Why do computer methods for grounding analysis produce anomalous results?
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Why do computer methods for grounding analysis produce anomalous results?Data
2003Resumo
[Abstract] Grounding systems are designed to guarantee personal security, protection of equipments and continuity of power
supply. Hence, engineers must compute the equivalent resistance of the system and the potential distribution on the earth surface
when a fault condition occurs [1], [2], [3]. While very crude
approximations were available until the 70’s, several computer
methods have been more recently proposed on the basis of
practice, semi-empirical works and intuitive ideas such as superposition
of punctual current sources and error averaging [1], [3],
[4], [5], [6]. Although these techniques are widely used, several
problems have been reported. Namely: large computational requirements,
unrealistic results when segmentation of conductors
is increased, and uncertainty in the margin of error [2], [5].
A Boundary Element formulation for grounding analysis is
presented in this paper. Existing computer methods such as
APM are identified as particular cases within this theoretical
framework. While linear and quadratic leakage current elements
allow to increase accuracy, computing time is reduced by means
of new analytical integration techniques. Former intuitive ideas
can now be explained as suitable assumptions introduced in
the BEM formulation to reduce computational cost. Thus, the
anomalous asymptotic behaviour of this kind of methods is
mathematically explained, and sources of error are rigorously
identified.
Palabras chave
Anomalous results
Average potential method
Boundary element method
Boundary integral equations
Computer methods for grounding analysis
Convergence of numerical methods
Fault currents
Grounding
Power system protection
Average potential method
Boundary element method
Boundary integral equations
Computer methods for grounding analysis
Convergence of numerical methods
Fault currents
Grounding
Power system protection
Descrición
Aceptado en "IEEE transactions on power delivery"
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ISSN
0885-8977
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