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Although this paper treats of the general case of floating neutral polyphase systems, one of its prime objects is to find the very simplest method of solving three-phase unbalanced star circuits. The method presented below is considered much simpler than the one in which the star circuit is replaced by an equivalent delta circuit; also simpler than the method of replacing one unbalanced circuit by two balanced circuits, one being subjected to direct phase rotation and the other to opposite phase rotation. Although these methods are fairly useful for the three-phase case, they become very unwieldy for a number of phases greater than three. Not only is this method more simple than any so far proposed, but it is a direct method, based on a straight forward application of Kirchhoff's Laws. A final and very important advantage of the method is that all the results are perfectly general, applying equally as well to a single-phase system as to any polyphase star system.
American Institute of Electrical Engineers, Journal of the (Volume:42 , Issue: 10 )
Date of Publication: Oct. 1923