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Diffstat (limited to '3802/CH7/EX7.5')
| -rw-r--r-- | 3802/CH7/EX7.5/Ex7_5.jpg | bin | 0 -> 18023 bytes | |||
| -rw-r--r-- | 3802/CH7/EX7.5/Ex7_5.sce | 38 |
2 files changed, 38 insertions, 0 deletions
diff --git a/3802/CH7/EX7.5/Ex7_5.jpg b/3802/CH7/EX7.5/Ex7_5.jpg Binary files differnew file mode 100644 index 000000000..d09837ea3 --- /dev/null +++ b/3802/CH7/EX7.5/Ex7_5.jpg diff --git a/3802/CH7/EX7.5/Ex7_5.sce b/3802/CH7/EX7.5/Ex7_5.sce new file mode 100644 index 000000000..029151346 --- /dev/null +++ b/3802/CH7/EX7.5/Ex7_5.sce @@ -0,0 +1,38 @@ +//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex7_5.sce.
+
+clc;
+clear;
+P=500e3; //KVA rating of the transformer
+Vp=6600; //primary voltage in V
+Vs=440; //secondary voltage in V
+rp=0.45; //primary winding resistance in ohms
+rs=0.0015; //secondary winding resistance in ohms
+iron_loss=2.9e3;
+pf=0.8; //power factor lagging
+
+//case1
+printf("\n (a)")
+Ip=P/Vp; //primary current in A
+Is=P/Vs; //secondary current in A
+Ip_square_rp=Ip^(2)*rp; //primary copper loss
+Is_square_rs=Is^(2)*rs; //secondary copper loss
+FL_copper_loss=Ip_square_rp+Is_square_rs; //FL means "full load"
+FL_total_loss=iron_loss+FL_copper_loss;
+FL_output_power=P*pf;
+FL_input_power=FL_output_power+FL_total_loss;
+FL_efficiency=(FL_output_power/FL_input_power)*100;
+printf("\n Full load efficiency=%2.2f percentage \n",FL_efficiency)
+
+//case2
+printf("\n (b)")
+HL_copper_loss=FL_copper_loss*(0.5^2); //HL means "half load"
+HL_total_loss=iron_loss+HL_copper_loss;
+HL_output_power=FL_output_power/2;
+HL_input_power=HL_output_power+HL_total_loss;
+HL_efficiency=(HL_output_power/HL_input_power)*100;
+printf("\n Half load efficiency=%2.4f percentage \n",HL_efficiency)
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