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Statistical analysis of breakdown voltage sin virgin and aged LDPE using Johnson SB and Weibull Distribution

Bani, Nurul Aini and Abd. Malek, Zulkurnain and Ahmad, Hussein (2015) Statistical analysis of breakdown voltage sin virgin and aged LDPE using Johnson SB and Weibull Distribution. In: Applied Mechanics And Materials, 2015.

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Official URL: https://www.researchgate.net/publication/282135466...

Abstract

Polymeric material such as low density polyethylene (LDPE) has been used for decades as insulating material. Any polymeric material will experience degradation after prolonged application of high electrical stresses. Deeper understanding of the long term electrical degradation of the insulating material is necessary to predict the life of high voltage cable. Electroluminescence method (EL) is used to detect the breakdown voltages of thin film LDPE. This method utilizes a Peltier cooled electron multiplying charge coupled device (EMCCD) camera to detect the breakdown of the sample. Statistical distribution of the AC breakdown voltages of 100µm virgin and aged LDPE has been analysed. Comparison for the best fitted distribution was made for Weibull distribution and Johnson SB distribution using Anderson-Darling (A2) goodness-of-fit and Kolmogorov-Smirnov (D) goodness-of-fit (GOF). Johnson SB is rarely used in high voltage engineering application. The probability density function (PDF) and the cumulative density function (CDF) for both distributions are defined in this article. The statistical parameters used are estimated based on Maximum Likelihood Estimation (MLE) for both distributions. Based on the statistical analysis, it is observed that Johnson SB provide better fitting than Weibull distribution with lower fitting error and that 3-parameter Weibull is much better fitting than 2-parameter Weibull distribution for most cases. It is also found that the median breakdown voltage of LDPE samples decreases with increasing aging temperature.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:electroluminescence, weibull distribution
Subjects:Q Science > QC Physics
Divisions:Razak School of Engineering and Advanced Technology
ID Code:61211
Deposited By: Widya Wahid
Deposited On:19 Mar 2017 15:09
Last Modified:03 Aug 2017 12:18

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