1 files changed, 54 insertions, 0 deletions
diff --git a/Working_Examples/2777/CH3/EX3.21/Ex3_21.sce b/Working_Examples/2777/CH3/EX3.21/Ex3_21.sce
new file mode 100755
index 0000000..807aae2
--- /dev/null
+++ b/Working_Examples/2777/CH3/EX3.21/Ex3_21.sce
@@ -0,0 +1,54 @@
+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD
+
+// CHAPTER : 3 : TRANSFORMERS 
+
+// EXAMPLE : 3.21
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+// Refer figures 3.31(a), 3.31(b) and 3.31(c):- Page no. 121
+
+VaH = 220;                   // HV side Voltage of the two winding Transformer in volts for case(a)
+VaL = 110;                   // LV side Voltage of the two winding Transformer in volts for case(a)
+VbH = 330;                   // HV side Voltage of the two winding Transformer in volts for case(b)
+VbL = 220;                    // LV side Voltage of the two winding Transformer in volts for case(b)
+VcH = 330;                    // HV side Voltage of the two winding Transformer in volts for case(c) 
+VcL = 110;                    // LV side Voltage of the two winding Transformer in volts for case(c)
+S = 1.5;                      // Ratings of the the two winding Transformer in kVA
+I1 = 6.8;                     // Rated current in HV side in Amphere 
+I2 = 13.6;                    // Rated current in LV side in Amphere 
+
+
+// CALCULATIONS
+// for case(a):- figure 3.31(b) page no. 121
+
+IbH = I2;                        // Current of Auto-Transformer in HV side in Amphere
+IbL = I1 + I2;                   // Current of Auto-Transformer in LV side in Amphere
+KVA_b_L = (VbL*IbL)/1000;        // LV side kVA rating of the Auto-Transformer in kVA
+KVA_b_H = (VbH*IbH)/1000;        // HV side kVA rating of the Auto-Transformer in kVA
+
+// for case(b):- figure 3.31(c) page no. 121
+
+IcH = I1;                         // Current of Auto-Transformer in HV side in Amphere
+IcL = I1 + I2;                    // Current of Auto-Transformer in LV side in Amphere
+KVA_c_L = (VcL*IcL)/1000;         // LV side kVA rating of the Auto-Transformer in kVA
+KVA_c_H = (VcH*IcH)/1000;         // HV side kVA rating of the Auto-Transformer in kVA
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 3.21 : SOLUTION :-") ;
+printf("\n (a.1) Current of Auto-Transformer in HV side for case (b) , IH = %.1f A \n ",IbH);
+printf("\n       Current of Auto-Transformer in LV side for case (b), IL= % .1f A \n",IbL);
+printf("\n (a.2) LV side kVA rating of the Auto-Transformer for case (b), KVAL = % .3f kVA \n ",KVA_b_L);
+printf("\n       HV side kVA rating of the Auto-Transformer for case (b), KVAH= % .3f kVA \n",KVA_b_H);
+printf("\n (b.1) Current of Auto-Transformer in HV side for case (c) , IH = %.1f A \n ",IcH);
+printf("\n       Current of Auto-Transformer in LV side for case (c) , IL= % .1f A \n",IcL);
+printf("\n (b.2) LV side kVA rating of the Auto-Transformer for case (c), KVAL = % .3f kVA \n ",KVA_c_L);
+printf("\n       HV side kVA rating of the Auto-Transformer for case (c) , KVAH= % .3f kVA \n",KVA_c_H);