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Distribution Transformer Life Assessment with Ambient Temperature Rise Projections

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This article describes the use of an improved top oil temperature rise model of a distribution transformer. The IEEE Standard C57.91-1995 model for transformer thermal calculations is discussed briefly, and a loss of life calculation based on the “10-degree rule” is formulated. This loss of life formulation is used with the improved model for top oil temperature rise to assess the impact of ambient temperature change on distribution transformer life. A probabilistic model for ambient temperature rise is used, and an increased ambient temperature of 3.5°C in 100 years is studied. Seven artifact transformers and four loading test beds are considered. The service life calculated for a base case and an increased ambient temperature case shows that there is a reduction of the order of 3-6 years for the cases studied.

Keywords: 10-degree rule; IEEE C57.91; distribution engineering; distribution transformer; loading test bed; loss of life; top oil temperature rise; transformer thermal model

Document Type: Research Article


Affiliations: 1: Power Systems Engineering Research Center, Arizona State University, Tempe, Arizona, USA 2: Salt River Project, Phoenix, Arizona, USA

Publication date: September 1, 2009

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