102 THE DESIGN OF STATIC TRANSFORMERS 



secondary) the diagram will be modified, as shown in Fig. G0 ? 

 and we see that a primary pressure of 119 volts is necessary 



FIG. 60. Transformer diagram with 30 per cent, reactance drop and 15 percent. 

 / It drop. Power factor = unity. 



FIG. 61. Transformer diagram with 30 per cent, reactance drop and 15 JMT 

 cent. / Jl drop. Angle of lag <J> = 30. Cos </> . 0,880. 



in order that we may, at full load, obtain 100 volts at the 

 secondary terminals ; in other words, the pressure at the 

 secondary terminals will gradually fall from 119 volts at no load 

 to 100 volts at full load. 



