유한요소법에 의한 ZnO 바리스터 동작 시 발생되는 열폭주 현상 해석 = Analysis of Thermal Runaway Phenomenon Caused by ZnO Varistor Operation Using Finite Element Method

다국어 초록 (Multilingual Abstract)

Since the ZnO varistor is a semiconductor device, the internal thermal distribution during the varistor operation is recognized as an important factor in the performance and deterioration of the varistor. For an optimal varistor structure design, the thermal runaway phenomenon during the varistor operation was interpreted using the Comsol 5.2 analysis program by a finite element analysis. The maximum temperature of the center measured in the cross section of the ZnO varistor was confirmed to increase as the temperature moved from the lower electrode to the center towards the upper electrode up to 572.6 K. The electrodes are thinned so that the influence of the Schottky barrier is not great. The heat gradient balance is determined to be improved when the electrode of the hybrid form is introduced. The thickness, density, pore distribution, impurity uniformity, and particle size of the ZnO varistor are required, and it is determined that the pyrolysis gradient will be improved regardless of the electrode thickness. When these results are applied to design the ZnO varistor, the optimal structure of the ZnO varistor can be obtained.

참고문헌 (Reference)

1 Benjamin Kaufmann, "Observation of an electrical breakdown at ZnO Schottky contacts in varistors" Elsevier BV 41 (41): 1969-1974, 2021

2 F RETTIG, "Morphology dependence of thermopower and conductance in semiconducting oxides with space charge regions" Elsevier BV 179 (179): 2299-2307, 2008

3 Wolfgang Preis, "Modelling of diffusion and conductivity relaxation of oxide ceramics" Elsevier BV 99 : 43-50, 2016

4 Zumret Topcagic, "Modeling of current distribution in zinc oxide varistors using Voronoi network and finite element method" Elsevier BV 164 : 253-262, 2018

5 Dina H.A. Besisa, "Inspection of thermal stress parameters of high temperature ceramics and energy absorber materials" Elsevier BV 203 : 110160-, 2019

6 Xia Zhao, "Enhancement in the long-term stability of ZnO varistor ceramics against DC aging by controlling intergranular phases" Elsevier BV 894 : 162543-, 2022

7 Zhuyun Li, "Effectively enhanced comprehensive electrical performance of ZnO varistors by a fast combinatorial refinement method" Elsevier BV 133 : 105945-, 2021

8 Vasiliki Vita, "Comparison of ANN and finite element analysis simulation software for the calculation of the electric field around metal oxide surge arresters" Elsevier BV 133 : 87-92, 2016

9 Altsoft, "COMSOL Multiphysics Version 4.0 released" Mark Allen Group 2010 (2010): 4-, 2010