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Note on the Measurement of Transformer Turns-Ratio

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1 Author(s)
Honnell, P.M. ; Signal Corps, U.S. Military Academy, West Point, New York

This note shows that in many important cases the turns-ratio of iron-core transformers is given by the simple relation N1/N2= √Xsc1/Xsc2, in which Xsc1and Xsc2are the reactive components of the short-circuit primary and secondary impedance of the windings concerned. The measurements are conveniently made with an impedance or inductance bridge. This equation also gives the turns-ratio of certain air-core transformers.

Published in:

Proceedings of the IRE  (Volume:33 ,  Issue: 11 )