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http://dx.doi.org/10.4313/JKEM.2020.33.1.1

A Statistical Analysis to the VLF Tanδ Criteria for Aging Diagnosis in Power Cables  

Jung, Woosung (Department of Electrical Engineering, Mokpo National University)
Kim, Seongmin (Power Big-data Center, Korea Electric Power Corporation (KEPCO))
Lim, Jangseob (Division of Marine Mechatronics, Mokpo National Maritime University)
Lee, Jin (Department of Electrical Engineering, Mokpo National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.33, no.1, 2020 , pp. 1-5 More about this Journal
Abstract
In this study, the objective is to improve the criteria used for statistical comparison of the VLF tanδ (TD) database and failure rate according to water-tree degradation in underground distribution power cables. The aging condition of the KEPCO criteria is divided into 6 levels using the Weibull distribution, and the "failure imminent" condition is quantified by using the statistical end-point of the lifetime parameter of the VLF big-data group obtained from KEPCO. Moreover, new criteria with a 2-dimensional combination of TD, DTD, and a statistical normalized factor are suggested. These criteria exhibit high reproducibility for the detection of cables in an imminent failure state. Consequently, it is expected that the adoption of the extended VLF-2019 criteria will reduce the asset management cost of cable replacement compared to the VLF-2012 criteria of KEPCO.
Keywords
VLF $tan{\delta}$; Underground cables; Weibull distribution; Normalized factor; 2 Dimensional combination;
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