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author | priyanka | 2015-06-24 15:03:17 +0530 |
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committer | priyanka | 2015-06-24 15:03:17 +0530 |
commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
tree | ab291cffc65280e58ac82470ba63fbcca7805165 /20/CH2/EX2.3.69 | |
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initial commit / add all books
Diffstat (limited to '20/CH2/EX2.3.69')
-rwxr-xr-x | 20/CH2/EX2.3.69/example2_3_pg69.sce | 69 | ||||
-rwxr-xr-x | 20/CH2/EX2.3.69/example2_3_pg69.txt | 7 |
2 files changed, 76 insertions, 0 deletions
diff --git a/20/CH2/EX2.3.69/example2_3_pg69.sce b/20/CH2/EX2.3.69/example2_3_pg69.sce new file mode 100755 index 000000000..145287625 --- /dev/null +++ b/20/CH2/EX2.3.69/example2_3_pg69.sce @@ -0,0 +1,69 @@ +// 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); |