86 THE DESIGN OF STATIC TRANSFORMERS 



certain circumstances. On the whole, the progress at 

 present being made in the development of improved insulating 

 materials and methods is making it practicable to work with 



I 



\/0000 



6OOO 



200O 







/ 2 3 4 5 6 



Th/ckness 0f fnsu/jfoon /n ^////meters 



7 



FIG. 52. Curve showing thickness of insulation between primary and secuiulmv 

 windings of transformers. 



less thicknesses than the values corresponding to the curve in 

 Fig. 52. 



The primary winding is divided up into eight coils, four on 

 each leg, as seen in Figs. 49 and 51. Each coil is wound in 



