210 



COMMERCIAL ELECTRICAL TESTING 



lators to produce full load current in the secondary 

 winding. 



In pumping back against a bank of transformers, the 

 same general method is used. The ratio of transforma- 



tion of the transformers should be about equal to that of 

 the regulator. The same readings of temperature should 

 be taken as on a transformer using a similar method of 

 cooling. Carefully observe if there is any noise while 



