KIEE - The Transactions of the Korean Institute of Electrical Engineers

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The Transactions of the Korean Institute of Electrical Engineers

The Transactions of the Korean Institute of Electrical Engineers

ISO Journal TitleTrans. Korean. Inst. Elect. Eng.

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Title	Analyses on Electrical-Mechanical Characteristics of Environment-friendly Transformer Insulating Material by Accelerated Thermal Aging
Authors	심명섭(Shim, Myeong-Seop) ; 안정식(An, Jung-Sik) ; 최순호(Choi, Sun-Ho) ; 정중일(Jeong, Jung-Il) ; 이태호(Lee, Tae-Ho) ; 허창수(Huh, Chang-Su)
Page	pp.1832-1838
ISSN	1975-8359
Keywords	Natural ester ; Thermal aging ; Environment-friendly transformer
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 140°C 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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