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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 8: AC DYNAMO TORQUE RELATIONS - SYNCHRONOUS MOTORS
+// Example 8-12
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+S_conjugate = 1000 ; // Apparent complex power in kVA
+cos_theta_f = 0.8 ; // lagging PF
+sin_theta_f = sqrt( 1 - (cos_theta_f)^2 );
+
+// Calculated values from Ex.8-11
+P_o = 600 ; // Active power dissipated by the load in kW
+Q_o = 800 ; // Inductive reactive quadrature power - 
+// - drawn from and returned to the supply 
+
+// Calculations :
+ 
+// case a
+P_f = S_conjugate * cos_theta_f ; // Active power dissipated by the load in kW
+
+// case b
+Q_f = S_conjugate * sin_theta_f ; // Reactive quadrature power drawn from -
+//  - and returned to the supply
+
+// case c
+P_a = P_f - P_o ; // Additional active power in kW that may be supplied to -
+// - new customers
+
+// case d
+jQ_a = %i * ( Q_f ) - %i * ( Q_o ); // Correction kvar required to raise PF -
+// -from 0.6 to o.8 lagging
+
+// case e
+S_c_conjugate = 0 - jQ_a ; // Rating of correction capacitors needed for case d
+
+// Display the results
+
+disp("Example 8-12 Solution : ");
+printf(" \n a: P_f = %d kW \n ", P_f );
+printf(" \n b: +jQ_f in kvar = ");disp(%i*Q_f);
+printf(" \n c: P_a = %d kW \n ", P_a );
+printf(" \n d: jQ_a in kvar =   ");disp(jQ_a)
+printf(" \n e: S_c_conjugate = %d kVA \n ", abs(S_c_conjugate) );
+printf(" \n f: The power tabulation grid is shown in Fig.8-26b.");