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Diffstat (limited to '3802/CH7/EX7.4/Ex7_4.sce')
| -rw-r--r-- | 3802/CH7/EX7.4/Ex7_4.sce | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/3802/CH7/EX7.4/Ex7_4.sce b/3802/CH7/EX7.4/Ex7_4.sce new file mode 100644 index 000000000..de9b6552d --- /dev/null +++ b/3802/CH7/EX7.4/Ex7_4.sce @@ -0,0 +1,46 @@ +//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex7_4.sce.
+
+clc;
+clear;
+P=75e3; //power rating of transformer in KVA
+Np=500; //number of Primary turns
+Ns=100; //number of secondary turns
+rp=0.4; //primary winding resistance in ohms
+rs=0.02; //secondary winding resistance in ohms
+xp=1.5; //primary winding leakage reactance in ohms
+xs=0.045; //secondary winding leakage reactance in ohms
+Vs=2200; //supply voltage in volts
+
+//case1
+printf("\n (a)")
+Re=rp+(Np/Ns)^2*rs; //Equivalent resistance in ohms
+Xe=xp+(Np/Ns)^2*xs; //Equivalent leakage reactance in ohms
+Ze=sqrt(Re^2+Xe^2);
+printf("\n Equivalent impedance referred to prinmary side=%1.3f ohms\n",Ze)
+
+//case2
+printf("\n (b).1")
+I1=P/Vs; //full load primary current in A
+cos_pi2=0.8;
+sin_pi2=sind(acosd(0.8));
+percentage_voltage_reg=((I1*((Re*cos_pi2)+(Xe*sin_pi2)))/Vs)*100;
+printf("\n Voltage regulation for 0.8 power factor lagging=%1.2f percentage \n",percentage_voltage_reg)
+NL_secondary_voltage=(Ns/Np)*Vs; //NL means "no load"
+del_V=(NL_secondary_voltage*percentage_voltage_reg)/100;
+FL_secondary_voltage=(NL_secondary_voltage)-(del_V);
+printf("\n Secodary terminal voltage at FL 0.8 power factor lagging=%3.3f V \n",FL_secondary_voltage)
+
+//case3
+printf("\n (b).2")
+percentage_voltage_reg=((I1*((Re*cos_pi2)-(Xe*sin_pi2)))/Vs)*100;
+printf("\n Voltage regulation for 0.8 power factor leading=%1.3f percentage \n",percentage_voltage_reg)
+del_V=(NL_secondary_voltage*percentage_voltage_reg)/100;
+FL_secondary_voltage=(NL_secondary_voltage)-(del_V);
+printf("\n Secodary terminal voltage at FL 0.8 power factor leading=%4.4f V \n",FL_secondary_voltage)
+//The anwser vary dueto roundoff error
+
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