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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/EX5.7/Ex5_7.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
| download | Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.gz Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.bz2 Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.zip | |
initial commit / add all books
Diffstat (limited to '3760/CH5/EX5.7/Ex5_7.sce')
| -rw-r--r-- | 3760/CH5/EX5.7/Ex5_7.sce | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/3760/CH5/EX5.7/Ex5_7.sce b/3760/CH5/EX5.7/Ex5_7.sce new file mode 100644 index 000000000..d74e6e665 --- /dev/null +++ b/3760/CH5/EX5.7/Ex5_7.sce @@ -0,0 +1,16 @@ +clc;
+v=2300; // rated voltage of motor
+xs=12 ; // per phase synchronous reactance
+p=200000; // VA rating of motor
+l1=120000; // initial load
+l2=60000; // final load
+vt=v/sqrt(3); // rated per phase voltage
+ia=l1/(3*vt); // minimum armature current
+ia1=1.5*ia; // armature current at reduced load (50% increment)
+pf=1/1.5; // power factor
+Ef=sqrt((vt*pf)^2+(vt*sqrt(1-pf^2)+ia1*xs)^2); // excitation EMF
+de=asind((l2*xs)/(3*vt*Ef)); // new load angle
+ia2=(sqrt(vt^2+Ef^2-2*Ef*vt*cosd(de)))/xs; // new armature current
+printf('New value of armature current is %f A\n',ia2);
+pfn=l2/(3*vt*ia2);
+printf('Power factor at new armature current is %f leading',pfn);
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