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+//To determine the substation parameters for various Load densities

+//Page 208

+clc;

+clear;

+

+D=[500,500,2000,2000,10000,10000,2000,2000]; //Load Densities in kVA/sq.miles

+TAn=[6,6,3,3,1,1,15,15]; //Substation Area in sq.miles

+VD=[3,6,3,6,3,6,3,6]; //Maximum Total Primary Feeder Voltage drops in percentage

+Vll=[4.16,4.16,4.16,4.16,4.16,4.16,13.2,13.2]; //Base Feeder Voltage in kV

+

+TSn=D.*TAn; //Susbstation Load

+//From the Graphs of feeders vs load desity in the textbook; The Number of feeders are found to be

+

+n=[4,2,5,3,5,4,6,5]; //No of feeders

+

+//Also from the graph, The characteristic or the feeder is determined

+//1-5, 7 are VDL feeders

+//6 and 8 are TL feeders

+

+Sn=TSn./n; //Load Per Feeder

+//To Determine the Load Current

+Il=Sn./(sqrt(3).*Vll); 

+

+printf('\na)')

+printf('\nThe Substation Size is\n')

+disp(TSn)

+printf('\nThe Number of Feeders from the Curve is\n')

+disp(n)

+printf('\nAlso From the Curve, 1,2,3,4,5,7 cases are VDL but 6 and 8 case are TL\n')

+printf('\na)')

+printf('\nThe Load Current for 6th Case is %g A, which is less than the ampacities of the main but \nmore than that of the lateral, Hence it is thermally limited but not the main feeder\n',Il(6))

+printf('\nThe Load Current for 8th Case is %g A, which is less than the ampacities of the main but \nmore than that of the lateral, Hence it is thermally limited but not the main feeder\n',Il(8))