimização em alguns problemas de estratificação. Para o caso aqui apresentado, os resultados obtidos em [14] utilizou a First Order Gradient Technique (FOGT), este trabalho considera a estratificação do solo em 2-camadas.…”

Lightning performance assessment of Hellenic high voltage transmission lines

“…The transmission lines are divided into regions due to their different characteristics through their length with special attention to be paid to the monthly meteorological conditions of each geographic region and to the monthly tower footing resistance of each region of the analysed transmission line. The monthly tower footing resistance is easily estimated using either the measured, during construction tower footing resistance or the soil resistivity parameters and the grounding system's geometric characteristics [19][20][21]. The use of the monthly tower footing resistance in the calculations intends in a more accurate assessment of the lightning performance, since the variation of this parameter is significant during the year.…”

A Concurrent Neural Network - Genetic Programming Model for Decision Support Systems

“…This feature also acts as a provider of variable-length expressions. Other techniques (such as Gramatical Evolution (GE) [15] or Linear Genetic Programming (LGP) [5]) employ special genetic operators (which insert or remove chromosome parts) to achieve such a complex functionality.…”