Theory and calculation of alternating current phenomena . watt curves of thedifferent branches of the system are pulsating also. Their sum,however, or the total power of the system, may be either con- 396 GENERAL POLYPHASE SYSTEMS 397 stant or pulsating. In the first case, the system is called abalanced system, in the latter case an unbalanced system. The three-phase system and the quarter-phase system, withequal load on the different branches, are balanced systems; withunequal distribution of load between the individual branchesboth systems become unbalanced systems. \ 0. \/ 1 ^ 0 0 0 0 01 Ac
Theory and calculation of alternating current phenomena . watt curves of thedifferent branches of the system are pulsating also. Their sum,however, or the total power of the system, may be either con- 396 GENERAL POLYPHASE SYSTEMS 397 stant or pulsating. In the first case, the system is called abalanced system, in the latter case an unbalanced system. The three-phase system and the quarter-phase system, withequal load on the different branches, are balanced systems; withunequal distribution of load between the individual branchesboth systems become unbalanced systems. \ 0. \/ 1 ^ 0 0 0 0 01 Ac )UBU= 3 k Fig. 192. The different branches of a polyphase system may be eitherindependent from each other, that is, without any electrical inter-connection, or they may be interlinked with each other. In thefirst case the polyphase system is called an independent system,in the latter case an interlinked system. The three-phase system with star-connected or ring-connectedgenerator, as shown diagrammatically in Figs. 192 and 193, is aninterlinked Fig. 193. The four-phase system as derived by connecting four equi-distant points of a continuous-current armature with fourcollector rings, as shown diagrammatically in Fig. 194, is aninterlinked system also. The four-wire, quarter-phase systemproduced by a generator with two independent armature coils, orby two single-phase generators rigidly connected with each otherin quadrature, is an independent system. As interlinked system,it is shown in Fig. 195, as star-connected, four-phase system. 398 ALTERNATING-CURRENT PHENOMENA 268. Thus, polyphase systems can be subdivided into:Symmetrical systems and unsymmetrical systems and unbalanced systems and independent only polyphase systems which have found practical appli-cation are: -E 2 \ ^+E 1 .-fS 3 ^^ 4 Fig. 194. The three-phase system, consisting of three displacedby one-third of a period, is used exclusively as interlinke
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