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IEEE C57.120-1991

Historical Revision

IEEE Guide for Loss Evaluation of Distribution and Power Transformers and Reactors

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New IEEE Standard - Superseded. A method for establishing the dollar value of the electric power needed to supply the losses of a transformer or reactor is provided. Users can use this loss evaluation to determine the relative economic benefit of a high-first-cost, low-loss unit versus one with a lower first cost and higher losses, and to compare the offerings of two or more manufacturers to aid in making the best purchase choice. Manufacturers can use the evaluation to optimize the design and provide the most economically unit to bid and manufacture. The various types of losses are reviewed.
The purpose of this guide is to provide a method of establishing the dollar value of the electric power needed to supply the losses of a transformer or reactor. Users can use this losses evaluation to determine the relative economic benefit of a high-first-cost, low-loss unit versus one with a lower first cost and higher losses. Manufacturers can use the evaluation to optimize the design and provide the most economical unit to bid and manufacture. The evaluated cost of losses also enables a user to compare the offerings of two or more manufacturers to aid in making the best purchase choice among competing transformers or reactors. Loss evaluation also provide information to a user for establishing the optimum time to retire or replace existing units with modern low-loss transformers or reactors.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.120
Publication Date Aug. 12, 1992
Language en - English
Page Count 28
Revision Level
Supercedes
Committee Transformers
Publish Date Document Id Type View
Oct. 18, 2017 C57.120-2017 Revision
Aug. 12, 1992 C57.120-1991 Revision