A Refined Mathematical Model of Physical Processes in a Conductor at a High-Current Pulse Discharge

Authors

  • Yevgen Bajda National Technical University “Kharkiv Polytechnic Institute”, Ukraine
  • Michael Pantelyat National Technical University “Kharkiv Polytechnic Institute”, Ukraine

DOI:

https://doi.org/10.33042/2079-424X.2021.60.3.05

Keywords:

Multiphysics Processes, Thermal Strength, Short-Term Electrical Discharge, Mathematical Model

Abstract

A novel mathematical model describing physical processes during the flow of an aperiodic pulse current with amplitude of 100 kA along a conductor with a circular cross-section is proposed and investigated. It is shown how a short-term electric discharge of an aperiodic shape affects the distribution of the current density in the cross-section of the conductor, causing its nonuniform heating and the appearance of significant thermal forces as well as mechanical stresses and strains. Based on the developed mathematical model, the relationship between electromagnetic, thermal and mechanical phenomena is shown, allowing a deeper understanding of the multiphysics processes taking place. The maximum values of the current density are calculated, which on the surface of the conductor reach values of 47 kA/mm2, while the temperature rise of a copper conductor with a diameter of 2.44 mm is no more than 80ºC at high temperature gradients, which causes the appearance of thermal stresses that have value (40–50)% of the value of the short-term strength limit of electrical copper. Utilization of this model allows to more accurately determine the required conductor cross-section based on the characteristics of electromagnetic, thermal and mechanical processes. It is shown that the simplified model (the condition for the uniform distribution of the current over the cross-section) gives significantly underestimated values of temperatures and does not take into account temperature deformations.

Author Biographies

Yevgen Bajda, National Technical University “Kharkiv Polytechnic Institute”, Ukraine

D.Sc., Associate Professor of the Department of Electrical Apparatus

Michael Pantelyat, National Technical University “Kharkiv Polytechnic Institute”, Ukraine

Ph.D., Associate Professor of the Department of Electrical Apparatus

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Published

2021-12-30

How to Cite

Bajda, Y., & Pantelyat, M. (2021). A Refined Mathematical Model of Physical Processes in a Conductor at a High-Current Pulse Discharge. Lighting Engineering & Power Engineering, 60(3), 124–132. https://doi.org/10.33042/2079-424X.2021.60.3.05

Issue

Vol. 60 No. 3 (2021): Lighting Engineering & Power Engineering

Section

Articles

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