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IEEE C57.115-1991

IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Rated in Excess of 100 MVA (65C Winding Rise) (Folded into C57.91-1995) (65C Winding Rise)
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IEEE C57.115-1991

IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Rated in Excess of 100 MVA (65C Winding Rise) (Folded into C57.91-1995) (65C Winding Rise)

PUBLISH DATE 1991
PAGES 42
IEEE C57.115-1991

Revision Standard - Inactive-Withdrawn.

The guide covers modern power transformers rated above 100 MVA, three-phase equivalent and 65 °C rise. The general approach is tutorial.

Four different types of loading are considered:

  • normal life expectancy loading,
  • planned loading beyond nameplate rating,
  • long-time emergency loading, and
  • short-time emergency loading.

The various effects of loading a transformer in excess of its nameplate rating are discussed. Temperature and maximum loading limitations are suggested.

This guide covers general recommendations for loading mineral-oil immersed power transformers manufactured in accordance with IEEE C57.12.00-1987 III' and having a maximum nameplate rating in excess of 100 phase.

Such transformers have an average winding rise of 65 °C maximum and a hottest spot rise of 80 °C maximum at rated load.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.115
Publication Date Dec. 27, 1991
Language en - English
Page Count 40
Revision Level
Supercedes
Committee Transformers
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