DocumentCode :
1200286
Title :
Power transformer temperature evaluation for overloading conditions
Author :
Jardini, José Antonio ; Brittes, José Luiz Pereira ; Magrini, Luiz Carlos ; Bini, Marco A. ; Yasuoka, Jorge
Author_Institution :
Sao Paulo Univ., Brazil
Volume :
20
Issue :
1
fYear :
2005
Firstpage :
179
Lastpage :
184
Abstract :
The calculation methodologies of transformers´ hottest spot and top oil temperatures are evaluated in this paper. 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.
Keywords :
optical cables; overvoltage; power transformer testing; fiber-optic cable; oil temperature; overloading condition; power transformer temperature evaluation; transformer factory test; Helium; IEC standards; Oil insulation; Optical fiber cables; Optical fiber sensors; Optical fiber testing; Petroleum; Power transformers; Production facilities; Temperature sensors; Overloading; power transformer loading; temperature;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2004.835433
Filename :
1375092
Link To Document :
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