Test Instrument Reference

Data record instr.transformer-turns-ratio-tester.single-phase-versus-three-phase

Verified 2026-10-27 Confidence: High

A single-phase tester measures a three-phase transformer one phase at a time, which loses accuracy on a delta-connected low-voltage winding because the winding under test is loaded by the other two legs of the delta; a three-phase source excites all three phases at once, gives a more uniform flux distribution, and makes the result less sensitive to the excitation voltage.

ProvenanceMegger product page supports data record instr.transformer-turns-ratio-tester.single-phase-versus-three-phase, which is cited on the entry Transformer turns ratio tester.SOURCEMegger product pageMegger product pageManufacturer pageDATA RECORDinstr.transformer-turns-ratio-tester.single-phase-versus-three-phaseinstr.transformer-turns-..Verified 2026-10-27ENTRYTransformer turns ratio testerTransformer turns ratio ..No revisions
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StepItemDetail
SourceMegger product pageManufacturer page
Data recordinstr.transformer-turns-ratio-tester.single-phase-versus-three-phaseVerified 2026-10-27
EntryTransformer turns ratio testerNo revisions
Subject
Transformer turns ratio tester (Instrument classes)
Kind
Instrument fact
Source
Megger product page, web page edition, TTRU3 True three-phase transformer turns ratio tester, Megger. Publisher page

History

Every recorded change to this data record, oldest first.
DateChange
2026-10-27created
2026-10-27review_status unreviewed -> software_reviewed

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"Data record instr.transformer-turns-ratio-tester.single-phase-versus-three-phase." Test Instrument Reference. 2026-10-27. https://www.testinstrumentreference.com/data/instr.transformer-turns-ratio-tester.single-phase-versus-three-phase/.