diff options
Diffstat (limited to '1319/CH3/EX3.9/3_9.sce')
-rw-r--r-- | 1319/CH3/EX3.9/3_9.sce | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/1319/CH3/EX3.9/3_9.sce b/1319/CH3/EX3.9/3_9.sce new file mode 100644 index 000000000..bd0aa2516 --- /dev/null +++ b/1319/CH3/EX3.9/3_9.sce @@ -0,0 +1,48 @@ +//To find power using two wattmeter method of a circuit with non reactive resistances
+
+clc;
+clear;
+
+V=400; // Line Voltage
+Vph=V/(sqrt(3)); // Magnitude of Phase Voltage
+
+// Phase Voltage in RYB sequnce
+Vr=Vph*(expm(%i*0));
+Vy=Vph*(expm(%i*-2*%pi/3));
+Vb=Vph*(expm(%i*2*%pi/3));
+
+// Resitances of the RYB limbs
+Rr=10;
+Ry=15;
+Rb=20;
+
+// Taking Vr as reference
+// Millain's Theorem
+
+Vs= ((Vr/Rr)+(Vy/Ry)+(Vb/Rb))/((1/Rr)+(1/Ry)+(1/Rb)); // Star point voltage
+
+//Line Currents in RYB sequence
+Ir= (Vr-Vs)/Rr;
+Iy= (Vy-Vs)/Ry;
+Ib= (Vb-Vs)/Rb;
+
+Vry=Vr-Vy;
+Vby=Vb-Vy;
+
+W1= real(Vry*conj(Ir));
+W2= real(Vby*conj(Ib));
+
+Wt= W1+W2; // Total Power
+
+// Note Iy in the text book there is a error in the sign of the real part of Vy
+
+printf('The line currents in RYB sequence are : \n')
+disp(Ir,' R line :')
+printf(' Magnitude = %g A \n',abs(Ir))
+disp(Iy,' Y line :')
+printf(' Magnitude = %g A\n',abs(Iy))
+disp(Ib,' B line :')
+printf(' Magnitude = %g A\n \n',abs(Ib))
+printf(' Total Power = %g kW \n \n',Wt/1000)
+printf(' W1 = %g kW\n',W1/1000)
+printf(' W2 = %g kW\n',W2/1000)
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