156 THE DESIGN OF STATIC TRANSFOiniKllS 



types of forced -cooled transformers came into extensive use* 

 These may be designated Air-Blast Transformers, Forced - 



FIG. 90. Coils of a shell-type air-blast transformer after completion of 



impreirnat inir process. 



Water-Cooled Oil Transformers and Forced-Oil-Cooled 

 Transformers. 



Air-Blast Transformers. A typical design for a shell-type! 

 air-blast transformer is indicated in Fig. 89. A view of the 



