GENERAL ALTERNATING CURRENT TRANSFORMER. ' 



It is of extreme importance for us to clearly understand these rela- 

 tions as they form the basis for all further reasoning. 



5. In Fig. 3 O A is the vector of the magnetomotive force.of the pri- 

 mary, or, in other words, the total number of lines of force (not in- 

 duction) produced by the primary current, and corresponding to the 

 number of ampere-turns. Not all the lines of induction which the pri- 

 mary current generates can reach the secondary of the transformer. 



FIG. 3. 



h .i 1 i 



Let us assume that the amount A A 1 is lost, OA* being equal to 

 Vi . O A, Vi being a factor smaller than one and measuring the loss of 

 lines from the primary to the secondary. Let OB 1 represent the vector 

 of the total number of lines of induction of the secondary, and O B = 

 v t . O B 1 the number of lines that extend into the primary, v t being 

 again a coefficient smaller than one, then we see at once that the vec- 

 tor sum of A and O B must be equal to the vector of the magneto 



