NDLI: Using insulation aging to size transformers in high-ambient temperature, secondary-selective applications

Content Provider	IEEE Xplore Digital Library
Author	Helfrich, A. Carlson, R.W.
Copyright Year	2012
Description	Author affiliation: Saudi Arabian Oil Co., Saudi Arabia (Helfrich, A.; Carlson, R.W.)
Abstract	The electrical distribution systems in industrial facilities often incorporate a secondary-selective design where loads are fed from redundant transformers normally loaded to less than 50% of their kVA rating. When transformers are operating in ambient temperatures above 30 °C, IEEE Std C57.91 provides guidelines on how to load the transformers to compensate for the accelerated insulation aging. This guide is not directly applicable to secondary-selective systems since it assumes the transformer is being sized to supply the entire load on a continuous basis. This paper describes an approach for using insulation aging to size the transformer with an example using actual historical temperature data from an oil-production facility in a Middle-East country. The paper will demonstrate that transformers operating in a secondary-selective application do not have to be derated even when operating at ambient temperatures far in excess of the rated 30 °C. The resulting safety and economic benefits of the lower transformer kVA rating cascade throughout the power system.
Sponsorship	IEEE Ind. Applications Soc.
Starting Page	1
Ending Page	6
File Size	229493
Page Count	6
File Format	PDF
ISBN	9781467309240
ISSN	00903507
e-ISBN	9781467309257
DOI	10.1109/PCICON.2012.6549663
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Power distribution Power transformers
Content Type	Text
Resource Type	Article
Subject	Fuel Technology Energy Engineering and Power Technology

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