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JEET, Vol. 13, No. 1, January 2018
DGA Gases related to the Aging of Power Transformers for Asset Management
Yongho Hur
Area C - Electrophysics and Applications
Abstract Life management technology is required as the failure risk of aged power transformers increases. Asset management technology is developed to evaluate the remaining life, establish the replacement strategies, and decide the optimal investment based on the reliability and economy of power transformers. The remaining life assessment uses data such as installation, operation, maintenance, refurbishment, and failure of power transformers. The optimal investment also uses data such as maintenance, outage, and social costs. To develop the asset management system for power transformers, determining the degradation parameters related to the aging of power transformers and evaluating the condition of power transformers using these parameters are important. In this study, since 1983, 110,000 Dissolved Gas Analysis (DGA) data have been analyzed to determine the degradation parameters related to the aging of power transformers. The alarm rates of combustible gases (H2, C2H2, C2H4, CH4, and C2H6), TCG, CO, and CO2 were analyzed. The end of life and failure rate (bathtub curve) of power transformers were also calculated based on the failure data from 1981 to 2014. The DGA gases related to discharge, overheating, and insulation degradation were determined based on alarm and failure rates. C2H2, C2H6, and CO2 were discharge, oxidation, and insulation degradation parameters related to the aging of power transformers.
Keyword Alarm rate,Degradation parameter,DGA,Failure rate,Power transformer
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