2 files changed, 50 insertions, 0 deletions
diff --git a/3574/CH2/EX2.12/EX2_12.png b/3574/CH2/EX2.12/EX2_12.png
new file mode 100644
index 000000000..ab6db02ff
--- /dev/null
+++ b/3574/CH2/EX2.12/EX2_12.png
diff --git a/3574/CH2/EX2.12/EX2_12.sce b/3574/CH2/EX2.12/EX2_12.sce
new file mode 100644
index 000000000..89039d460
--- /dev/null
+++ b/3574/CH2/EX2.12/EX2_12.sce
@@ -0,0 +1,50 @@
+// Example 2.12
+// Computation of (a) Core loss (b) Core loss if operated at rated current and
+// 0.860 power factor from 375V, 50 HZ supply (c) Efficiency for condition in (b)
+// (d) Efficiency if the load is disconnected
+// Page No. 72
+
+clc;
+clear;
+close;
+
+// Given data
+Srated=50000;              // Transformer power rating
+VHS=450;                   // High side voltage 
+RPU=0.0125;                // Percent resistance 
+XPU=0.0224;                // Percent reactance 
+FP=0.86;                   // Power factor lagging
+eta=0.965                  // Efficiency
+Hl=0.71                    // Hysteresis loss
+Vt60=375                   // Supply voltage
+f1=60;                     // Transformer frequency
+f2=50;                     // Supply frequency
+
+
+// (a) Core loss 
+IHS=Srated/VHS;
+// Using high-side values
+Req_HS=RPU*VHS/IHS;            // Equivalent high-side resistance
+Pout=Srated*FP;                // Output power
+Pin=Pout/eta;                  // Input power
+Pcore=Pin-Pout-(IHS^2*Req_HS)  // Core loss
+
+// (b) Core loss if operated at rated current and 0.860 power factor from 
+// 375V, 50 HZ supply
+Ph60=Hl*Pcore;              // Hysteresis loss
+Pe60=Pcore-Ph60;            // Eddy current loss
+Pe50=Pe60*(Vt60/VHS)^2;     // Eddy current loss
+Ph50=Ph60*(f2/f1)*(Vt60/VHS*f1/f2)^1.6; 
+Pcore50=Pe50+Ph50;          // Core loss
+
+// (c) Efficiency
+Pout=Vt60*IHS*FP;           // Output power
+etanew=Pout/(Pout+Pcore50+IHS^2*Req_HS);
+
+// (d) Efficiency with the load is disconnected
+
+// Display result on command window
+printf("\n Core loss = %0.1f W", Pcore);
+printf("\n Core loss at 375V, 50 Hz supply = %0.2f W",Pcore50);
+printf("\n Efficiency = %0.1f Percent", etanew*100);
+printf("\n Efficiency = 0 with the load is disconnected as Pout=0" )