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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 9 : SYNCHRONOUS GENERATOR
// Example : 9.11
clc;clear; // clears the console and command history
// Given data
kVA = 25 // kVA ratings
V = 440 // suppy voltage in V
f = 50 // supply frequency in Hz
pf = 0.8 // lagging power factor
R_a = 0.3 // resistance of machine per phase in ohm
X_d = 5 // reactance of machine per phase in ohm
X_q = 3 // reactance of machine per phase in ohm
// caclulations
phi = acosd(pf)
V_t = V/sqrt(3) // terminal voltage per phase in V
I_a = 25*10^3/(sqrt(3)*V) // armature current
delta = atand(I_a*X_q*pf/(V_t+I_a*X_q*sind(phi))) // torque angle
I_d = I_a*sind(delta+phi) // direct axis component of the current in A
E_f = V_t*cosd(delta)+I_d*X_d // induced voltage per phase in V
VR = ((E_f-V_t)/V_t)*100 // voltage regulation in V
// display the result
disp("Example 9.11 solution");
printf(" \n Torque angle \n delta = %.2f degree \n", delta );
printf(" \n Induced voltage per phase \n E_f = %.2f V \n", E_f );
printf(" \n Voltage regulation \n VR = %.2f percent \n", VR );
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