Modeling of current distribution in zinc oxide varistors using Voronoi network and finite element method

Topcagic, Zumret; Tsovilis, Thomas E.; Križaj, Dejan

doi:10.1016/j.epsr.2018.08.001

Cited by 24 publications

(21 citation statements)

References 20 publications

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“…In order to reflect this microstructure in simulation, a 2D Voronoi network as Figure 2 shows is generated by using the code of [14] as the geometric model of MOV microstructure in Wolfram Mathematic. The Voronoi network has the same height as the MOV sample, but to save computing resources, its length is only 15 mm.…”

Section: Numerical Model Of Mov Microstructurementioning

confidence: 99%

“…Different from [14,16], taking the average grain number in the vertical direction of the model as N, the series coefficient defined in this paper, that is, the number of equivalent grain boundaries will change with voltage. Through iterative calculation, the corresponding relationship between voltage and N as Figure 4 shows can be obtained.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Topcagic et al. gave the V – I characteristics of real MOV samples to the Voronoi network in the form of grain boundary contact resistivity, and solved the current distribution of MOV under different voltages by the finite element method [14, 15]. On the basis of [14], Zhou et al.…”

Section: Introductionmentioning

confidence: 99%

“…gave the V – I characteristics of real MOV samples to the Voronoi network in the form of grain boundary contact resistivity, and solved the current distribution of MOV under different voltages by the finite element method [14, 15]. On the basis of [14], Zhou et al. used the finite element method to solve the temperature distribution and the response under impulse current of MOV [16].…”

Section: Introductionmentioning

confidence: 99%

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Research on electrothermal characteristics of metal oxide varistor based on multi‐physical fields

Zhou

Huang

Cao

et al. 2022

IET Generation Trans & Dist

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The electrothermal characteristics of metal oxide varistor (MOV), closely related to its microstructure, are important for studying its failure mechanism. This paper proposes an improved MOV microstructure model based on the Voronoi network for simulating the electrothermal behaviour of MOV. With the proposed model, not only the simulation accuracy under constant electrical stress can be improved, but also the simulation of MOV under time-dependent electrical stress (a.c. or impulse) can be realized. The simulation results are in good agreement with the experimental data. In addition, according to the electrothermal characteristics of MOV microstructure and the failure phenomenon of MOV in the experiments, the failure mechanism of MOV under different electrical stresses is analysed and discussed. It is found that the serious local heating caused by current concentration and thermal stress caused by huge temperature gradient are the main reasons for the MOV failure. This paper provides an effective method for the study of MOV electrothermal characteristics and theoretical reference for the performance improvement of MOV.

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Section: Numerical Model Of Mov Microstructurementioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on electrothermal characteristics of metal oxide varistor based on multi‐physical fields

Zhou

Huang

Cao

et al. 2022

IET Generation Trans & Dist

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“…Meanwhile, in the breakdown regime, the current density in a ZnO varistor is inhomogeneous [24]. The current in this operating region forms channels and paths through the ceramics and does not flow homogeneously [25]. Besides, inhomogeneous current leads to uneven heat generation, resulting in inhomogeneous thermal expansion in the MOSAs, which is the main reason for cracking failure [26].…”

Section: Introductionmentioning

confidence: 99%

Thermal FEM Analysis of Surge Arresters During HVdc Current Interruption Validated by Experiments

Liu

Popov

Belda

et al. 2022

IEEE Trans. Power Delivery

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This paper deals with the development of an accurate finite-element model of an arrester to investigate the electrothermal and mechanical stress during dc current interruption. The comprehensive analysis performed on a ZnO surge arrester is supported by experiments during high-voltage dc circuit breaker current interruption. The performed experimental analysis comprises three sequential 26 kV/10 kA direct current interruption tests carried out within a period of one hour. The dynamic temperature and current distribution of the surge arrester columns during current interruption are measured. The finite-element simulation results are in good agreement with the test results. The influence of the surge arrester temperature on the current distribution among the surge arrester columns is analyzed. The impact of the surge arrester temperature on ZnO electrical characteristics and mechanical stress inside the surge arrester are also investigated. The surge arrester finite-element model can be used with full success for parameter optimization of the surge arresters to prevent possible failures when dc circuit breakers performed multiple interruptions in short period of time.

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ZnOVaristors: From Grain Boundaries to Power Applications

Greuter

2021

Oxide Electronics

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Modeling of current distribution in zinc oxide varistors using Voronoi network and finite element method

Cited by 24 publications

References 20 publications

Research on electrothermal characteristics of metal oxide varistor based on multi‐physical fields

Research on electrothermal characteristics of metal oxide varistor based on multi‐physical fields

Thermal FEM Analysis of Surge Arresters During HVdc Current Interruption Validated by Experiments

ZnOVaristors: From Grain Boundaries to Power Applications

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