QuickField Analysis of a Three-Phase Encapsulated Busbars System
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
In this paper, we propose an approach for the magnetic and thermal analysis of a three-phase encapsulated busbars system for high currents using QuickField software. This paper proposes a numerical model developed by coupling of the magnetic field problem with the stationary heat field problem for the geometry of a single-phase execution busbars system. The coupling of problems is realized by importing specific losses from the magnetic field problem as heat sources for thermal field problem. The magnetic field problem is also coupled to the electrical circuit. The shields are short-circuited at both ends and they are connected to the ground. For this constructive solution, in the shields occur induced currents, approximately equals to those of conductors. The analyzed constructive solution has two conductors in parallel per phase, by technological reasons, and therefore electrodynamic forces appear between them. Due to the shielding effect, the magnetic field is practically zero outside of shield and therefore the forces do not occur between phases. In the model it was taken into account the variation of electrical conductivity with the temperature. The thermal model has been validated by an analytical procedure for calculating the active conductor and shield temperatures. The global coefficient of heat transfer by convection and radiation used in thermal model was estimated using the power losses computed by magnetic model. There is a good agreement between analytically calculated temperatures and those numerically calculated. The presented model can be used for analysis, design and optimization of three-phase busbars systems in single phase execution.
Authors and Affiliations
Ioan Popa, Marian Ciontu, Alin-Iulian Dolan
Keywords
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