A $200-$km$,230-$kV$,60-$Hz three$-$phase line has a positive$-$sequence series impedance

and a positive$-$sequence shunt admittance$=0.08+0.48/$

$.$ At full load, the line delivers $250$ MW at $0\mathrm{.}99$ p$.$f$.$ lagging$=3.33106/$

and at $220$ kV$.$ Using the nominal circuit, calculate

a$)$ The ABCD parameters

b$)$ The sending$-$end voltage and current

c$)$ The percent voltage regulation