A modelling approach to describe the DC current-voltage behaviour of low-voltage zinc oxide varistors

Kaufmann, B.; Billovits, Thomas; Kratzer, Markus; Teichert, Christian; Supancic, Peter

doi:10.1016/j.oceram.2021.100113

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…Nevertheless, the models proposed in these studies, some developed for finite element method simulations [18], [23], are difficult to be implemented in electromagnetic transient simulation programs as they are complicated to adapt or/and require physical parameters that cannot be easily experimentally derived and are not provided by manufacturers [21], [23], [26]. In light of the above, the transient response and energy handling capability of varistors under AC and DC temporary overvoltages (TOV), and impulse currents, although studied for the last 30 years [36], [37], still attract the interest of the scientific and engineering community [1], [2], [38]- [41].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Methodology for Modeling the Voltage-Dependent Capacitance and Resistance of Varistors: Implications on the Estimation of the Power and Energy Dissipation at Low Frequencies

Staikos,

Tsovilis

2023

IEEE Trans. Power Delivery

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In this work, a mathematical formulation is presented for estimating current conduction as well as power and energy dissipation in varistors. An experimental approach is introduced for time-domain modeling of varistors under AC voltages that considers their voltage-dependent capacitance and resistance. An application is made for 120 V zinc-oxide varistors stressed with AC voltages generated by a variable-frequency highpower supply; the voltage at the varistors' terminals is recorded along with the current for a low-frequency (60 Hz -1000 Hz) and amplitude (50 μA -1 A) range. The predicted current conduction through ATP-EMTP simulations is in very good agreement with experimental records, in contrast to the simplified (constantcapacitance) modeling approach that underestimates power and energy dissipation. The effectiveness of the proposed macroscopic modeling approach in the low-frequency range is investigated with emphasis given to 400 Hz, commonly employed in aviation systems; the applicability of the proposed model in the high frequency and current range has been evaluated and discussed with the aid of impulse voltage and current experiments.

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Section: Introductionmentioning

confidence: 99%

An Experimental Methodology for Modeling the Voltage-Dependent Capacitance and Resistance of Varistors: Implications on the Estimation of the Power and Energy Dissipation at Low Frequencies

Staikos,

Tsovilis

2023

IEEE Trans. Power Delivery

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“…Most of the available blocks were stable under AC but not necessarily stable under a DC stress. For low-voltage ZnO varistors, simulations are developing to describe the DC current-voltage (I-V) behavior and to obtain extended DC I-V characteristics in the time domain [2,3].…”

Section: Introductionmentioning

confidence: 99%

DC Aging Mechanism of Co2O3-Doped ZnO Varistors

et al. 2021

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Lowered power loss and asymmetrically electrical parameters are reported in the DC aging of Co2O3-doped ZnO varistors in this paper. Based on the frequency domain dielectric responses of the pristine and degraded samples, the present study explores the roles of point defects in the aging process via dielectric relaxations and their parameters. It is found that breakdown field increased more in the positive direction than the negative direction. Nonlinearity increased in the positive direction, whereas it decreased in the negative direction, and leakage current density increased more in the negative direction than the positive direction. Given the lowest migration energy of Zinc interstitial (Zni, 0.57 eV) and high oxygen ion conductivity in Bi2O3-rich phase, it is speculated that Zni and adsorbed oxygen (Oad) migrate under DC bias, and then change the defect structure and the double Schottky barrier (DSB) at grain boundaries. As a result, the forward-biased barrier height gradually decreases more than the reverse-biased one.

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The Influence Mechanism that Micro Grain-Boundary Structure Parameters of ZnO Varistor to the Macroscopic Electrical Characteristics

Meng,

Guo,

Lei

et al. 2024

Lecture Notes in Electrical Engineering

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A modelling approach to describe the DC current-voltage behaviour of low-voltage zinc oxide varistors

Cited by 6 publications

References 40 publications

An Experimental Methodology for Modeling the Voltage-Dependent Capacitance and Resistance of Varistors: Implications on the Estimation of the Power and Energy Dissipation at Low Frequencies

An Experimental Methodology for Modeling the Voltage-Dependent Capacitance and Resistance of Varistors: Implications on the Estimation of the Power and Energy Dissipation at Low Frequencies

DC Aging Mechanism of Co2O3-Doped ZnO Varistors

The Influence Mechanism that Micro Grain-Boundary Structure Parameters of ZnO Varistor to the Macroscopic Electrical Characteristics

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