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+//Exa 3.2

+clc;

+clear;

+close;

+//Given data :

+a=poly(0,'a');

+cost=90*a+20;//Rs./m

+i=10;//%(interest and depreciation)

+l=2;//km

+cost_E=4;//paise/unit

+Im=250;//A

+a=1;//cm^2

+rho_c=0.173;//ohm/km/cm^2

+l2=1*1000;//km

+R=rho_c*l/a;//ohm

+W=2*Im^2*R;//W

+Eloss=W/1000*365*24/2;//per annum(kWh)

+P3BYa=cost_E/100*Eloss;//Rs

+Cc=90*a*l*1000;//Rs(capital cost of feeder cable)

+P2a=Cc*i/100;//Rs

+//P2a=P3BYa;//For most economical cross section

+a=sqrt(P3BYa*a/(P2a/a));//cm^2

+disp(a,"Most economical cross sectional area in cm^2 : ");