ABB CR Series User Manual

TYPES
CR
,
CRC
,
CRP
AND
CRD
RELAYS
INTERNAL
SCHEMATIC
INTERNAL
SCHEMATIC
DIRECTIONAL
UNIT
OIRECTIONAL
UNIT
.
INDICATING
CONTACTOR
SWITCH
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FRONT
VIEW
FRONT
VIEW
WITH
RELATIVE
INSTANTANEOUS
POLARITY
AS
SHOW
THE
OIRECTIONAL
WIT
CONTACTS
CLOSE
WITH
RELATIVE
INSTANTANEOUS
POLARITf
AS
SHOWN
THE
OIRECTIONAL
UNIT
CONTACTS
CLOSE
Sub
3
57
D
4543
Sub
2
57
D
4547
Fig
.
5
.
Internal
Schematic
of
double
trip
,
directional
over
-
current
relay
type
CR
in
type
FT
21
Case
.
For
the
single
trip
relay
the
circuits
associated
with
ter
-
minal
2
are
omitted
,
57
D
4549
.
Fig
.
6
.
Internal
Schematic
of
double
trip
,
directional
over
-
current
relay
type
CRC
in
type
FT
21
Case
.
For
the
single
trip
relay
the
circuits
associated
with
ter
•
minal
2
are
omitted
,
S
7
D
4539
.
D
.
Directional
Unit
(
D
)
The
bridge
is
secured
to
the
electromagnet
and
frame
by
two
mounting
screws
,
in
addition
to
holding
the
upper
pin
bearing
,
the
bridge
is
used
for
mounting
the
adjustable
stationary
contact
housing
,
stationary
contact
housing
is
held
in
position
by
a
spring
type
clamp
.
The
spring
adjuster
is
located
on
the
underside
of
the
bridge
and
is
attached
to
the
moving
contact
arm
by
a
spiral
spring
.
The
spring
adjuster
is
also
held
in
place
by
a
spring
type
clamp
.
With
the
contacts
closed
,
the
electrical
con
-
nection
is
made
through
the
stationary
contact
hous
-
ing
clamp
,
to
the
moving
contact
,
through
the
spiral
spring
out
to
the
spring
adjuster
clamp
.
The
directional
unit
is
a
product
induction
cylinder
type
unit
operating
on
the
interaction
between
the
polarizing
cir
-
cuit
flux
and
the
operating
circuit
flux
.
Mechanically
,
the
directional
unit
is
composed
of
four
basic
components
:
a
die
-
cast
aluminum
frame
,
an
electro
-
magnet
,
a
moving
element
assembly
,
and
a
molded
bridge
.
The
frame
serves
as
the
mounting
structure
for
the
mag
-
netic
core
.
The
magnetic
core
which
houses
the
lower
pin
bearing
is
secured
to
the
frame
by
a
locking
nut
.
The
bear
-
ing
can
be
replaced
,
if
necessary
,
without
having
to
remove
the
magnetic
core
from
the
frame
.
The
The
contacts
of
the
directional
unit
are
con
-
nected
in
series
with
the
shading
coil
of
the
over
-
current
unit
,
thus
giving
directional
control
of
the
overcurrent
unit
,
relay
from
operating
for
faults
in
the
non
-
tripping
direction
.
The
electromagnet
has
two
series
-
connected
polarizing
coils
mounted
diametrically
opposite
one
another
:
two
series
-
connected
operating
coils
mounted
diametrically
opposite
one
another
;
two
magnetic
adjusting
plugs
;
upper
and
lower
adjusting
plug
clips
,
and
two
locating
pins
.
The
locating
pins
are
used
to
accurately
position
the
lower
pin
bearing
,
which
is
mounted
on
the
frame
,
with
respect
to
the
upper
pin
bearing
,
which
is
threaded
into
the
bridge
.
The
electromagnet
is
secured
to
the
frame
by
four
mounting
screws
.
This
arrangement
prevents
the
CHARACTERISTICS
The
time
characteristics
of
the
directional
over
-
current
relays
are
designated
by
specific
numbers
as
indicated
in
Table
I
(
e
.
g
.
CR
-
8
)
.
TABLE
I
The
moving
element
assembly
consists
of
a
spiral
spring
,
contact
carrying
member
,
and
an
alu
-
minum
cylinder
assembled
to
a
molded
hub
which
holds
the
shaft
.
The
shaft
has
removable
top
and
bottom
jewel
bearings
.
The
shaft
rides
between
the
bottom
pin
bearing
and
the
upper
pin
bearing
with
the
cylinder
rotating
in
an
air
gap
formed
by
the
electro
-
magnet
and
the
magnetic
core
.
The
stops
for
the
moving
element
contact
arm
are
an
integral
part
of
the
bridge
.
Time
Characteri
Stics
Designation
Short
Time
Long
Time
Definite
Time
Moderately
Inverse
Time
Inverse
Time
Very
Inverse
Time
Extremely
Inverse
Time
2
5
6
7
8
9
11
4
Courtesy of NationalSwitchgear.com

ABB CR Series Specifications

General

Brand	ABB
Model	CR Series
Category	Relays
Language	English