A $240-$km$,230-$kV$,60-$Hz$,1,000-$MVA $($three$-$phase$)$ line has a positive$-$sequence series impedance

z $=0\mathrm{.}13+$ j$0\mathrm{.}50/$km

and a positive$-$sequence shunt admittance

y $=$ j$3\mathrm{.}33106$ S$/$km$.$

At full load, the line delivers $250$ MW at $0\mathrm{.}99$ p$.$f$.$ lagging and at $220$ kV$.$ Using the nominal $$ circuit, calculate the following.

$($a$)$

Calculate the per$-$unit ABCD parameters. $($Enter your answers in polar form. Enter the phase angles in degrees. If a parameter equals zero, enter zero for both the magnitude and phase angle.$)$

A$=$ puB$=$ puC$=$ puD$=$ pu

$($b$)$

Calculate the per$-$unit sending$-$end voltage $($line$-$to$-$line$)$ and current. $($Enter the magnitudes.$)$

sending$-$end voltage pusending$-$end current pu

$($c$)$

Calculate the percent voltage regulation.

$\%$