Analytical integration techniques for earthing grid computation by boundary element methods
Ver/Abrir
Use este enlace para citar
http://hdl.handle.net/2183/341Colecciones
Metadatos
Mostrar el registro completo del ítemTítulo
Analytical integration techniques for earthing grid computation by boundary element methodsFecha
1992Cita bibliográfica
Métodos numéricos en ingeniería y ciencias aplicadas : actas del Congreso Internacional sobre Métodos Numéricos en Ingeniería y Ciencias Aplicadas celebrado en la Universidad de Concepción, Chile, del 16 al 20 de noviembre de 1992 = Numerical methods in engineering and applied sciences : proceedings of the International Congress on Numerical Methods in Engineering and Applied Sciences, held at University of Concepción, Chile, 16-20 November 1992, H. Alder ... et al.(eds.), p. 1197-1206
Resumen
[Abstract] Analysis and design of substation earthing involves computing the equivalent resistance of grounding systems, but also distribution of potentials on the earth surface due to fault currents [1]. While very crude approximations were
available in the sixties, several methods have been proposed in the last two
decades, must of them on the basis of intuitive ideas such as superposition of
punctual current sources and error averaging [2,3]. Although these techniques
represented a significant improvement in the area of earthing analysis, a number
of problems have been reported. Namely: large computational requirements, unrealistic results when segmentation of conductors is increased, and uncertainty
in the margin of error [3].
In this paper, a 1D Boundary Element formulation is presented. Several
widespread intuitive methods (such as APM) are identified as particular cases
of this general approach. Thus, former intuitive ideas can now be explained
as suitable assumptions introduced in the BEM formulation to reduce computational cost. The anomalous asymptotic behaviour of this kind of methods is
mathematically explained, and sources of error are pointed out. While linear
and parabolic leakage current elements allow to increase accuracy, computing
time is drastically reduced by means of new analytical integration techniques.
Finally, an application example to a real problem is presented.
ISBN
84-87867-16-2