1 files changed, 17 insertions, 0 deletions
diff --git a/3760/CH5/EX5.58/Ex5_58.sce b/3760/CH5/EX5.58/Ex5_58.sce
new file mode 100644
index 000000000..70efa2c40
--- /dev/null
+++ b/3760/CH5/EX5.58/Ex5_58.sce
@@ -0,0 +1,17 @@
+clc;
+p=3*10^6; // rated power of alternator
+v=11000; // rated voltage of alternator
+r=0.4; // per phase effective resistance
+vl=12370; // line to line voltage at zero leading power factor
+i=100; // load current at zero power factor  
+pf=0.8; // lagging power factor at which voltage regulation has to be determined
+vt=vl/sqrt(3); // per phase terminal voltage
+Ef=v/sqrt(3); // per phase excitation EMF
+ia=p/(sqrt(3)*v); // full load phase current
+// for zero power factor load angle=0
+zs=(vt-Ef)/i; // synchronous impedance
+xs=sqrt(zs^2-r^2); // synchronous reactance
+// From phasor diagram
+Ef1=sqrt((Ef*pf+ia*r)^2+(Ef*sqrt(1-pf^2)+ia*xs)^2); // excitation EMF at 0.8 power factor
+vr=((Ef1-Ef)/Ef)*100; 
+printf('Voltage regulation at %f lagging power factor is %f percent',pf,vr);