example10.5   
i1+i3=1pu
v1=1.096+0.296p.u
v2=1.102+0.336p.u
p1=0.877p.u
p2=1.102p.u
cos(ph1)=0.965
cos(ph2)=0.957
b11=0.05827p.u
b22=0.05764p.u
b12=0.03312p.u
pl=0.178800p.u