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+// Electric Machinery and Transformers

+// Irving L kosow 

+// Prentice Hall of India

+// 2nd editiom

+

+// Chapter 6: AC DYNAMO VOLTAGE RELATIONS-ALTERNATORS

+// Example 6-3

+

+clear; clc; close; // Clear the work space and console.

+

+// Given data

+// From Ex.6-1 and Ex.6-2 we have V_P and E_g values as follows

+// Note : approximated values are considered when root 3 value is taken as 1.73 

+// as in textbook

+V_P = 2660 ; // Phase voltage 

+E_g_a1 = 3836 ; // E_g at unity PF (Ex.6-1 case a)

+E_g_b1 = 4814 ; // E_g at 0.75 PF lagging (Ex.6-1 case b)

+ 

+E_g_a2 = 2364 ; // E_g at 0.75 PF leading (Ex.6-2 case a)

+E_g_b2 = 1315 ; // E_g at 0.40 PF leading (Ex.6-2 case b)

+

+// Calculations

+VR_a = ( E_g_a1 - V_P )/V_P * 100 ; // voltage regulation at unity PF  (Ex.6-1 case a)

+VR_b = ( E_g_b1 - V_P )/V_P * 100 ; // voltage regulation at 0.75 PF lagging (Ex.6-1 case b)

+

+VR_c = ( E_g_a2 - V_P )/V_P * 100 ; // voltage regulation at 0.75 PF leading (Ex.6-2 case a)

+VR_d = ( E_g_b2 - V_P )/V_P * 100 ; // voltage regulation at 0.40 PF leading (Ex.6-2 case b)

+

+// Display the results

+disp("Example 6-3 Solution : ");

+printf(" \n a: At unity PF : ");

+printf(" \n    VR = %.1f percent \n ", VR_a );

+

+printf(" \n b: At 0.75 PF lagging : ");

+printf(" \n    VR = %.2f percent \n ", VR_b );

+

+printf(" \n c: At 0.75 PF leading : ");

+printf(" \n    VR = %.2f percent \n ", VR_c );

+

+printf(" \n d: At 0.40 PF leading : ");

+printf(" \n    VR = %.1f percent \n ", VR_d );