blob: b30c19bc3d2f0f826a73c5b7299e530109db1ef4 (
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 7 example 3
clc;clear all;
//variable declaration
V = 240; //voltage in V
I = 8; //current in A
x = 0.1; //pf lagging
Rp = 8000; //resistance in Ω
f = 50; //frequency in Hz
L = 63.6*10^-3 //inductance
//calculations
phi = acos(x);
phi1 =(phi*180)/%pi;
P = V*I*x; //load power
Pl = (V^2)/Rp; //power lost in the pressure coil circuit in watts
Pt = P+Pl; //neglecting inductance of the voltage coil the reading of wattmeter would be in watts
Xp = 2*%pi*f*L; //reactance in Ω
theta = atan(Xp/Rp);
theta1 = (theta*180)/%pi;
A = cos(theta1);
B =cos(phi1-theta1);
C = cos(phi1);
w = Pt*(A)*(B/C); //wattmeter reading
e = ((w-P)/P)*100; //percentage error in %
//result
mprintf("phi value in textbook is taken wrong correct is 84°.16 but value is 84°.26 so textbook answer is coming wrong")
mprintf("\npercentage error in %3.2f percentage ",e);
|
