420 



ELECTRICAL EQUIPMENT 



voltage neutrals must not be connected together. Where the 

 high-voltage windings are Y-connected the danger of Y-Y oper- 

 ation should be considered, and the neutral should be grounded. 



a b c d e f 



1234 5 



Collector Rings 



FIG. 264. 



23456 



Collector Rings 



FIG. 265. 



a,T 



T 



The current in each leg is equal to /= output in watts 



Y voltage X 1.73X2 

 the line current has the same value. 



Double-T. Fig. 265 represents the double-T connection for 

 transforming from three-phase to six-phase. The low-voltage 

 connections are similar to the two-phase six-phase system shown 

 in Fig. 255, and the high-voltage windings are connected in T. 



