diff options
Diffstat (limited to '3760/CH5/EX5.47/Ex5_47.sce')
| -rw-r--r-- | 3760/CH5/EX5.47/Ex5_47.sce | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/3760/CH5/EX5.47/Ex5_47.sce b/3760/CH5/EX5.47/Ex5_47.sce new file mode 100644 index 000000000..4665a68f7 --- /dev/null +++ b/3760/CH5/EX5.47/Ex5_47.sce @@ -0,0 +1,24 @@ +clc;
+l0=300; // total load on factory
+pf=0.6; // lagging power factor
+n=88; // percentage efficiency of motor
+pfn=0.9; // desired power factor
+l1=60; // mechanical load to be supplied
+// from phasor diagram 5.108
+pi=l1/(n/100); // synchronous motor input
+lt=pi+l0; // combined load
+disp('case a');
+k=lt/pfn;
+printf('Total load is %f KVA\n',k);
+disp('case b');
+a1=acosd(pf); // phase angle between terminal voltage and armature current
+a2=acosd(pfn); // phase angle corresponding to desired power factor
+k1=l0*tand(a1); // KVAr of load
+k2=lt*tand(a2); // combined KVAr
+s=k1-k2; // leading KVAr supplied by synchronous motor
+r=sqrt(s^2+pi^2);
+printf('Capacity of synchronous motor is %f KVA\n',r);
+disp('case c');
+pfs=pi/r;
+printf('Synchronous motor operating power factor is %f leading',pfs);
+
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