Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 353
s known as a three-wiretwo-phase system. This would be impossible with only onewinding, for if any tWO of the rings were together it wouldshort-circuit the winding. Since the e.m.f.s of the two phases are out of step by 90deg., the voltage between the two outside terminals, Fig. 387,will not be… … TWO-PHASE AND THREE-PHASE CIRCUITS 337 By adding the two e.m.f.s vectorially, tlie parallelogramOACB, Fig. 389, is formed, the diagonal OC being the re-sultant of the two voltages and representing to scale thepressure between the two outside terminals in Fig. 387. Inthis case since the two e.m.f.s…
Electric machinery
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