From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books
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1092/CH6/EX6.6/Example6_6.sce | 51 +++++++++++++++++++++++++++++++++++++++++++
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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 6-6
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+// 3-phase Y-connected alternator
+E_L = 11000 ; // Line voltage generated in volt
+kVA = 165000 ; // kVA rating of the alternator
+R_p = 0.1 ; // Armature resistance in ohm/per phase
+Z_p = 1.0 ; // Synchronous reactance/phase
+Z_r = 0.8 ; // Reactor reactance/phase
+
+// Calculations
+E_p = E_L / sqrt(3); // Rated phase voltage in volt
+I_p = (kVA * 1000)/(3*E_p); // Rated current per phase in A
+
+// case a
+I_max_a = E_p / R_p ; // Maximum short-circuit current in A (case a)
+overload_a = I_max_a / I_p ; // Overload (case a)
+
+// case b
+I_steady = E_p / Z_p ; // Sustained short-circuit current in A
+overload_b = I_steady / I_p ; // Overload (case b)
+
+// case c
+Z_t = R_p + %i*Z_r ; // Total reactance per phase
+I_max_c = E_p / Z_t ; // Maximum short-circuit current in A (case b)
+I_max_c_m=abs(I_max_c);//I_max_c_m=magnitude of I_max_c in A
+I_max_c_a=atan(imag(I_max_c) /real(I_max_c))*180/%pi;//I_max_c_a=phase angle of I_max_c in degrees
+overload_c = I_max_c_m / I_p ; // Overload (case a)
+
+// Display the results
+disp("Example 6-6 Solution : ");
+printf("\n root 3 value is taken as %f , so slight variations in the answer.\n", sqrt(3));
+printf(" \n a: I_max = %d A ", I_max_a );
+printf(" \n overload = %.1f * rated current \n", overload_a );
+
+printf(" \n b: I_steady = %d A ", I_steady );
+printf(" \n overload = %.2f * rated current \n", overload_b );
+
+printf(" \n c: Rectangular form :\n I_max = "); disp(I_max_c);
+printf(" \n Polar form :");
+printf(" \n I_max = %d <%.2f A ", I_max_c_m , I_max_c_a );
+printf(" \n where %d is magnitude and %.2f is phase angle\n",I_max_c_m,I_max_c_a);
+printf(" \n overload = %.3f * rated current \n", overload_c );
--
cgit