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    An Assessment on Aging Model of IEEE/IEC Standards for Natural and Mineral Oil-Immersed Transformer
    (Ieee, 2011) Biçen, Yunus; Çilliyüz, Yusuf; Aras, Faruk; Ayduğan, Güzide
    This paper presents an assessment on aging model of IEEE and IEC standards using thermal model of oil-immersed power transformer for natural ester and mineral oil. For this purpose, a model created for the analysis of behavior transient thermal performance with aging both of natural ester and mineral oils. Thermal model of the transformer is based on thermal-electrical analogy that is calculated separately for natural and mineral oils covering top-oil and hot-spot temperatures. The hot-spot temperature values of each ester/oil are used to calculate aging parameters which include the aging acceleration factor, time dependent relative aging rate and insulation life loss variations.