Alternate Current Transformer. 



23 



25. The method by which magnetic leakage has been dealt 

 with in the preceding theory is not applicable to open circuit 

 transformers. It will be seen in Section III. that this method 

 depends on the fact that in closed circuit transformers the vector 

 '^iC'i + w-zCa which represents the magnetizing ampere turns is 

 small compared with either n^Ci or ti^C^, throughout the greater 

 portion of the working range ; or, differently stated, that Cj and 

 C.2 are practically in opposition in phase, and that WiCj — //.^C.^ is 

 small relatively to either n-^C^ or //.^Cj from a small fraction of 

 full load onwards, in closed-circuit transformers. 



