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diff --git a/147/CH13/EX13.15/Example13_15.sce b/147/CH13/EX13.15/Example13_15.sce
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+close();
+clear;
+clc;
+//rated power 'Pr'
+Pr = 100*1000; //VA
+V1 = 11000; //V
+V2 = 2300; //V
+f = 60; //Hz
+
+//(a)
+//load on open-delta 'Pl'
+Pl = sqrt(3)*Pr; //VA
+mprintf("(a) Total load that can be supplied = %0.1f kVA\n\n",Pl/1000);
+//(b)
+Pr = 120*1000; //VA
+Iab = 1/3 * (Pr/V2);
+//from phasor diagram 
+Ia = (sqrt(3)*Iab);
+//transformation ratio 'a'
+a = V1/V2;
+//current in V1 winding 'Iline'
+Iline = Ia/a; //A
+mprintf("(b) Line current on high-voltage side, Iline = %0.1f A",Iline);