ABB CR Series User Manual

TYPES
CR
,
CRC
,
CRP
AND
CRD
RELAYS
O
CAUTION
:
Since
the
tap
block
connector
screw
carries
operating
current
,
be
sure
that
the
screw
is
turned
tight
.
IN
ORDER
TO
AVOID
OPENING
CURRENT
TRANS
-
FORMER
CIRCUITS
WHEN
CHANGING
TAPS
UNDER
LOAD
,
THE
RELAY
MUST
BE
FIRST
REMOVED
FROM
THE
CASE
.
Chassis
operating
shorting
switches
on
the
case
will
short
the
secondary
of
the
current
transformer
.
The
taps
should
then
be
changed
with
the
relay
outside
of
the
case
and
then
re
-
inserted
into
the
case
.
Instantaneous
Reclosing
Type
CRP
Relay
The
voltage
polarized
relay
is
intended
for
ground
fault
protection
and
has
its
maximum
torque
when
the
current
lags
the
voltage
by
approximately
60
°
.
The
shifting
of
the
maximum
torque
angle
has
been
ac
-
complished
by
the
use
of
an
internally
mounted
phase
shifter
as
illustrated
in
Fig
.
7
.
The
type
CRP
relay
operates
on
residual
voltage
and
residual
current
.
See
Fig
.
22
.
The
directional
unit
minimum
pick
-
up
is
1
volt
and
2
amperes
at
its
maximum
torque
angle
for
the
0.5
to
2.5
ampere
and
the
2
to
6
ampere
range
relays
.
The
factory
adjustment
of
the
CO
unit
contacts
provides
a
contact
follow
.
Where
circuit
breaker
reclosing
will
be
initiated
immediately
after
a
trip
by
the
CO
contact
,
the
time
of
the
opening
of
the
contacts
should
be
a
minimum
.
This
condition
is
obtained
by
loosening
the
stationary
con
-
tact
mounting
screw
,
removing
the
contact
plate
and
then
replacing
the
plate
with
the
bent
end
resting
against
the
contact
spring
.
For
double
trip
relays
,
the
upper
stationary
contact
is
adjusted
such
that
the
contact
spring
rests
solidly
against
the
back
stop
.
The
lower
stationary
contact
is
then
ad
-
justed
such
that
both
stationary
contacts
make
contact
simultaneously
with
their
respective
moving
contact
.
B
.
Indicating
Contactor
Switch
(
ICS
)
Type
CRD
Relay
The
dual
polarized
type
relay
is
intended
for
ground
fault
protection
.
The
relay
can
be
polarized
from
a
potential
source
,
from
a
local
ground
source
,
or
from
both
simultaneously
.
The
type
CRD
relay
utilizes
the
directional
unit
of
the
type
CRC
relay
in
conjunction
with
the
direc
-
tional
unit
and
phase
shifting
mechanism
of
the
type
CRP
relay
.
The
directional
contacts
are
connected
in
parallel
to
torque
-
control
a
common
overcurrent
unit
.
See
Fig
.
8
.
The
only
setting
required
on
the
ICS
unit
is
the
selection
of
the
0.2
to
2.0
ampere
tap
setting
.
This
selection
is
made
by
connecting
the
lead
located
in
front
of
the
tap
block
to
the
desired
setting
by
means
of
the
connecting
screw
.
C
.
Indicating
Instantaneous
Trip
(
IIT
)
The
current
-
polarized
directional
unit
of
the
type
CRD
relay
onerates
on
residual
currents
while
the
potential
polarized
directional
unit
of
the
type
CRD
relay
operates
on
residual
voltage
and
residual
cur
-
rent
.
See
Fig
.
24
.
The
core
screw
must
be
adjusted
to
the
value
of
pick
-
up
desired
.
For
the
0.5
to
2.5
ampere
and
the
2
to
6
ampere
range
relays
,
the
minimum
pick
-
up
of
the
current
polarized
unit
is
0.5
ampere
in
each
winding
in
-
phase
and
the
minimum
pick
-
up
for
the
voltage
polarized
unit
is
1
volt
and
2
amperes
with
the
current
lagging
voltage
by
60
°
.
The
nameplate
data
will
furnish
the
actual
cur
-
rent
range
that
may
be
obtained
from
IIT
unit
.
D
.
Directional
Unit
(
D
)
SETTINGS
No
setting
is
required
.
A
.
Overcurrent
Unit
(
CO
)
INSTALLATION
The
overcurrent
unit
settings
can
be
defined
either
by
tap
settings
and
time
dial
position
or
by
tap
setting
and
a
specific
time
of
operation
at
some
current
multiple
of
the
tap
setting
(
e
.
g
.
4
tap
setting
,
2
time
dial
position
or
4
tap
setting
,
0.6
seconds
at
6
times
tap
value
current
)
.
To
provide
selective
circuit
breaker
operation
,
a
mini
-
mum
coordinating
time
of
0.3
seconds
plus
breaker
time
is
recommended
between
the
relay
being
set
and
the
relays
with
which
coordination
is
to
be
effected
.
The
relays
should
be
mounted
on
switchboard
panels
or
their
equivalent
in
a
location
free
from
dirt
,
moisture
,
excessive
vibration
and
heat
.
Mount
the
relay
vertically
by
means
of
the
two
mounting
studs
for
the
type
FT
projection
case
or
by
means
of
the
four
mounting
holes
on
the
flange
for
the
semi
-
flush
type
FT
case
.
Either
of
the
studs
or
the
mount
-
ing
screws
may
be
utilized
for
grounding
the
relay
.
The
electrical
connections
may
be
made
directly
to
the
terminals
by
means
of
screws
for
steel
panel
mounting
or
to
terminal
studs
furnished
with
the
relay
for
thick
panel
mounting
.
The
terminal
studs
may
be
easily
removed
or
inserted
by
locking
two
nuts
on
the
studs
and
then
turning
the
proper
nut
with
a
wrench
.
The
connector
screw
on
the
terminal
plate
above
the
time
dial
makes
connections
to
various
turns
on
the
oper
-
ating
coil
.
By
placing
the
screw
in
the
various
terminal
plate
holes
,
the
relay
will
respond
to
multiples
of
tap
value
currents
in
accordance
with
the
various
typical
time
-
current
curves
.
The
external
a
-
c
connections
of
the
directional
over
-
current
relays
are
shown
in
Figs
.
21
to
24
.
6
Courtesy of NationalSwitchgear.com

ABB CR Series Specifications

General

Brand	ABB
Model	CR Series
Category	Relays
Language	English