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// Example 4.4
// Determine (a) Total three phase apparent power crossing the air gap
// (b) Active and reactive components (c) Rotor power factor
// Page No. 149
clc;
clear;
close;
// Given data
Ebr=150; // Blocked rotor voltage per phase
Ir_Mag=44.421; // Rotor current magnitude
Ir_Ang=-9.2; // Rotor current angle
Ir_magConj=9.2;
// (a) Total three phase apparent power crossing the air gap
Sgap_Mag=3*Ebr*Ir_Mag; // Apparent power crossing the air gap magnitude
Sgap_Ang=Ir_magConj; // Apparent power crossing the air gap angle
// Polar to Complex form
Sgap_R=Sgap_Mag*cos(-Sgap_Ang*%pi/180); // Real part of complex number
Sgap_I=Sgap_Mag*sin(Sgap_Ang*%pi/180); //Imaginary part of complex number
Sgap=ceil(Sgap_R)+%i*ceil(Sgap_I);
// (b) Active and reactive components
Pgap=Sgap_R; // Active power component
Qgap=Sgap_I; // Reactive power component
// (c) Rotor power factor
FP=cosd(Ir_magConj);
// Display result on command window
printf("\n Total three phase apparent power crossing the air gap (VA) =");
disp(Sgap);
printf("\n Active power component = %0.0f W",Pgap);
printf("\n Reactive power component = %0.0f var ",Qgap);
printf("\n Rotor power factor = %0.2f ",FP);
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