Power transformer temperature evaluation for overloading
IEEE Power Engineering Society General Meeting, 2004.(2005)
摘要
Summary form only given. The calculation methodologies of transformers hottest spot and top oil temperatures, are evaluated in This work. Thereafter, a comparison between the calculated and the values obtained during the assessment of a transformer factory test, was realized. The referred tests were conducted using an ONAF type, 30/40 MVA, 138/13.8 kV transformer, in which, sensors with fiber-optic cables, to record directly the internal parameters, were installed. In a first series of tests, transformer loadings corresponding to 100%, 70% and 116.5% of rated power, were used. The tests were completed by applying values of a daily load profile with several hourly power levels. Additionally, in two of the hourly periods, high temporary loadings one of 160% during 30 minutes, and another of 170% during 15 minutes, were applied.
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关键词
transformer,temperature
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