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Fu
nctio
ns
2.2
Ove
rcu
rren
t Pro
tectio
n 5
0, 5
1, 5
0N
, 51
N
SIP
RO
TE
C, 7
SJ6
2/6
4, M
an
ua
lC
5300
0-G
1140-C
207-6
, Re
lea
se d
ate
11.2
012
63
2.2
Ov
erc
urre
nt P
rote
ctio
n 5
0, 5
1, 5
0N
, 51
N
Overc
urre
nt p
rote
ctio
n is
the m
ain
pro
tectio
n fu
nctio
n o
f the 7
SJ62
/64
rela
y. Each
phase c
urre
nt a
nd
the
gro
und c
urre
nt is
pro
vid
ed w
ith fo
ur e
lem
ents
. All e
lem
ents
are
ind
epe
nden
t from
ea
ch o
ther a
nd c
an b
e c
om
-
bin
ed a
s d
esire
d.
If it is d
esire
d in
gro
und
ed o
r com
pen
sa
ted s
yste
ms th
at th
ree-p
hase d
evic
es s
hould
work
toge
ther w
ith tw
o-
ph
ase p
rote
ctio
n e
quip
me
nt, th
e o
verc
urre
nt p
rote
ctio
n c
an
be c
onfig
ure
d in
such a
way th
at it a
llow
s tw
o-
ph
ase o
pe
ratio
n b
esid
es th
ree-p
hase m
ode (s
ee S
ectio
n 2
.1.3
.2).
The h
igh
-set e
lem
ents
50
-3 a
nd 5
0-2
as w
ell a
s th
e o
ve
rcurre
nt e
lem
ent 5
0-1
alw
ays o
pera
te w
ith d
efin
ite trip
-
pin
g tim
e, th
e fo
urth
ele
me
nt 5
1 a
lways w
ith in
vers
e trip
pin
g tim
e.
Ap
plic
atio
ns•
The n
on-d
irectio
nal o
verc
urre
nt p
rote
ctio
n is
suite
d fo
r radia
l syste
ms w
ith s
ingle
-sid
e in
feed o
r op
en rin
g
syste
ms, fo
r backup p
rote
ctio
n o
f all k
inds o
f com
paris
on p
rote
ctio
n e
quip
ment fo
r lines, tra
nsfo
rmers
, gen-
era
tors
, mo
tors
, and b
usbars
.
2.2
.1G
en
era
l
De
pend
ing o
n p
ara
mete
r 61350N/51N/67N w.
the o
verc
urre
nt p
rote
ctio
n fo
r the g
rou
nd c
urre
nt c
an
eith
er
op
era
te w
ith m
easure
d v
alu
es I
N o
r with
the q
ua
ntitie
s 3I0
ca
lcula
ted fro
m th
e th
ree p
ha
se
cu
rrents
. Devic
es
featu
ring a
se
nsitiv
e g
rou
nd c
urre
nt in
pu
t, how
ever, g
en
era
lly u
se
the
calc
ula
ted
qu
antity
3I0
.
All o
verc
urre
nt e
lem
ents
ena
ble
d in
the d
evic
e m
ay b
e b
locked
via
the a
uto
matic
reclo
sin
g fu
nctio
n (d
ep
endin
g
on th
e c
ycle
) or v
ia a
n e
xte
rnal s
ignal to
the b
ina
ry in
puts
of th
e d
evic
e. R
em
oval o
f blo
ckin
g d
urin
g p
ickup w
ill
resta
rt time d
ela
ys. T
he
Man
ual C
lose s
ign
al is
an
exce
ptio
n in
this
ca
se. If a
circ
uit b
reaker is
manu
ally
clo
se
d
on
to a
fault, it c
an b
e re
-ope
ned im
media
tely. F
or o
verc
urre
nt e
lem
ents
or h
igh-s
et e
lem
en
ts th
e d
ela
y m
ay b
e
bypa
ssed v
ia a
Manua
l Clo
se
pu
lse, th
us re
su
lting in
hig
h s
pee
d trip
pin
g. T
his
puls
e is
exte
nded
up to
at le
ast
30
0 m
s.
The a
uto
matic
reclo
su
re fu
nctio
n 7
9 m
ay a
lso in
itiate
imm
edia
te trip
pin
g fo
r the o
ve
rcu
rrent a
nd h
igh-s
et e
le-
ments
depe
ndin
g o
n th
e c
ycle
.
Pic
kup
of th
e d
efin
ite-tim
e e
lem
ents
ca
n b
e s
tab
ilize
d b
y s
ettin
g th
e d
ropou
t times. T
his
pro
tectio
n is
used
in
syste
ms w
here
inte
rmitte
nt fa
ults
occur. C
om
bin
ed w
ith e
lectro
mechanic
al re
lays, it a
llow
s d
iffere
nt d
ropout re
-
spo
nses to
be
adju
ste
d a
nd a
time
gra
din
g o
f dig
ital a
nd
ele
ctro
mechan
ical re
lays to
be im
ple
mente
d.
Pic
kup
an
d d
ela
y s
ettin
gs m
ay b
e q
uic
kly
ada
pte
d to
syste
m re
qu
irem
ents
via
dyn
am
ic s
ettin
g c
han
geove
r (see
Sectio
n 2
.4).
Trip
pin
g b
y th
e 5
0-1
and
51
ele
ments
(in p
hases), 5
0N
-1 a
nd 5
1N
ele
ments
(in g
rou
nd p
ath
) ma
y b
e b
locked
for in
rush c
on
ditio
ns b
y u
tilizin
g th
e in
rush
restra
int fe
atu
re.
