Title :
A review of methods for grounding grid analysis
Author :
Petar Sarajcev;Slavko Vujevic
Author_Institution :
University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Rudjera Boskovica bb, HR-21000, Croatia
Abstract :
This paper presents a brief review of the most important methods available for the grounding grid analysis. This includes numerical methods intended for the grounding grid direct current, time-harmonic current and transient current energization. Emphasis will be given to the methods involving transient grounding grid analysis. Available numerical methods will be surveyed according to the implemented soil model, e.g. homogenous soil, horizontally and vertically stratified multilayer soil as well as exceptionally heterogeneous soil. In that regard, various possible treatments of the boundary between soil layers are discussed. Here, image methods feature prominently in a solution to this problem. Whence, several possible image methods are reviewed. Additionally, numerical methods are surveyed according to the theoretical background approach. Here, one can make a clear distinction between circuit approach, transmission line approach, electromagnetic theory approach and hybrid approach. Numerical methods for the transient analysis of grounding grids are also reviewed in regards to the domain of the solution. Therefore, they could be regarded as frequency domain and time domain methods. Fast Fourier transform algorithm is seen as a conventional way of crossing between frequency and time domains. Major advantages and disadvantages of both approaches are pointed out as well.
Keywords :
"Grounding","Soil","Transient analysis","Geometry","Power system transients","Nonhomogeneous media","Finite element methods","Mechanical engineering","Circuits","Power transmission lines"
Conference_Titel :
Software, Telecommunications & Computer Networks, 2009. SoftCOM 2009. 17th International Conference on
Print_ISBN :
978-1-4244-4973-6