2 files changed, 26 insertions, 0 deletions
diff --git a/431/CH3/EX3.28/EX3_28.sce b/431/CH3/EX3.28/EX3_28.sce
new file mode 100755
index 000000000..9b2675bd1
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+++ b/431/CH3/EX3.28/EX3_28.sce
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+//Calculate efficiency of transformer //Chapter 3
+//Example 3.29
+//page 236
+clear;
+clc;
+disp("Example 3.29")
+kVA=50;                    //rating of the transformers
+I1=250;                    //primary current in amperes
+Re=0.006;                  //total resistance referred to the primary side
+ironloss=200;                //iron loss in watt
+Culoss=(I1^2*Re);           //copper loss in watt
+pf=0.8;                      //power factor lagging
+printf("Full-load copper loss=%fW",Culoss);
+TL1=((Culoss+ironloss)/1000);         
+printf("\nTotal loss on full load=%fkW",TL1);
+TL2=((((Culoss*(1/2)^2))+ironloss)/1000)
+printf("\nTotal loss on half load=%fkW",TL2);
+effi1=(kVA*pf*100)/((kVA*pf)+TL1);
+printf("\nEfficiency at full load,0.8 power factor lagging=%f percent",effi1)
+effi2=((kVA/2)*pf*100)/(((kVA/2)*pf)+TL2);
+printf("\nEfficiency at half load,0.8 power factor lagging=%f percent",effi2)
+
diff --git a/431/CH3/EX3.28/resultEX3_28.txt b/431/CH3/EX3.28/resultEX3_28.txt
new file mode 100755
index 000000000..00433b7f0
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+ Example 3.28   
+
+All-day efficiency of transformer A=95.522388percent
+All-day efficiency of transformer B=96.822995percent 
+\ No newline at end of file