blob: 3795dce56e418de4ea0ccc34058fbacc92d67f4a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
//============================================================================
//Chapter 6 Example 22
clc;
clear all;
//variable declaration
r = 12.5; //rate burden in VA
Is = 5' //secondary rated curret in A
f = 50; //frequency in Hz
L = 0.96*10^-3;
Im = 16; //magnetising component of exciting current in A
Ie = 12; //energy component of exciting current in A
Is = 5; //secondary rated current in A
//calculations
KN = 1000/5; ///nominal ration
KT = 196/1; //turn ratio
Es = r/Is; //secondary rated voltage in V
Zs = Es/Is; //secondary impedance in Ω
Xs = 2*%pi*f*L; //secondary reactance in Ω
theta = (asin(Xs/Zs))*180/%pi; //secondary circuit phase angle in °
KC = KT+(((Ie*cos(theta*%pi/180))+(Im*sin(theta*%pi/180)))/Is);
e = ((KN-KC)/KC)*100; //ratio error
beta = (180/%pi)*(((Im*cos(theta*%pi/180))-(Ie*sin(theta*%pi/180)))/(KT*Is)); //phase angle erro in °
//result
mprintf("ratio error = %3.2f percentage ",e);
mprintf("\nphase angle error = %3.2f °",beta);
|
