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The ampacity of underground power cable lines is limited by the maximal allowable temperature of the conductor. Normally the IEC 60287 standard is used for steady state ampacity calculation. The standard employs the concept of thermal equivalent circuit. An alternative to the standard is the finite element (FEA) simulation of electromagnetic and thermal field around cables. This paper presents a systematic...
This paper presents an alternative methodology for the grounding resistance calculation of vertical electrode arrays through a computational algorithm. This algorithm was developed based on the fundamental equations for the self and mutual resistance between grounding rods calculation being it's result confronted with the a model based on the finite element method (FEM) and the formulas found in the...
A finite-element mode for the grounding system and soil is built in the software of ANSYS 10.0 to study the performance of grounding systems when considering the soil ionization phenomenon around the grounding system under different soil structures. The calculated results are validated by the simulation results found in the published papers. The performance of the grounding systems when considering...
In this paper, a new program solution is presented to analyze the electromagnetic field around the grounding grid. In contrast to recently existent procedure based on the “classical” finite element method (FEM), in this new methodology the soil and the air domain of the problem are discretized by the 3-D finite elements and the conductors of the grounding grid are discretized by 1-D finite line elements...
Based on finite-element method of 1-dimensional conductor element coupled with 3-dimensional soil element, a coordinate transformation is carried out. The irregular hexahedron domain of element is mapped onto a cube domain. Considering the frequency dependent characteristic of the discretized elements, the grounding performance of the substation grounding grids in multilayer earth is analyzed, and...
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