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Power in ThreePhase Circuit by ThreeWattmeter MethodAuthor: E.E. Kimberly The power in a threephase system may be measured by placing a singlephase wattmeter in each phase and adding the three readings. This method is possible in a A system only if the phase units can be separated and in a Ysystem only if the neutral or wye point can be reached. Fig. 95 shows the proper arrangement of wattmeters. In either (a) or (b),
By equation (91), in which V_{0}1 is used instead of V_{0}2, Therefore, and (94) This value is the power factor of the balanced system whether Δconnected or Yconnected.


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