1 files changed, 57 insertions, 0 deletions
diff --git a/1092/CH7/EX7.7/Example7_7.sce b/1092/CH7/EX7.7/Example7_7.sce
new file mode 100755
index 000000000..7e08faf5b
--- /dev/null
+++ b/1092/CH7/EX7.7/Example7_7.sce
@@ -0,0 +1,57 @@
+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 7: PARALLEL OPERATION
+// Example 7-7
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data as per Ex.(7-5)
+E1 = 220 ; // Terminal voltage of alternator 1 in volt 
+E2 = 222 ; // Terminal voltage of alternator 2 in volt 
+f1 = 60 ; // Frequency of alternator 1 in Hz
+f2 = 59.5 ; // Frequency of alternator 2 in Hz
+// Switch is open
+
+// Given data as per Ex.(7-6)
+E = 220 ; // Voltage generated in volt
+E_1 = E ; // Voltage generated by alternator 1 in volt
+E_2 = E ; // Voltage generated by alternator 2 in volt
+f_1 = 60 ; // Frequency in Hz of alternator 1
+f_2 = 58 ; // Frequency in Hz of alternator 2
+// Switch is open
+
+// Given data as per Ex.(7-7)
+R_a1 = 0.1 ; // armature resistance of alternator 1 in ohm
+R_a2 = 0.1 ; // armature resistance of alternator 2 in ohm
+X_a1 = 0.9 ; // armature reactance of alternator 1 in ohm
+X_a2 = 0.9 ; // armature reactance of alternator 2 in ohm
+
+Z_1  = R_a1 + %i*X_a1 ; // Effective impedance of alternator 1 in ohm
+Z_2  = R_a1 + %i*X_a2 ; // Effective impedance of alternator 2 in ohm
+// Switches are closed at the proper instant for paralleling.
+
+// Calculations
+// In Ex.7-5,
+E_r = E2 - E1 ; // Effective voltage generated in volt 
+I_s = E_r / (Z_1 + Z_2); // Synchronizing current in the armature in A
+I_s_m = abs(I_s);//I_s_m=magnitude of I_s in A
+I_s_a = atan(imag(I_s) /real(I_s))*180/%pi;//I_s_a=phase angle of I_s in degrees
+
+// In Ex.7-6,
+Er = E_2 -E_1 ; // Effective voltage generated in volt 
+Is = Er / ( Z_1 + Z_2); // Synchronizing current in the armature in A
+
+// Display the results
+disp("Example 7-7 Solution : ");
+printf(" \n In Ex.7-5, ");
+printf(" \n E_r = %d V ", E_r);
+printf(" \n I_s = ");disp(I_s);
+printf(" \n I_s = %.3f <%.2f A ",I_s_m, I_s_a);
+printf(" \n where %.3f is magnitude in A and %.2f is phase angle in degrees \n",I_s_m,I_s_a);
+
+printf(" \n In Ex.7-6, ");
+printf(" \n E_r = %d V ", Er );
+printf(" \n I_s = %d A",Is);