Ratio error
Updated 2026-10-27
Data records
- Ratio error is the amount by which the actual ratio of an instrument transformer departs from its rated ratio, expressed as a fraction of the actual ratio; it describes how far the magnitude of the secondary quantity differs from the value the nameplate ratio predicts.
- A current transformer analyzer determines ratio error together with phase displacement by applying a low-level test signal to the secondary winding and evaluating an equivalent circuit model of the transformer, and it reports the result against the accuracy class limits of a selected standard with a pass or fail indication.
Elsewhere in the family
- Instrument Transformer Ratio and Phase Angle related entry on Revenue Metering Reference
Sources
- Electrical Testing Reference editorial taxonomy, Electrical Testing Reference editorial taxonomy of test methods, 2026-10 edition, Electrical Testing Reference. Held as: Own observation.
- OMICRON product page, CT Analyzer, web page edition, OMICRON electronics. Held as: Public page. Publisher page
Changelog (5 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (gloss.ratio-error.definition) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (gloss.ratio-error.definition) | |
| 2026-10-27 | created (gloss.ratio-error.usage) | |
| 2026-10-27 | revised (gloss.ratio-error.usage) | |
| 2026-10-27 | review_status unreviewed -> software_reviewed (gloss.ratio-error.usage) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Ratio error." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/glossary/ratio-error/.
Test Instrument Reference, Ratio error (Oct. 27, 2026), https://www.testinstrumentreference.com/glossary/ratio-error/.
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howpublished = {\url{https://www.testinstrumentreference.com/glossary/ratio-error/}},
organization = {Test Instrument Reference},
publisher = {Test Instrument Reference},
year = {2026},
note = {last substantive change 2026-10-27}
}{{cite web |title=Ratio error |website=Test Instrument Reference |publisher=Test Instrument Reference |url=https://www.testinstrumentreference.com/glossary/ratio-error/ |date=2026-10-27 |access-date=}}