example 14.16   
 
 (a)   
vn=0.853.p.u 
 vn=112.628kV 
 (b)   
vn=1.021.p.u 
 vn=134.772kV
 transformation ratio under load condition 3.413 
 transformation ratio under no load condition 4.084 
 the actual ratio can be taken as mean of the above value i.e.3.748percent
 varying by (+/-)0.336percent