DocumentCode :
916248
Title :
An alternative evaluation of distribution transformers to achieve the lowest TOC
Author :
Baranowski, J.F. ; Hopkinson, P.J.
Author_Institution :
Cooper Ind. Inc., Franksville, WI, USA
Volume :
7
Issue :
2
fYear :
1992
fDate :
4/1/1992 12:00:00 AM
Firstpage :
614
Lastpage :
619
Abstract :
The 65°C rise rating of a distribution transformer is a thermal life rating of its insulation system, not the best efficiency condition. Total owning cost (TOC) is reference at 85°C which is based on a 20°C ambient plus a 65°C rise. For better efficiency, a transformer should be operated at a lower temperature. Transformer design programs calculate a design for the lowest TOC at the 85°C reference temperature. These programs do not calculate a design for the lowest possible temperature rise or lowest TOC regardless of reference temperature. As a consequence, the lowest TOC is not realized. An evaluation method is proposed that will provide the user with a distribution transformer design which has a lower operating temperature rise, thus improving both the transformer´s efficiency and the customer´s TOC
Keywords :
power transformers; transformer insulation; distribution transformers; insulation system; thermal life rating; total owning cost; transformer efficiency; Core loss; Costs; Design optimization; Electrical equipment industry; Oil insulation; Performance loss; Power industry; Power systems; Power transformer insulation; Temperature distribution;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/61.127057
Filename :
127057
Link To Document :
بازگشت