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//Book - Power System: Analysis & Design 5th Edition
//Authors - J. Duncan Glover, Mulukutla S. Sarma, and Thomas J. Overbye
//Chapter - 14 ; Example 14.1
//Scilab Version - 6.0.0 ; OS - Windows
clc;
clear;
Vdelpri=230; //The rated RMS line voltage of the primary winding in kV
Vwyesec=34.5; //The rated RMS line voltage of the secondary winding in kV
MVAoa=75; //The MVA OA rating of the transformer
MVAfa=100; //The MVA FA rating of the transformer
MVAfoa=133; //The MVA FOA rating of the transformer
Zpu=0.07; //The percentage impedance of the transformer in terms of MVA OA ratings
MVAbase=100; //The MVA base in MVA
kVbase=34.5; //The KV base in kV
Ioa=(MVAoa/3)/(Vwyesec/sqrt(3)); //The OA transformer current in the low voltage side in kA
Ifa=(MVAfa/3)/(Vwyesec/sqrt(3)); //The FA transformer current in the low voltage side in kA
Ifoa=(MVAfoa/3)/(Vwyesec/sqrt(3)); //The FOA transformer current in the low voltage side in kA
Zbasepu=Zpu*MVAbase/MVAoa; //The per unit impedance of the system in ohm pu
Isc3ph=(1/Zpu)*Ioa; //The transformer current during three phase bolted faultin kA
printf('\nThe OA transformer current in the low voltage side is %f kA',Ioa);
printf('\nThe FA transformer current in the low voltage side is %f kA\n',Ifa);
printf('The FOA transformer current in the low voltage side is %f kA\n',Ifoa);
printf('The per unit impedance of the system is %f pu\n',Zbasepu);
printf('The transformer current during three phase bolted fault is %f kA',Isc3ph);
//The answer in the book is not correct. Eg.75/(sqrt(3)*34.5)---Actual result is 1.255, but it is given as 7.372 in the book.
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