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Author: search.filters.author.Zinck, Matthieu

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    Experiment of Dielectric Frequency Response for Aged ZnO Surge Arrester
    (2025-01-01)
    Aiamrungruang, Phitthaya
    ;
    Methavithit, Winai
    ;
    Pannil, Pittaya
    ;
    Chuayin, Chaitawat
    ;
    Zinck, Matthieu
    Condition-based monitoring of surge arresters has gained increasing attention in modern power system asset management, especially for medium-voltage equipment. This paper presents an investigation into the dielectric frequency response (DFR) analysis technique as a diagnostic method to evaluate aging and unhealthy conditions in 21-kV metal oxide surge arresters (MOSA). Four types of simulated defects, excessive number of lightning current stress, cracking, moisture ingress, and tracking, were introduced to represent common field failures. The DFR technique enables frequencydomain interpretation of dielectric properties, providing insight into insulation behavior over a wide frequency range. The test results show a significant variation in capacitance and dissipation factor corresponding to different defect types. Among these, moisture ingress exhibited the most severe deterioration. The findings suggest that DFR is a viable offline diagnostic method that can support preventive maintenance strategies for high-voltage surge arresters.
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    Dielectric Response Analysis on Artificial ZnO Surge Arrester Degradation Using Polarization and Depolarization Current Based Method
    (2024-01-01)
    Chuayin, Chaitawat
    ;
    Pattanadech, Norasage
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    Zinck, Matthieu
    ;
    Methavithit, Winai
    ;
    Suksagoolpanya, Suthat
    This paper presents an alternative method to investigate the problems of surge arrester based on dielectric response analysis. The study is made using a 21-kV, 25-kA station class surge arrester to be test specimens, the former Zinc Oxide (ZnO) varistors inside were removed and replaced with artificial degraded ZnO varistors (impulse ageing, tracking problems, moisture ageing under wet and dry condition and cracking ZnO varistors). The experiments are carried out by Polarization and Depolarization Current (PDC) measurement. The test result analyses were proposed in terms of both the time domain and frequency domain. The measurement results show significant differences in dielectric response characteristics between healthy surge arresters and aged surge arresters. In addition, the dielectric response analysis tends to characterise the problems of surge arrester i.e., conduction problems and polarization problems which will be further discussed in this paper.
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    Investigation of Leakage Current Behavior Based on Current Symmetry Due to Multiple Positive and Negative Impulses
    (2024-01-01)
    Chuayin, Chaitawat
    ;
    Pattanadech, Norasage
    ;
    Zinck, Matthieu
    ;
    Suksagoolpanya, Suthat
    ;
    Sontayananon, Nattawittayawud
    The failure of Metal Oxide Surge Arrester becomes a major issue of the utilities. A strategy which is commonly utilized to diagnosis the problems is leakage current measurement in any terms of current e.g., total leakage current, resistive leakage current, capacitive leakage current. This paper aims to study the symmetrical behavior of the leakage current caused by positive and negative multiple lightning currents. The asymmetrical leakage currents were observed with 24 kV, 10kA commercial surge arrester which divided in to 2 groups. The experiment was conducted by measuring the leakage current at rated voltage and 1-mA reference voltage before applying a prepare of 5 shots of 10-kA positive and negative standard impulse current (8/20 μs) to groups I and II individually. After that, more 5 shots were applied to the specimens once more. The resistive leakage current at rated voltage and 1-mA reference voltage measurement were then performed after each impulse current application. Hence, groups I and II were applied with 15-shots multiple negative and positive impulse current respectively. The resistive leakage current at rated voltage and 1-mA reference voltage were performed after each 5 shots of impulse current. The experiment results show that (1) applying multiple impulse currents will make the asymmetrical leakage current. (2) positive polarity multiple impulse current creates asymmetry more than negative polarity. (3) negative polarity will increase the positive peak of leakage current and vice versa for positive polarity.
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    Application of Dielectric Spectroscopy Analysis to Identify Unhealthy Surge Arrester by Using PDC Measurement Technique
    (2024-01-01)
    Chuayin, Chaitawat
    ;
    Pattanadech, Norasage
    ;
    Zinck, Matthieu
    ;
    Suksagoolpanya, Suthat
    ;
    Methavithit, Winai
    At present, power grid asset management is becoming a topic of greater interest, as is the condition-based diagnosis of surge arresters to ensure power supply reliability on medium and high voltage networks. Extensive studies on failure mode and arrester forensics have been conducted and are continuing, investigating with various techniques, to predict and investigate their failures. This paper presents the investigation of dielectric spectroscopy of 21-kV MV surge arresters to identify unhealthy problems using Polarization and Depolarization current (known as PDC) measurement techniques, four artificial problems (which consist of lightning, cracking, moisture ingressive, and tracking problems) were simulated on surge arresters. With the PDC measurement, it is allowed to be interpreted in both the time domain and frequency domain. The dielectric parameters will be further presented and compared. The significant relationship of dielectric response characteristics is validated by test results and is highlighted in detail in this paper. Finally, an alternative invasive offline measurement technique is proposed for surge arrester failure detection.
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    The Effect of Electrical and Moisture Degradation of Metal Oxide Varistor with Insulation Diagnosis
    (2020-10-25)
    Chuayin, Chaitawat
    ;
    Zinck, Matthieu
    ;
    Kunakorn, Anantawat
    ;
    Pattanadech, Norasage
    Condition based monitoring of surge arresters (SA) has become a primary concern to ensure power supply quality on medium and high voltage networks. Understanding of SA behavior helps forecast their failure. This paper presents the analysis of dielectric response and conductivity of Metal Oxide Varistor (MOV) under degradation factors (normal ageing, impulse ageing and moisture ageing) using Polarization and Depolarization techniques. Normal ageing is represented by stressing the MOV with 115°C temperature. For impulse ageing, 20, 40 ,60 and 100 shots of positive and negative polarity of standard lightning impulses current were applied. Moisture ageing was performed by soaking MOV under 115°C temperature for 12 hours representing wet condition and the soaked blocks were left at room temperature for 24 hours representing dry condition. Polarization and Depolarization Current (PDC) was measured after each ageing step. Resistivity, conductivity and polarization index were interpreted for insulation diagnosis. The experiments were taken on the MOV with rated voltage 3 kV and 5kA-nominal discharge. The importance of nondestructive electrical diagnostics based on polarization methods is validated by test results and is highlighted in detail in this paper. Finally, the results of different ageing factors were compared and discussed.
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