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Jamail, N.A.M.,Piah, M.A.M.,Muhamad, N.A.,Kamarudin, Q.E. The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.1
The Polarization and Depolarization Current (PDC) measurement is an efficient and effective diagnostic technique based on time domain measurement, for evaluating the high voltage insulation condition. This paper presents a review and comparison results from several published papers on the application of the PDC method to finding the conductivity and moisture content of various types of insulators. For solid insulation, the study was focused on cable insulation, electric machine stator insulation, and paper insulator in transformer insulation with different conditions. For liquid insulation, the review and comparison was done on biodegradable and mineral transformer oils, with fresh oil condition, and aged condition. The results from previous researchers tests were complied, analyzed and discussed, to evaluate the application of the PDC method to monitor the conductivity and moisture of HV equipment insulation systems. From the review results, the PDC technique successfully gives an indication of the conductivity and moisture level of high voltage insulation.
Ahmad, Mohd Hafizi,Bashir, Nouruddeen,Ahmad, Hussein,Piah, Mohamed Afendi Mohamed,Abdul-Malek, Zulkurnain,Yusof, Fadhilah The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
This paper presents a statistical approach to analyze electrical tree inception voltage, electrical tree breakdown voltage and tree breakdown time of unsaturated polyester resin subjected to AC voltage. The aim of this work was to show that Weibull and lognormal distribution may not be the most suitable distributions for analysis of electrical treeing data. In this paper, an investigation of statistical distributions of electrical tree inception voltage, electrical tree breakdown voltage and breakdown time data was performed on 108 leaf-like specimen samples. Revelations from the test results showed that Johnson SB distribution is the best fit for electrical tree inception voltage and tree breakdown time data while electrical tree breakdown voltage data is best suited with Wakeby distribution. The fitting step was performed by means of Anderson-Darling (AD) Goodness-of-fit test (GOF). Based on the fitting results of tree inception voltage, tree breakdown time and tree breakdown voltage data, Johnson SB and Wakeby exhibit the lowest error value respectively compared to Weibull and lognormal.
N. A. M. Jamail,M. A. M. Piah,N. A. Muhamad,Q. E. Kamarudin 한국전기전자재료학회 2014 Transactions on Electrical and Electronic Material Vol.15 No.1
The Polarization and Depolarization Current (PDC) measurement is an efficient and effective diagnostic techniquebased on time domain measurement, for evaluating the high voltage insulation condition. This paper presents areview and comparison results from several published papers on the application of the PDC method to finding theconductivity and moisture content of various types of insulators. For solid insulation, the study was focused on cableinsulation, electric machine stator insulation, and paper insulator in transformer insulation with different conditions. For liquid insulation, the review and comparison was done on biodegradable and mineral transformer oils, with freshoil condition, and aged condition. The results from previous researchers tests were complied, analyzed and discussed,to evaluate the application of the PDC method to monitor the conductivity and moisture of HV equipment insulationsystems. From the review results, the PDC technique successfully gives an indication of the conductivity and moisturelevel of high voltage insulation.
Mohd Hafizi Ahmad,Nouruddeen Bashir,Hussein Ahmad,Mohamed Afendi Mohamed Piah,Zulkurnain Abdul-Malek,Fadhilah Yusof 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
This paper presents a statistical approach to analyze electrical tree inception voltage, electrical tree breakdown voltage and tree breakdown time of unsaturated polyester resin subjected to AC voltage. The aim of this work was to show that Weibull and lognormal distribution may not be the most suitable distributions for analysis of electrical treeing data. In this paper, an investigation of statistical distributions of electrical tree inception voltage, electrical tree breakdown voltage and breakdown time data was performed on 108 leaf-like specimen samples. Revelations from the test results showed that Johnson SB distribution is the best fit for electrical tree inception voltage and tree breakdown time data while electrical tree breakdown voltage data is best suited with Wakeby distribution. The fitting step was performed by means of Anderson-Darling (AD) Goodness-of-fit test (GOF). Based on the fitting results of tree inception voltage, tree breakdown time and tree breakdown voltage data, Johnson SB and Wakeby exhibit the lowest error value respectively compared to Weibull and lognormal.