9-B] 



INDUCTION GENERATOR. 



303 



that, in order to give a frequency of 60 cycles, the machine to 

 which the curve refers must be driven at 1823 R.P.M., correspond- 

 ing to a negative slip of 1.3 per 

 cent, the synchronous speed 

 being 1800. 



22. Repeat with the con- 

 verter self excited. 



23. Load Test. Connect a 

 non-inductive load by closing jf. 

 S 3 . Compare the values of 

 / cos 9 and / sin 6 for the three 

 circuits. All the power, and 



hence all the nower current is FlG ' 5 ' Effect of chan s e of s P eed of 



5 induction generator operated with a 



derived from the induction synchronous converter; field current of 



converter constant, 1.4 amperes. 



generator, some of this being 



used in driving the converter and the remainder being supplied 



to the load. 



The wattless current, 7 sin 0, merely circulates between the two 

 machines, since the non-inductive load takes none of it. (This 

 test may be extended as desired.) 



