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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);