Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 124
tively simple, certainless evident principles are involved in theequivalent determinations in polyphase cir-cuits. Two-wattmeter Method of MeasuringPower.—The power absorbed in a three- Power — Power Absorption 413 phase three-wire star- or delta-connectedsystem, whatever the distribution of… … Two-wattmeter Method of MeaBuring Power the current flowing in a supply main by c(both rms values) and the angle of lag by <}>,then the mean power is P = Vc cos {<t> - 30°) -f Vc cos (^ + 30°)= ^3 V c cos <l>. As the system is balanced, ^, the angle oflag, is the same for each…
Electrical engineering
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