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Simplified Thermal Computation of a Metal Oxide Varistor Element under a Lightning Impulse Current Injection
Author(s) -
Tanaka Tokuya,
Baba Yoshihiro,
Tsujimoto Yoshimasa,
Tsukamoto Naoyuki
Publication year - 2021
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.23375
Subject(s) - varistor , impulse (physics) , thermal conduction , current density , finite element method , materials science , computation , mechanics , electric field , discretization , electrical engineering , physics , engineering , composite material , mathematical analysis , mathematics , voltage , thermodynamics , classical mechanics , quantum mechanics , algorithm
A simple thermal computation procedure of a metal oxide varistor (MOV) element, in which an impulse current is injected, is presented. The heat in the MOV, composed of many small cells, is computed with the discretized heat transport equation. At each time step, the injected impulse current is assumed to be distributed uniformly in the MOV. The power per cell is computed from the instantaneous values of injected conduction current density and resultant electric field, the latter of which is obtained with an approximate expression of the nonlinear relation between conduction current density and electric field. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.