Synopses & Reviews
Synopsis
Excerpt from Bulletin of the Bureau of Standards, Vol. 6: S. W. Stratton, Director, 1909-10
The ratio Of E, to E, is known as the ratio Of a potential trans former, and in general it differs appreciably from the ratio of E, ' to E, ' which is the ratio Of primary to secondary turns. The phase-angle between E, and E, reversed is the angle which it is proposed to measure. This may be either positive or negative.
If no current be taken from the secondary, E, becomes identical with E, ' N, I becomes identical with N, M I r, becomes smaller and farther from E, ' in phase; the ratio is more nearly the ratio of turns; the secondary emf. Is in advance of the primary. As the secondary current is increased the Ohmic drop in the sec ondary increases and E decreases; I, must increase to maintain M I r, increases and comes more nearly into phase with E, ' hence E, must be increased to maintain the same magnetic conditions, or if E, be maintained constant the ﬂux decreases and E, suffers further contraction, so that the ratio is increased; as, will in general increase and the phase angle will approach zero and finally become negative.
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