initial commit / add all books

1 files changed, 29 insertions, 0 deletions

diff --git a/1430/CH7/EX7.9/exa7_9.sce b/1430/CH7/EX7.9/exa7_9.sce
new file mode 100644
index 000000000..1504575ac
--- /dev/null
+++ b/1430/CH7/EX7.9/exa7_9.sce
@@ -0,0 +1,29 @@
+// Example 7.9

+// Power-Factor Correction with Parallel Loads

+V_l=780; // Generator Line voltage

+f=60; // Cyclic frequency (Hz)

+Z1_del= complex(30,60); // Load 1; balanced delta impedance

+Z2_wye=complex(30,0);// Load 2; balanced wye with impedance

+// Equivalent wye impedance of the delta load is ,

+Z1_wye=Z1_del/3;

+// Potential at equivalent neutral N1 of the delta load equals the potential at 

+// N2 in the wye load

+// Hence from figure 7.24(b)

+Z_wye=(Z1_wye*Z2_wye)/(Z1_wye+Z2_wye);// Equivalent wye impedance per phase

+V_phi= V_l/sqrt(3); // Phase voltage from line voltage

+I_rms=V_phi/abs(Z_wye); // RMS current for one phase of the combined load

+P_phi=real(Z_wye)*I_rms^2; // Real power

+Q_phi=imag(Z_wye)*I_rms^2; // Reactive power

+// For balanced condition ,the three capacitor must be equal and arranged in a 

+// delta or wye configuration

+C_del=Q_phi/(2*%pi*f*V_l^2); // For delta configuration

+C_wye= 3*C_del; // For wye configuration

+Q_C=-Q_phi; // Condition for connecting capacitor

+// Total Average power supplied by the generator

+P=3*P_phi;

+I_l=P/(sqrt(3)*V_l);// RMS line current

+disp(C_del,"Capacitance for power factor correction in delta configuration(in farad)=")

+disp(C_wye,"Capacitance for power factor correction in wye configuration(in farad)=")

+disp(P,"Total average power supplied by the generator(in Watt)=")

+disp(I_l,"RMS line current(in Amps)=")

+// NOTE- Computed Values for C_del and C_wye in Textbook is wrong.