An Experimental Study on the Effect of Multiple Lightning Waveform Parameters on the Aging Characteristics of ZnO Varistors

Zhang, Chunlong; Li, Chunying; Lv, Dongbo; Zhu, Hancheng; Xing, Hongyan

doi:10.3390/electronics9060930

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…The work is related to the work carried out in [10,12,15], showing a decreasing trend in the reference voltages and an increase in leakage currents after applied lightning current impulses. Zhang [17] examined the effect of a multiple lightning waveform on the aging of Zinc Oxide Varistors (ZnO). MOVs were degraded under different numbers of impulses and pulse intervals.…”

Section: Review Of Surge Degradationmentioning

confidence: 99%

“…Therefore, a condition assessment of MOV arresters is essential for the early detection of degradation. Condition assessments may focus on the analysis of electrical properties (V-I characteristics, leakage current, nonlinear coefficient, return voltage measurements, voltage decay, and C-V characteristics) as well as on the physical properties (grain boundaries and grain sizes) before and after specific test conditions [15][16][17][18][19][20]. Since these surge protection devices are quite popular and have proven to be effective in electronic systems, more attention should be directed to the understanding of MOV response to switching surges in order to assess its reliability under the aforementioned conditions.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Low-Voltage Varistors’ Responses under Slow-Front Overvoltages

Muremi

Bokoro

Doorsamy

2023

Electronic Materials

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In this study, commercially low-voltage MOVs are exposed to switching surges to analyse and model the relationship between the number of surges and the MOV grain barrier height response. Repeated slow-front overvoltage transients are used to degrade the protective qualities of metal oxide surge arrester devices, affecting their reliability and stability. A total of 360 MOVs with similar specifications from three different manufacturers are degraded under switching surges at a constant temperature of 60 °C. The reference voltage and C-V characteristics of MOVs are measured before and after the degradation process to analyse the MOVs’ conditions. Grain barrier heights are determined from the C-V characteristics curve. An F-statistical analysis is then applied to analyse the effects of number of surges on the grain barrier height. The T-test is used to assess the statistical difference between the tested groups. Linear regression analysis is then applied to model the relationship between the number of surges and MOV grain barrier height. The results obtained show that the number of surges has a significant impact on grain barrier height. MOV grain barrier height is found to decrease as the number of surges applied increases. Regression models obtained for the tested MOV groups across all three manufacturers agree and indicate that the reduction in grain barrier height results from an increased number of surges. Regression coefficients of a developed model indicate that for one surge applied, the MOV grain barrier height decreases by 0.024, 0.055, and 0.033 eV/cm for manufacturers X, Y, and Z, respectively. Therefore, there is a linear relationship between grain barrier height and the number of applied switching surges.

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Section: Review Of Surge Degradationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of Low-Voltage Varistors’ Responses under Slow-Front Overvoltages

Muremi

Bokoro

Doorsamy

2023

Electronic Materials

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“…In references [9,10], thermal effects on surge arresters under lightning strikes were simulated using finite element methods. In reference [11], multiple pulse impact experiments on varistors were conducted, and the variation patterns of their electrical parameters were summarized, revealing a significant decline in their withstand characteristics after reaching the threshold. Reference [12] supplemented the study of the double Schottky barrier attenuation phenomenon in varistors and explained the influence of defect structures caused by manufacturing processes on the deterioration mechanism.…”

Section: Introductionmentioning

confidence: 99%

Research on the Prediction Method of MOV Deterioration State Based on Principal Component Analysis and Grid Search- Optimized Support Vector Machine Regression Algorithm

Zhu,

Xu,

Xiao

et al. 2024

Preprint

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Background: Accurate diagnosis of faults in metal oxide varistors (MOV) is crucial for the safe operation of power systems, and the deterioration of MOV under continuous pulse impacts can be more severe. To effectively improve the fault diagnosis rate, this paper proposes a fault diagnosis algorithm based on Principal Component Analysis (PCA) and Grid Search-optimized Support Vector Regression (GS-SVR).Objective, The objective of this study is to propose an effective fault diagnosis algorithm that accurately predicts the fault state of MOV under single and continuous pulse impacts, while reducing the correlation between indication indicators through dimensionality reduction. Method: The proposed experiment involves conducting a comparative test on MOV with different time intervals between impacts, on the order of 10 seconds. The data collected from this experiment, with a time resolution of 10 seconds, will be subjected to dimensionality reduction using PCA to reduce the correlation between the original indicators. Finally, the GS-SVR model will be employed to analyze and predict the effects of single and continuous pulse impacts on MOV. Results: Experimental results demonstrate that the GS-SVR model achieves a mean square error of less than 0.00057 in predicting single pulse impacts and still exhibits certain effectiveness for irregular pulse impacts, such as continuous pulses. Conclusion: The proposed fault diagnosis algorithm based on PCA and GS-SVR can effectively improve the fault diagnosis rate of MOV, and accurately predict the fault state of MOV under single and continuous impulse shock. This is of great significance to the safe operation of power system.

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“…In this study, the dynamic characteristics of semiconductor devices are equivalent to the parallel connection of junction capacitance and internal resistance, where reflecting the nonlinear voltage distribution caused by the semiconductor's physical process is difficult. In [18], the effect of multi-pulse lightning stroke on the aging characteristics of ZnO varistor is analyzed. It is pointed out that pulse number and pulse interval play a decisive role in the aging speed of the ZnO varistor.…”

Section: Introductionmentioning

confidence: 99%

Research on Lightning Overvoltage Characteristics of High-Voltage Diode Rectifier

Peng¹,

ChuanMing

Yang

et al. 2022

Electronics

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Failure of the high-voltage diode rectifier caused by lightning will cause huge losses. The traditional analysis of overvoltage induced by the high-voltage diode rectifier shell under lightning stroke cannot adapt to the overvoltage process caused by lightning stroke-induced conduction invading the inside of the high-voltage diode rectifier. Therefore, this paper proposes to establish a high-frequency equivalent model of the core components of the high-voltage diode rectifier, including diodes, reactors, transformers, and overhead lines. On this basis, a lightning overvoltage model of lightning-induced conduction into the high-voltage diode rectifier is built, and the transient process of diode lightning overvoltage under the constraint of reverse recovery charge is analyzed. Then, we describe the transient distribution of overvoltage in high-voltage diode rectifiers caused by lightning stroke. The transient distribution of overvoltage induced by lightning in series diodes under different diode equivalent models is analyzed by simulation. The simulation results show that the inconsistent parameters of series diodes can easily lead to diode damage due to uneven voltage distribution when lightning strikes. Therefore, this paper puts forward a scheme to reduce lightning damage, including selecting diodes with the same parameters and adding fast-melting fuses at the transformer’s secondary side and in front of the series diode bridge arm. The simulation shows that the scheme proposed in this paper can effectively prevent the high-voltage diode rectifier from being damaged by lightning strikes.

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An Experimental Study on the Effect of Multiple Lightning Waveform Parameters on the Aging Characteristics of ZnO Varistors

Cited by 11 publications

References 11 publications

Modelling of Low-Voltage Varistors’ Responses under Slow-Front Overvoltages

Modelling of Low-Voltage Varistors’ Responses under Slow-Front Overvoltages

Research on the Prediction Method of MOV Deterioration State Based on Principal Component Analysis and Grid Search- Optimized Support Vector Machine Regression Algorithm

Research on Lightning Overvoltage Characteristics of High-Voltage Diode Rectifier

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