$[8$ marks$]$

$($b$)$ Consider the system shown in Figure Q$3($b$).$

$($i$)$ Draw the positive sequence, negative sequence and zero sequence diagrams for the power system.

$[4$ marks$]$

$($ii$)$ Connect the symmetrical components for line$-$to$-$line fault at point B$.$

$[2$ marks$]$

$($iii$)$ Connect the symmetrical components for a single line to ground fault at point B$.$

$[2$ marks$]$

Figure Q$3($b$)$