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This is an interpretation of IEEE Std C57.91-1995. Interpretations are issued to explain and clarify the intent of a standard and are not intended to constitute an alteration to the original standard or to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standard Department for the appropriate license. Use of the information contained in this document is at your own risk.
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December 5, 2001
SH94349
Interpretation Number: 1
Topic: Error in Note "a" of Table 8.
Relevant Clause: Table 8; subclause 9.3.1
In IEEE Std C57.91-1995, IEEE Guide for Loading Mineral-Oil-Immersed Transformers, Note "a" of Table 8 reads 110 degrees C. This is incorrect. Is the allowed continuous temperature 110 degrees C or is it 100 degrees C?
There is an error in Note "a" of Table 8. IEEE has recently sent out an Invitation to Ballot for a corrigenda to C57.12.91. It includes corrections to several portions of the document. When the corrigenda is approved, Note "a" of Table 8 will be corrected to say 110 degrees C, rather than the 100 degrees C.
Clause 9.3.1 explains that the requirements for loading are in C57.12.00-2000, IEEE Trial-Use General Requirements and Test Code for Dry-Type and Oil-Immersed Smoothing Reactors for DC Power Transmission. It also states that the continuous operation limit for the hottest-spot temperature is 110 degrees C.
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