12 



CONSTANT-VOLTAGE TRANSMISSION 



greater heating. At leading power-factor, the heating 

 for a certain current is greater than at lagging power- 

 factor, due to the extra field current flowing in the motor. 



50 



100 

 Field Amperes 



150 



FIG. 2. " V " Curves of a Synchronous Motor. 



The property of synchronous motors of operating at 

 leading power-factor with a strong field current is a val- 

 uable one and is very generally recognized. In taking 

 advantage of it, the motor field current is generally left 



