GENERAL ALTERNATING CURRENT TRANSFORMER. 



The smallest lag <P is determined by the intersection of the semi- 

 circle LD with the semi-circle HAO, as can be seen at a glance. The 

 cosine of this angle can be expressed as follows. It is 



HA =HD =-^>-, 



20 



cos <t> = 



HA 



HO 



OO 



= (T 



20 I I + 



. - 



(3)- 



20+1 



This equation enables us to predict the maximum power factor if 

 the leakage coefficient a is known. I will here premise that the start- 

 ing current furnishes a value for the determination of the diameter of 



8 8 



FIG. 6. 



the semi-circle, while the magnetizing current can always easily be 

 measured. This method of determining the maximum power factor 



