182 



COMMERCIAL ELECTRICAL TESTING 



Connect the secondary circuits of the two transformers 

 in multiple, and the primaries as shown in Fig. (H. 



Connect between A and A' and try the fuse wire from 

 B to B'\ if no spark is obtained, connect from B to B' , 



7o Three phase Alternator 8 



To Three phase 

 Alternator A 



Fig. 62 

 Connections for Heat Run, Three-Phase 



leaving the first connection, and try the fuse wire from 

 C to C*. If no spark results here, the parallel run is 

 satisfactory. The voltage must be taken off before any 

 connections are changed. 



Heat Run 



The method described for the three single-phase 

 transformers is the one ordinarily used. If two or more 

 transformers are to be run simultaneously, connect 

 the transformers in multiple on the secondary side and 

 the primaries all in series. The same general instructions 

 for the heating of single-phase transformers will apply; 

 in fact, each phase of a three-phase transformer must be 



