Power distribution - Per unit question problem

[JJ91]

Hi,

exam question:

My doubts start where it comes up with: S=75(0.8-j0.6) and Vr = 0.97 p.u.

Its easy to determine that 75 comes from 60/0.8, but where is the part in the brackets coming from ?

Also how was the 0.97 determined ?

Thanks in advance.

 

[jim hardy]

does not PF of 0.8 dictate a 3::4::5 triangle? (0.6::0.8::1.0) ? that's the bracketed part.

and 32/33 = .97?

remember it's per unit - everything a fraction of nominal.

 

[JJ91]

This must be way he did it, Thanks.