8/19/2019 Experiment4 by Irfan
9/9
Explanation:
.e ha/e +ut em+hasie o( determi(i(- the short circuit curre(t
which f,ows
throu-h the tra(smissio( ,i(e& or a defi(ite ,i(e to ,i(e
fau,t fau,t curre(t is
ca,cu,ated from the co(ditio( of differe(t ty+es of
fau,t&
rom our a(a,ysis of ,i(e to -rou(d fau,t we see that the curre(t
i( the
u(affected ,i(es are 0 & '( case of u(symmetrica,
fau,te&-& LL L LL fau,t5 we
ca( ta!e ad/a(ta-e of the a(a,ysis of symmetrica, com+o(e(t
&
0atin(s of Circuit brea1ers:
Circuit brea!ers are +rotecti/e de/ices which iso,ates the
fau,ty +art of the
system from rest of the system a(d +rotects the e,ectrica,
de/ices from tota,
dama-es duri(- short circuit co(ditio(& The rati(- of the
circuit brea!er shou,d be
matched with mi(imum amou(t of fau,t curre(t which is su++osed
to f,ow throu-h
the fau,ty ,i(es&
.e shou,d co(sider fo,,owi(- thi(-s whi,e se,ecti(- a
circuit brea!er
1&Tota, curre(t which causes the brea!er to i(terru+t the
circuit&
2&The maimum curre(t which the brea!er must carry away
without disco((ecti(-
circuit&
Discussion:
1& The first ri(- co(tributio( are fau,t curre(ts from ,i(!s
ad7ace(t to the
fau,ted bus&
2& 8ati(- of circuit brea!er is im+orta(t as it wi,, ha/e to
+rotect the
e,ectrica, de/ice duri(- short circuit co(ditio( or o/erf,ow of
curre(t&
3& rom the +,ot of fau,t ,ocatio( /s& fau,t curre(t
circuit brea!er rati(- ca(
be chose( & The ,owest curre(t of the fau,t after
co(sideri(- a,, fau,t is the
rati(- of the circuit brea!er for a -i/e( tra(smissio(
,i(e&
4& Symmetrica, fau,ts are rare,y occurred i( com+ariso( of
u(symmetrica,
fau,t
5. au,t curre(t co(sists of si(usoida, or AC com+o(e(t a(d (o(
si(usoida,
com+o(e(t& o( si(usoida, com+o(e(t decays e+o(e(tia,,y with
a time
co(sta(t of L98&
