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Diffstat (limited to '1445/CH7/EX7.39/ch7_ex_39.sce')
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diff --git a/1445/CH7/EX7.39/ch7_ex_39.sce b/1445/CH7/EX7.39/ch7_ex_39.sce new file mode 100644 index 000000000..c63aff2d6 --- /dev/null +++ b/1445/CH7/EX7.39/ch7_ex_39.sce @@ -0,0 +1,39 @@ +//CHAPTER 7- SINGLE PHASE TRANSFORMER +//Example 39 + +disp("CHAPTER 7"); +disp("EXAMPLE 39"); + +//VARIABLE INITIALIZATION +v1=220; //primary voltage in Volts +v2=440; //secondary voltage in Volts +f1=50; +f2=25; +//loads +V=110 +//say, else computation may not be possible using computer +Pout1=100; //in watt, just assumed for computational purposes for the 220V supply +We1=0.01*Pout1; //in Watts at 220 V, eddy losses which are 1% of the output at 220V +Wh1=0.01*Pout1; //in Watts at 220 V, hysteresis losses which are 1% of the output at 220V +//Pc1=We1+Wh1; //Total iron losses which equals We+Wh due to eddy and hysteresis +Pcu1=0.01*Pout1; //copper losses +// +//SOLUTION +//since on connecting to half the power ie 110V, the output would get halved +Pout2=Pout1/2; +xPcu=Pcu1/Pout2; +disp(sprintf("The copper losses at 110 V would be %f percent of the output",xPcu*100)); +//now coming to frequency dependant losses ie eddy and hysteresis +//since we know that We=kh.f.B^1.6 and Wh=Ke.Kf^2.f^2.B^2 +//since all being constant exept frequency, we may take We2/We1=f2^2/f1^2 +//and Wh2/Wh1=f2/f1 +//find values for We2 and Wh2, whence Pc2=We2+Wh2 +We2=f2^2*We1/f1^2; +Wh2=f2*Wh1/f1; +xWe=We2/Pout2; +xWh=Wh2/Pout2; +disp(sprintf("The eddy losses at 110 V would be %f percent of the output",xWe*100)); +disp(sprintf("The hysteresis losses at 110 V would be %f percent of the output",xWh*100)); +disp(" "); +// +//END |