This is a Matlab Code to construct a Ybus matrix of power network using IEEE $14$ bus data. I NEED VERY DETAILED EXPLANATION AND REASONS FOR EACH LINE PLEASE!

$\%$IEEE $14$ Bus Test Case Data

Bus$\_$Data$=[111\mathrm{.}060000000$;

$231\mathrm{.}045\mathrm{.}217\mathrm{.}127\mathrm{.}400-\mathrm{.}4\mathrm{.}50$;

$331\mathrm{.}010\mathrm{.}942\mathrm{.}19000-\mathrm{.}0\mathrm{.}40$;

$421\mathrm{.}478-\mathrm{.}03900000$;

$521\mathrm{.}076\mathrm{.}01600000$;

$631\mathrm{.}07\mathrm{.}112\mathrm{.}07500-\mathrm{.}06\mathrm{.}240$;

$7210000000$;

$831\mathrm{.}090000-\mathrm{.}06\mathrm{.}240$;

$921\mathrm{.}295\mathrm{.}1660000\mathrm{.}19$;

$1021\mathrm{.}09\mathrm{.}05800000$;

$1121\mathrm{.}035\mathrm{.}01800000$;

$1221\mathrm{.}061\mathrm{.}01600000$;

$1321\mathrm{.}135\mathrm{.}05800000$;

$1421\mathrm{.}149\mathrm{.}0500000]$;

Brunch$\_$Data$=[112\mathrm{.}01938\mathrm{.}05917\mathrm{.}02641$;

$223\mathrm{.}04699\mathrm{.}19797\mathrm{.}02191$;

$324\mathrm{.}05811\mathrm{.}17632\mathrm{.}01871$;

$415\mathrm{.}05403\mathrm{.}22304\mathrm{.}02461$;

$525\mathrm{.}05695\mathrm{.}17388\mathrm{.}01701$;

$634\mathrm{.}06701\mathrm{.}17103\mathrm{.}01731$;

$745\mathrm{.}01335\mathrm{.}04211\mathrm{.}00641$;

$8560\mathrm{.}252020\mathrm{.}932$;

$9470\mathrm{.}209120\mathrm{.}978$;

$10780\mathrm{.}1761501$;

$11490\mathrm{.}556180\mathrm{.}969$;

$12790\mathrm{.}1100101$;

$13910\mathrm{.}03181\mathrm{.}0845001$;

$14611\mathrm{.}09498\mathrm{.}1989001$;

$15612\mathrm{.}12291\mathrm{.}2558101$;

$16613\mathrm{.}06615\mathrm{.}1302701$;

$17914\mathrm{.}12711\mathrm{.}2703801$;

$181011\mathrm{.}08205\mathrm{.}1920701$;

$191213\mathrm{.}22092\mathrm{.}1998801$;

$201314\mathrm{.}17093\mathrm{.}3480201]$;

$[$numBuses$,$ busColumns$]=$ size$($Bus$\_$Data$)$;

$[$numBrunch$,$ brunchColumns$]=$ size$($Brunch$\_$Data$)$;

Y$\_$bus $=$ zeros$($numBuses$,$ numBuses$)$;

for i $=1$:numBrunch

Bus$1=$ Brunch$\_$Data$($i$,2)$;

Bus$2=$ Brunch$\_$Data$($i$,3)$;

Ysh $=$ Brunch$\_$Data$($i$,6)$;

Ts $=$ Brunch$\_$Data$($i$,7)$;

Ts$2=$ Ts $*$ Ts;

Z $=$ Brunch$\_$Data$($i$,4)+1$i $*$ Brunch$\_$Data$($i$,5)$;

Y $=1/$ Z;

Y$\_$bus$($Bus$1,$ Bus$1)=$ Y$\_$bus$($Bus$1,$ Bus$1)+1$i $*$ Ysh $+(1/$ Ts$2)*$ Y;

Y$\_$bus$($Bus$2,$ Bus$2)=$ Y$\_$bus$($Bus$2,$ Bus$2)+1$i $*$ Ysh $+$ Y;

Y$\_$bus$($Bus$1,$ Bus$2)=$ Y$\_$bus$($Bus$1,$ Bus$2)-(1/$ Ts$)*$ Y;

Y$\_$bus$($Bus$2,$ Bus$1)=$ Y$\_$bus$($Bus$1,$ Bus$2)$;

end

$\%$Shunt capacitance :

for$($i$=1$:numBuses$)$

Y$\_$bus$($i$,$i$)=$Y$\_$bus$($i$,$i$)+1$i$*$Bus$\_$Data$($i$,10)$

end