PHASE CHARACTERISTIC 



55 



would be so large as to dangerously heat the machine 

 and the torque not sufficient to carry full load. 



All readings should be corrected for instrument 

 factors and shunt ratios, and a curve plotted between 

 amperes field as abscissae and amperes armature as 

 ordinates. See Table VI and Fig. 18. 



800 ^390 



700370 



600 



600 



^360 



300 



ZOO 



/OO 



Fig. 18. No Load and Full Load Phase Characteristics on a 300 Kw. 600 Volt 

 750 R.P.M., 25 Cycle, 3-Phase, Rotary Converter 



Synchronous and Static Impedance 



Synchronous impedance should be taken on alternating 

 current machines to determine the field current necessary 

 to produce a given armature current when the machine 

 is running short circuited. Since the regulation of the 

 machine is calculated from the impedance and saturation 



