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authorpriyanka2015-06-24 15:03:17 +0530
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+// Example2_3_pg69.sce
+// To find primary voltage and current supplied
+// Theory of Alternating Current Machinery by Alexander Langsdorf
+// First Edition 1999, Thirty Second reprint
+// Tata McGraw Hill Publishing Company
+// Example in Page 69
+
+
+clear; clc; close;
+
+// Given data
+
+// Transformer A data
+va_A = 100e+3; // VA rating of Transformer
+v1_A = 4600; // Voltage in volts
+v2_A = 230; // Voltage in volts
+x_A = 0.027; // Reactance in Ohms
+r_A = 0.008; // Resistance in Ohms
+
+// Transformer B data
+va_B = 200e+3; // VA rating of Transformer
+v1_B = 4610; // Voltage in volts
+v2_B = 225; // Voltage in volts
+x_B = 0.013; // Reactance in ohms
+r_B = 0.003; // Resistance in ohms
+
+// Common Data
+P_load = 150e+3; // Power in Watts
+pf = +0.85; // + denotes lagging power factor
+vg = 225; // Voltage in volts
+
+
+// Calculations
+
+// Transformer A
+a_1 = v1_A / v2_A;
+z_1 = r_A + x_A*%i;
+y_1 = 1 / z_1;
+y_1_HVside = y_1 / a_1;
+
+// Transformer B
+a_2 = v1_B / v2_B;
+z_2 = r_B + x_B*%i;
+y_2 = 1 / z_2;
+y_2_HVside = y_2 / a_2;
+
+y_K = y_1 + y_2;
+y_K_HVside = y_1_HVside + y_2_HVside;
+
+// To find the current
+I = P_load / (vg * pf) ;
+V2_vec = vg;
+theta = acos(0.85);
+I_vec = I*(cos(theta) - sin(theta)*%i); // - sign indicates I lags V
+
+V1_vec = ((V2_vec * y_K) + I_vec) / (y_K_HVside) ;
+
+I1_vec = (I_vec + V1_vec*((y_K / a_1) - y_K_HVside)) / (z_1 * y_K );
+
+I2_vec = I_vec - I1_vec;
+
+printf(' Primary Voltage of transformer = %f /_ %f Volts\n', abs(V1_vec), (atan((imag(V1_vec))/(real(V1_vec))))*180/%pi);
+printf(' Current Supplied by transformer A = %f /_ %f Volts\n', abs(I1_vec), (atan((imag(I1_vec))/(real(I1_vec))))*180/%pi);
+printf(' Current Supplied by transformer B = %f /_ %f Volts\n', abs(I2_vec), (atan((imag(I2_vec))/(real(I2_vec))))*180/%pi);
+
+// Result
+// Primary Voltage of transformer = 4678.867698 /_ 1.211839 Volts
+// Current Supplied by transformer A = 361.324403 /_ -44.400715 Volts
+// Current Supplied by transformer B = 438.858386 /_ -21.431553 Volts
diff --git a/20/CH2/EX2.3.69/example2_3_pg69.txt b/20/CH2/EX2.3.69/example2_3_pg69.txt
new file mode 100755
index 000000000..08539daf4
--- /dev/null
+++ b/20/CH2/EX2.3.69/example2_3_pg69.txt
@@ -0,0 +1,7 @@
+
+-->exec('/home/octav/Techpassion_project_updated_19_June/Codes/Chapter_2/code/example2_3_pg69.sce', -1)
+ Primary Voltage of transformer = 4678.867698 /_ 1.211839 Volts
+ Current Supplied by transformer A = 361.324403 /_ -44.400715 Volts
+ Current Supplied by transformer B = 438.858386 /_ -21.431553 Volts
+
+-->diary(0);