Data record `std.ieee-c57-12-90.structure.ratio`

Verified 2026-10-24 Confidence: High

Clause 7 of IEEE C57.12.90-2021 covers the ratio test: the definition and test conditions in clause 7.1, a tolerance reference to IEEE C57.12.00-2021 in clause 7.2, and the voltmeter, comparison and ratio-meter methods in clause 7.3.

Provenance. Where this record comes from and where it is used: the cited source, the record itself and the entry that cites it.

Provenance: the chain from source to entry.
Step	Item	Detail
Source	IEEE C57.12.90-2021	Licensed standard, clause 7
Data record	std.ieee-c57-12-90.structure.ratio	Verified 2026-10-24
Entry	IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers	No revisions

Subject: IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers (Standards)
Kind: Standard scope
Source: IEEE C57.12.90-2021, clause 7, Test Code for Liquid-Immersed Distribution, Power and Regulating Transformers, IEEE.

History

Every recorded change to this data record, oldest first.
Date	Change
2026-10-24	created
2026-10-24	review_status unreviewed -> software_reviewed

Cite this page

Cite the governing standard for the fact itself; cite this page as the finding aid.

"Data record std.ieee-c57-12-90.structure.ratio." Transformer Testing Reference. 2026-10-24. https://www.transformertestingreference.com/data/std.ieee-c57-12-90.structure.ratio/.

Transformer Testing Reference, Data record std.ieee-c57-12-90.structure.ratio (Oct. 24, 2026), https://www.transformertestingreference.com/data/std.ieee-c57-12-90.structure.ratio/.

@misc{etr-data-std-ieee-c57-12-90-structure-ratio,
  title = {Data record std.ieee-c57-12-90.structure.ratio},
  howpublished = {\url{https://www.transformertestingreference.com/data/std.ieee-c57-12-90.structure.ratio/}},
  organization = {Transformer Testing Reference},
  publisher = {Transformer Testing Reference},
  year = {2026},
  note = {last substantive change 2026-10-24}
}

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