EXPERIMENT – 3

OBJECT: - To obtain steady state transient and sub transient short circuit currents of a three phase alternator.

CODE:- clc;

clear all;

f=50;

w=2*pi*f;

Xd1=0.5;

Xd2=0.4;

Xd=1.2;

E=1.0;

delta=0;

Td1=0.35;

Td2=1.0;

id2=(sqrt(2)*E)/Xd2

id1=(sqrt(2)*E)/Xd1

id=(sqrt(2)*E)/Xd

for t=0:0.0001:1

i=sqrt(2)*E*((1/Xd2-1/Xd1)*exp(-t/Td2)+(1/Xd1-1/Xd)*exp(-t/Td1)+(1/Xd))*sin(w*t+delta);

hold all

plot(t,i)

end

xlabel(' t(sec) ')

ylabel('i(amp)')

RESULT :- id2 =3.5355 , id1 =2.8284 , id =1.1785

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-4

-3

-2

-1

0

1

2

3

4

t(sec)

i(amp)