ABB 511 Series - Page 4

IB
-
7.2
.
1.7
-
1
PAGE
4
SOLID
-
STATE
OVERCURRENT
RELAYS
A
portion
of
the
control
voltage
is
applied
to
the
time
circuit
when
the
TIME
pushbutton
is
depressed
.
The
time
del
$
y
circuit
then
produces
a
trip
signal
,
in
a
time
corresponding
to
approximately
two
(
2
)
multiples
of
current
tap
setting
,
(
at
nominal
control
voltage
)
,
and
the
TIME
target
operates
.
For
this
test
the
INST
,
pickup
must
be
set
above
(
2
)
multiples
or
the
INST
,
element
will
trip
first
.
Similarly
,
a
portion
of
the
control
voltage
is
applied
to
the
INST
,
circuit
when
the
INST
,
pushbutton
is
depressed
,
producing
a
trip
signal
and
operating
the
INST
,
target
.
On
special
three
phase
relays
with
individual
phase
targets
,
the
tests
described
will
cause
the
middle
phase
target
to
operate
in
addition
to
the
TIME
or
INST
,
target
.
Test
Accessory
A
test
accessory
which
can
be
used
to
quickly
check
the
primary
C
.
T
.
'
s
,
the
upper
non
-
drawout
input
section
of
the
relay
,
control
power
,
and
the
continuity
of
the
trip
circuit
is
available
from
the
factory
.
This
drawout
test
accessory
is
plugged
into
the
relay
in
place
of
the
drawout
element
to
make
the
checks
.
See
IB
-
7.2
.
1.7
-
2
for
details
.
These
overcurrent
relays
are
offered
with
the
follow
-
ing
pickup
ranges
:
Taps
$
Range
0.1
,
0.15
,
0.2
,
0.25
,
0.3
,
0.4
,
0.5
0.1
-
0.5
0.5
,
0.6
,
0.8
,
1.0
,
1.2
,
1.5
,
2.0
0.5
-
2.0
1.5
,
2.0
,
2.5
,
3
,
4
,
5
,
6
1.5
-
6.0
2
,
5
,
2.8
,
3.1
,
3.5
,
4.0
,
4.5
,
5.0
2.5
-
5
2.5
,
3.75
,
5
,
6.3
,
7.5
,
8.6
,
10
2.5
-
10
4
,
5
,
6
,
7
,
8
,
10
,
12
4
-
12
$
When
tap
plug
is
removed
,
affected
phase
reverts
to
the
maximum
pickup
.
TOLERANCES
TIME
PICKUP
TIME
DELAY
dial
#
10
(
2
-
20
multiples
)
dial
#
1
(
2
-
20
multiples
)
±
5
%
of
tap
setting
±
5
%
10
ms
or
±
10
%
(
whichever
is
larger
)
±
10
%
of
pickup
amps
(
tap
x
dial
setting
)
INST
.
PICKUP
RATINGS
APPLICATION
DATA
TEMPERATURE
The
Type
51
series
of
overcurrent
relays
provide
overcurrent
protection
phase
-
to
-
phase
or
phase
-
to
-
ground
.
They
are
designed
to
be
operated
by
standard
five
(
5
)
ampere
secondary
current
transformers
.
The
output
circuit
(
trip
circuit
)
will
operate
conventional
cir
-
cuit
breaker
trip
coils
at
the
DC
voltage
specified
on
the
relay
nameplate
.
These
relays
can
oe
used
for
all
applications
where
conventional
electromechanical
relays
are
used
.
They
come
in
seven
different
time
-
current
curve
families
,
INVERSE
(
511
)
,
VERY
INVERSE
(
51
Y
)
,
EXTREMELY
INVERSE
(
51
E
)
,
SHORT
TIME
(
51
S
)
,
LONG
TIME
(
51
L
)
,
DEFINITE
TIME
(
51
D
)
,
LONG
TIME
INVERSE
(
51
IM
)
,
and
LONG
TIME
VERY
INVERSE
(
51
YM
)
.
A
standard
INSTANTANEOUS
function
or
a
special
INVERSE
INSTANTANEOUS
function
can
be
furnished
as
an
option
with
any
of
the
time
families
.
.
.
.
25
°
C
ambient
-
15
CC
to
+
55
°
C
-
30
°
C
to
+
70
°
C
Nominal
Additional
±
5
%
tolerance
Must
operate
FREQUENCY
Nominal
Additional
±
5
%
tolerance
60
Hertz
.
+
1
to
-
3
Hertz
INPUT
CIRCUIT
Phase
one
(
1
)
current
—
terminals
1
and
2
.
Phase
two
(
2
)
current
—
terminals
3
and
4
.
Phase
three
(
3
)
current
—
terminals
5
and
6
.
The
current
input
for
single
-
phase
relays
is
made
at
terminals
3
and
4
.
Each
input
current
is
fed
to
a
tapped
transformer
primary
.
The
secondary
winding
produces
a
voltage
across
a
burden
resistor
.
This
voltage
is
rectified
and
supplied
to
the
static
circuitry
.
The
pickup
of
the
static
circuit
is
adjusted
to
the
desired
pickup
current
by
tap
selection
of
the
transformer
primary
turns
.
Any
one
of
seven
control
voltages
can
be
obtained
:
24
Vdc
,
32
Vdc
,
48
Vdc
,
125
Vdc
,
250
Vdc
,
175
Vdc
(
120
Vac
capacitor
trip
)
,
350
Vdc
(
240
Vac
capacitor
trip
)
.
Courtesy of NationalSwitchgear.com