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// Example 12.2
// Computation of (a) No load voltage (b) Voltage regulation
// (c) Resistance setting of rheostat necessary to obtain rated voltage
// at rated conditions
// Page No. 487
clc;
clear;
close;
// Given data
P=300000; // Shunt generator power rating
VT=240; // Shunt generator voltage rating
Ra=0.00234; // Armature winding resistance
RIP=0.00080; // Resistance of interpole winding
Fnet=5100; // Net mmf
Vnl=255; // No load voltage
Vrated=240; // Rated voltage
Nf=1020; // Turns per pole
Vf=120; // Source that separately excites the generator
If=5.69;
Rf=18.1;
// (a) No load voltage
Ia=P/VT; // Armature current
Ea=VT+Ia*(Ra+RIP); // Armature emf
Ff=Fnet/(1-0.121);
// (b) Voltage regulation
VR=(Vnl-Vrated)*100/Vrated;
// (c) Resistance setting of rheostat necessary to obtain rated voltage at rated conditions
If=Ff/Nf;
Rrheo=(Vf/If)-Rf; // Rheostat setting
// Display result on command window
printf("\n No load voltage = %0.0f V ",Vnl);
printf("\n Voltage regulation = %0.2f Percent ",VR);
printf("\n Resistance setting of rheostat necessary = %0.0f Ohm",Rrheo);
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