GENERAL ALTERNATING CURRENT TRANSFORMER. 



13. We should make a great mistake were we to assume that this 

 value would give us a leakage factor a true to reality, since in our case, 

 where the slots in armature and field are closed, v depends greatly 

 upon the saturation of the thin iron bridges closing the slots. The 

 saturation of these bridges is dependent upon the intensity of the 



FIG. 5. 



current ; beyond a certain intensity v, and therefore a is practically 

 constant. Assuming z/j to be equal to v t , we should get for 



a = _ i = 0.235, instead of '-$ = 0.098, 

 0.90-0.00 1 68 



as follows from the diagram. 



14. It may be advisable to emphasize that in the derivation of the 

 diagram the ohmic resistance of the primary has not been taken into 

 account. As this point is of extreme theoretical and practical impor- 

 tance, we have to dwell on it at some length. 



THE INFLUENCE OF THE RESISTANCE OF THE PRIMARY UPON THE DIAGRAM. 



15. The semi-circle L i' 2' 3' 4' D, Fig. 5, represents the locus of the 

 current for a constant terminal voltage OE, upon the assumption that 

 the primary resistance be negligible. 'The arc I 2 3 4 is the locus of 



7 



