From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

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 3872/CH9/EX9.3/Ex9_3.sce | 37 +++++++++++++++++++++++++++++++++++++
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+//Book - Power system: Analysisi & Design 5th Edition
+//Authors - J. Duncan Glover, Mulukutla S. Sarma, and Thomas J.Overbye
+//Chapter-9 ;Example 9.3
+//Scilab Version - 6.0.0; OS - Windows
+
+clc;
+clear;
+
+Xn=0.05                         //motor neutral is grounded through reactance in per unit
+Sb=100                          //Base value of system in MVA
+Vb=13.8                         //Base voltage of system in kV
+Vf=1.05                         //Prefault voltage in per unit
+Z0=%i*0.250                     //Zero sequence impedance in per unit
+Z1=%i*0.13893                   //Positive sequence impedance in per unit
+Z2=%i*0.14562                   //Negative sequence impedance in per unit
+Zf=0                            //Fault through impedance in per unit
+
+If0=Vf/(Z0+Z1+Z2+(3*Zf))        //sequence line to ground fault current in per unit
+If1=If0;If2=If0;                // Since If0=If1=If2
+If=[If0;If1;If2]
+Isf=3*If0                       //subtransient fault current in per unit
+Ib2=Sb/(Vb*sqrt(3))             //base current at bus 2 in kA
+Ib22=Isf*Ib2
+Vsf=[0;Vf;0]-([Z0 0 0;0 Z1 0;0 0 Z2]*If)       //sequence componenets of the voltages at the fault in per unit
+a=exp(%i*(120)*(%pi/180));                     //operator a
+Vlg2=[1 1 1;1 (a^2) a;1 a (a^2)]*Vsf           //line to ground voltages at faulted bus 2 in per unit
+for i=1:3                            //This loop is included to avoid discrepancies in angle values when the voltage value is near to zero or zero
+    if abs(Vlg2(i))<1e-6             //For example, atand(0,0) gives 0 degree and atand(0,-0) gives 180 degree
+        Vlg2(i)=0;
+    end
+end                
+
+printf('The magnitude of subtransient at bus 2 in is %.4f kA and its angle is %.4f degrees\n',abs(Ib22),atand(imag(Ib22),real(Ib22)));
+disp(abs(Vlg2),'The magnitude of line to ground voltages at faulted bus 2 in per unit is:');
+disp(atand(imag(Vlg2),real(Vlg2)),'The angle of line to ground voltages at faulted bus 2 is :');
+
+
-- 
cgit