Transformer Testing Reference

Data record tests.transformer-turns-ratio.ieeec57-12-90.conditions

Verified 2026-10-24 Confidence: Medium

Clause 7.1 of IEEE C57.12.90-2021 runs the ratio test at rated or lower voltage and at rated or higher frequency, prefers single-phase excitation on three-phase units when each phase is accessible, and, where a wye neutral is inaccessible, creates a virtual neutral by shorting one phase with the connections of Figure 9.

ProvenanceIEEE C57.12.90-2021 supports data record tests.transformer-turns-ratio.ieeec57-12-90.conditions, which is cited on the entry Transformer Turns Ratio.SOURCEIEEE C57.12.90-2021IEEE C57.12.90-2021Licensed standard, clause 7.1.2, 7.1.3, 7.1.4DATA RECORDtests.transformer-turns-ratio.ieeec57-12-90.conditionstests.transformer-turns-..Verified 2026-10-24ENTRYTransformer Turns RatioTransformer Turns RatioNo revisions
Provenance. Where this record comes from and where it is used: the cited source, the record itself and the entry that cites it.
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StepItemDetail
SourceIEEE C57.12.90-2021Licensed standard, clause 7.1.2, 7.1.3, 7.1.4
Data recordtests.transformer-turns-ratio.ieeec57-12-90.conditionsVerified 2026-10-24
EntryTransformer Turns RatioNo revisions
Subject
Transformer Turns Ratio (Test methods)
Kind
Method fact
Source
IEEE C57.12.90-2021, clause 7.1.2, 7.1.3, 7.1.4, Test Code for Liquid-Immersed Distribution, Power and Regulating Transformers, IEEE.

History

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

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"Data record tests.transformer-turns-ratio.ieeec57-12-90.conditions." Transformer Testing Reference. 2026-10-24. https://www.transformertestingreference.com/data/tests.transformer-turns-ratio.ieeec57-12-90.conditions/.