2010•The Transactions of The Korean Institute of Electrical EngineersRequires access

Analyses on Electrical-Mechanical Characteristics of Environment-friendly Transformer Insulating Material by Accelerated Thermal Aging

Myeong-Seop Shim, Jung-Sik An, Sun‐Ho Choi, Jung-Il Jeong, Tae‐Ho Lee, Chang‐Su Huh

Abstract

Aging of transformer insulating material in natural ester insulating oil is compared to that in conventional transformer oil. Aging of insulating paper and insulating oil have been studied by performing accelerated thermal aging test. Sealed aging test vessels containing cooper, laminated core, Kraft paper and insulating oil(natural oil or mineral oil) were aged at for 500, 1000, 1500 and 2000 hours. Insulating oils after aging are investigated with total acid number, breakdown voltage and viscosity. Also, degradation of insulating paper after aging is determined using breakdown voltage and mechanical strength. Accelerated aging studies demonstrate a slower aging rate for natural ester insulating oil compared to the rate for conventional mineral oil.

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Key concepts: Mineral oil, Materials science, Transformer oil, Kraft paper, Electrical insulation paper, Composite material, Accelerated aging, Transformer