NDLI: Using the three-parameter Weibull distribution in assessment of threshold strength of pressboard impregnated by different liquid dielectrics

Content Provider	IET Digital Library
Author	Rozga, Pawel
Abstract	This study presents the results of the measurements of electrical strength of pressboard specimens impregnated with three different liquid dielectrics: mineral oil, natural ester and synthetic ester. In the experiment carried out in accordance with IEC 60243 standard, two types of pressboard specimens of thicknesses 0.5 and 1 mm, respectively, were considered. The data obtained during the measurements in the form of breakdown voltages were used for calculation of the electrical strength. Both standard-based approach where median value was taken into account in calculations and statistical approach using three-parameter Weibull distribution function where location parameter V 0 was considered were applied. The results obtained on the basis of both approaches showed that both the specimens impregnated with mineral oil and ester liquids gave the satisfactory results within the electrical strength determined, which in all cases was higher than minimum required for the impregnated pressboards. The differences indicating slightly better impregnation properties of mineral oil, when the same impregnation conditions are used, are noticeable especially in the case of location parameter of Weibull distribution function. However, these differences are small and in relation to the requirements for the impregnated pressboards may be treated as negligible.
Starting Page	665
Ending Page	670
Page Count	6
ISSN	17518822
Volume Number	10
e-ISSN	17518830
Issue Number	Issue 6, Sep (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/10/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2016.0061
Journal	IET Science, Measurement & Technology
Publisher Date	2016-09-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Breakdown Voltage Dielectric Breakdown And Discharges Dielectric Liquids Electric Breakdown Electric Strength Electrical Strength Measurement IEC 60243 Standard Liquid Dielectrics Measurement of Basic Electric And Magnetic Variables Mineral Oil Minerals Natural Ester Oils Pressboard Impregnated Specimen Probability Theory Size 0.5 Mm Size 1 Mm Statistical Analysis Statistical Approach Statistics Stochastic Linearised SCUC Synthetic Ester Three-parameter Weibull Distribution Voltage Measurement Weibull Distribution
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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