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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3760/CH5/EX5.27/Ex5_27.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3760/CH5/EX5.27/Ex5_27.sce')
| -rw-r--r-- | 3760/CH5/EX5.27/Ex5_27.sce | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/3760/CH5/EX5.27/Ex5_27.sce b/3760/CH5/EX5.27/Ex5_27.sce new file mode 100644 index 000000000..1c51189a1 --- /dev/null +++ b/3760/CH5/EX5.27/Ex5_27.sce @@ -0,0 +1,25 @@ +clc;
+v=400; // rated voltage of synchronous machine
+vt=v/sqrt(3); // per phase rated voltage
+ps=9500; // shaft load
+xd=5; // per phase d-axis synchronous reactance
+xq=3.2; // per phase q-axis synchronous reactance
+l=500; // friction windage and core losses
+np=3; // number of phases
+// at rated voltage excitation EMF
+Ef=v/sqrt(3); // excitation EMF
+disp('case a');
+pt=ps+l; // power developed
+// by using formula pd=np*(((Ef*Ef*sind(de))/xd)+((Ef^2*sind(2*de)*0.5*(xd-xq))/(xd*xq))), and hit and trial method we obtain value of load angle
+de=11.623; // load angle
+id=(Ef-Ef*cosd(de))/xd; // d-axis component of armature current
+iq=(Ef*sind(de))/xq; // q-axis component of armature current
+ia=sqrt(id^2+iq^2);
+printf('Armature current is %f A\n',ia);
+pf=cosd(acosd(iq/ia)-de);
+printf('Power factor is %f lagging\n',pf);
+disp('case b');
+de=acosd((-Ef*xq)/(4*Ef*(xd-xq))+(sqrt(0.5+((Ef*xq)/(4*vt*(xd-xq)))^2)));
+pd=np*(((Ef*Ef*sind(de))/xd)+((Ef^2*sind(2*de)*0.5*(xd-xq))/(xd*xq))); // maximum power developed
+po=pd-l;
+printf('Maximum power output is %f W',po);
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