Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications
Thanks to the performance improvement introduced by micro sized functional fillers, application of epoxy composites for electrical insulation purposes has become popular. This paper investigates the dielectric properties of epoxy micro-composites filled with alumina (Al<sub>2</sub>O<s...
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2024-11-01
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| author | Changyeong Cheon Dongmin Seo Myungchin Kim |
| author_facet | Changyeong Cheon Dongmin Seo Myungchin Kim |
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| description | Thanks to the performance improvement introduced by micro sized functional fillers, application of epoxy composites for electrical insulation purposes has become popular. This paper investigates the dielectric properties of epoxy micro-composites filled with alumina (Al<sub>2</sub>O<sub>3</sub>). In particular, measurements of relative permittivity, dissipation factor, and electrical breakdown are performed, and a comprehensive statistical analysis on dielectric properties was conducted. AC breakdown strength (AC-BDS) was analyzed for normal distribution using four methods (Anderson–Darling, Shapiro–Wilk, Ryan–Joiner, and Kolmogorov–Smirnov). In addition, the AC-BDS was analyzed at risk probabilities of 1%, 5%, 10%, and 50% using Weibull distribution functions. Both normal and Weibull distributions were evaluated using the Anderson–Darling (A-D) statistic and <i>p</i>-value. Additionally, the log-normal, gamma, and exponential distributions of AC-BDS were examined by A-D goodness-of-fit test. The hypothesis test results of AC-BDS were fit by normal and Weibull distributions, and the compliance was evaluated by <i>p</i>-value and each method statistics. In addition, the experimental results of AC-BDS were fit by log-normal and gamma distributions, and the goodness-of-fit was evaluated by <i>p</i>-value and A-D testing. On the other hand, exponential distribution was not suitable for <i>p</i>-value and A-D testing. The results showed that the distributions of AC-BDS were the best using log-normal distribution. Meanwhile, statistical analysis results verified the apparent effect of temperature on dielectric properties using a paired <i>t</i>-test. The analysis results of this paper not only contribute to better characterization of epoxy/Al<sub>2</sub>O<sub>3</sub> micro-composites but also introduce a comprehensive approach for performing statistical analysis for electrical insulation materials. |
| format | Article |
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| spelling | doaj-art-ef2c28aeda33498ea94ee0ab4e5523082025-08-20T02:26:59ZengMDPI AGApplied Sciences2076-34172024-11-0114221050610.3390/app142210506Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage ApplicationsChangyeong Cheon0Dongmin Seo1Myungchin Kim2School of Electrical Engineering, College of Electrical and Computer Engineering, Chungbuk National University, Cheongju 28644, Republic of KoreaSchool of Electrical Engineering, College of Electrical and Computer Engineering, Chungbuk National University, Cheongju 28644, Republic of KoreaSchool of Electrical Engineering, College of Electrical and Computer Engineering, Chungbuk National University, Cheongju 28644, Republic of KoreaThanks to the performance improvement introduced by micro sized functional fillers, application of epoxy composites for electrical insulation purposes has become popular. This paper investigates the dielectric properties of epoxy micro-composites filled with alumina (Al<sub>2</sub>O<sub>3</sub>). In particular, measurements of relative permittivity, dissipation factor, and electrical breakdown are performed, and a comprehensive statistical analysis on dielectric properties was conducted. AC breakdown strength (AC-BDS) was analyzed for normal distribution using four methods (Anderson–Darling, Shapiro–Wilk, Ryan–Joiner, and Kolmogorov–Smirnov). In addition, the AC-BDS was analyzed at risk probabilities of 1%, 5%, 10%, and 50% using Weibull distribution functions. Both normal and Weibull distributions were evaluated using the Anderson–Darling (A-D) statistic and <i>p</i>-value. Additionally, the log-normal, gamma, and exponential distributions of AC-BDS were examined by A-D goodness-of-fit test. The hypothesis test results of AC-BDS were fit by normal and Weibull distributions, and the compliance was evaluated by <i>p</i>-value and each method statistics. In addition, the experimental results of AC-BDS were fit by log-normal and gamma distributions, and the goodness-of-fit was evaluated by <i>p</i>-value and A-D testing. On the other hand, exponential distribution was not suitable for <i>p</i>-value and A-D testing. The results showed that the distributions of AC-BDS were the best using log-normal distribution. Meanwhile, statistical analysis results verified the apparent effect of temperature on dielectric properties using a paired <i>t</i>-test. The analysis results of this paper not only contribute to better characterization of epoxy/Al<sub>2</sub>O<sub>3</sub> micro-composites but also introduce a comprehensive approach for performing statistical analysis for electrical insulation materials.https://www.mdpi.com/2076-3417/14/22/10506epoxy/Al<sub>2</sub>O<sub>3</sub> micro-compositesbreakdown strengthstatistical analysisWeibull distributionnormal distributiongoodness-of-fit test |
| spellingShingle | Changyeong Cheon Dongmin Seo Myungchin Kim Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications Applied Sciences epoxy/Al<sub>2</sub>O<sub>3</sub> micro-composites breakdown strength statistical analysis Weibull distribution normal distribution goodness-of-fit test |
| title | Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications |
| title_full | Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications |
| title_fullStr | Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications |
| title_full_unstemmed | Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications |
| title_short | Statistical Analysis of AC Breakdown Performance of Epoxy/Al<sub>2</sub>O<sub>3</sub> Micro-Composites for High-Voltage Applications |
| title_sort | statistical analysis of ac breakdown performance of epoxy al sub 2 sub o sub 3 sub micro composites for high voltage applications |
| topic | epoxy/Al<sub>2</sub>O<sub>3</sub> micro-composites breakdown strength statistical analysis Weibull distribution normal distribution goodness-of-fit test |
| url | https://www.mdpi.com/2076-3417/14/22/10506 |
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