THE POLYPHASE CIRCUIT. 



301 



E = 



E 



cos 30 ' 2 - 2 V "3" 

 t.e., the voltage measured from .4 to B in Fig. 147 is equal 

 to \/~3, or 1'73 times the voltage generated in a single 

 coil, such as A, of the alternator. 



Stated generally, in a star-connected alternator, the 

 terminal voltage = voltage of one phase x y' 3 . Evi- 

 dently from the diagram the current supplied to any 



FIG. 149. 



FIG. 150. 



RESULTANT VOLTAGE OF Two COILS OF STAR-CONNECTED GENERATOR IN 

 3-PHASE TRANSMISSION. 



circuit is the same as the current in each winding of the 

 armature. 



(2) Suppose the same windings to be connected in 

 mesh, as shown in Fig. 148. 



The voltage between any pair of conductors A 1 A, 

 B 1 B, &c., is in this case the same as that produced in the 

 phase winding between them, since they are connected 

 directly to the ends of the winding. 



