)ETAILED STUDY OF OPERATION WITH NORMAL LOAD 83 



The saving in loss by resistance-heating in the generators (which 

 proportional to the square of the current), is 



>.o4Ei/ w ( -s-7 - 1 ) X h. 



\cos 2 / 



Finally, we will assume the efficiency of the synchronous motors 

 to be 8 per cent lower than that of induction-motors, which is rather 



Cos<p 



FIG. 39. 



exaggerated, because synchronous motors are actually constructed 

 whose efficiency approaches that of induction-motors. We will 

 assume, however, that the efficiency is lower, in order to justify the 

 assumption of equality of cost per k.w. for the two classes of motors. 

 The increase in annual cost of the energy expended in the synchro- 

 nous motors, resulting from that difference in the efficiency, would be 



IOOO 



XA, 



