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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 /3574/CH5/EX5.16/EX5_16.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3574/CH5/EX5.16/EX5_16.sce')
| -rw-r--r-- | 3574/CH5/EX5.16/EX5_16.sce | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/3574/CH5/EX5.16/EX5_16.sce b/3574/CH5/EX5.16/EX5_16.sce new file mode 100644 index 000000000..40f81e3ef --- /dev/null +++ b/3574/CH5/EX5.16/EX5_16.sce @@ -0,0 +1,65 @@ +// Example 5.16
+// Determine (a) R1, R2, X1, X2, XM and the combined core, friction and windage
+// loss (b) Express the no-load current as a percent of rated current
+// Page No. 218
+
+clc;
+clear;
+close;
+
+// Given data
+P3ph=2573.4; // 3-ph power of induction motor
+Vline=36.2; // Line voltage
+Iline=58; // Line current
+P3phnl=4664.4; // No load power
+Vlinenl=460; // No load line volatge
+Ilinenl=32.7; // No load line current
+Vdc=12; // DC voltage
+Idc=59; // DC current
+F1=60; // Rated frequency
+F2=15; // Test frequency
+Irated=57.8; // Rated current
+
+// (a) R1, R2, X1, X2, XM and the combined core, friction and windage loss
+Pbr15=P3ph/3; // Power/phase
+Vbr15=Vline/sqrt(3); // Voltage/phase
+Ibr15=Iline;
+PNL=P3phnl/3; // No load power/phase
+VNL=Vlinenl/sqrt(3); // No load voltage/phase
+INL=Ilinenl; // No load current/phase
+
+// Determination of R1
+Rdc=Vdc/Idc;
+R1=Rdc/2;
+
+// Determination of R2
+Zbr15=Vbr15/Ibr15; // Impedance
+Rbr15=Pbr15/Ibr15^2;
+R2=Rbr15-R1;
+
+// Determination of X1 and X2
+Xbr15=sqrt(Zbr15^2-Rbr15^2);
+Xbr60=Xbr15*(F1/F2);
+X1=0.4*Xbr60; // From Table 5.10
+X2=0.6*Xbr60;
+
+// Determination of XM
+SNL=VNL*INL;
+QNL=sqrt(SNL^2-PNL^2);
+XNL=QNL/INL^2;
+XM=XNL-X1;
+
+// Determination of combined friction, windage and core loss
+Ploss=PNL-(INL^2*R1);
+
+// (b) No-load current as a percent of rated current
+PerINL=INL*100/Irated;
+
+// Display result on command window
+printf("\n Motor resistance 1 = %0.3f Ohm/phase",R1);
+printf("\n Motor reactance 1 = %0.4f Ohm/phase",X1);
+printf("\n Motor resistance 2 = %0.3f Ohm/phase",R2);
+printf("\n Motor reactance 2 = %0.4f Ohm/phase",X2);
+printf("\n Reactance of motor = %0.2f Ohm/phase",XM);
+printf("\n Combined friction, windage and core loss = %0.0f W/phase",Ploss);
+printf("\n No-load current as a percent of rated current = %0.1f Percent",PerINL);
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