Title :
Accurate representation of soil behaviour for transient studies
Author :
Portela, C. Medeiros ; Tavares, M. Cristina ; Filho, J. Pissolato
Author_Institution :
COPPE-Fed. Univ. of Rio de Janeiro, Brazil
Abstract :
A paper representation of soil behaviour for transient studies is presented. Such representation is more accurate than the most common procedures of engineering practice and, in several conditions, lead to results with important differences. The proposed model takes into account the earth´s conductivity and permittivity frequency dependence, which normally are not considered. One of the aspects covered in the paper is the importance of properly considering the Earth´s electromagnetic behaviour when calculating transmission line parameters. Some comparisons are presented for an actual 440 kV three-phase transmission line in which the soil behaviour is represented through a unique real value of conductance (the normal approach) and through the proposed model.
Keywords :
electrical conductivity; permittivity; power overhead lines; soil; transient analysis; 440 kV; Earth´s conductivity; conductance; electromagnetic behaviour; engineering practice; permittivity frequency dependence; soil behaviour; transient studies; transmission line parameters;
Journal_Title :
Generation, Transmission and Distribution, IEE Proceedings-
DOI :
10.1049/ip-gtd:20030879