ABB CIRCUIT SHIELD 437W Series User Manual

Reverse
Power
Relay
IB
7.8
.
1.7
-
1
Page
4
437
W
/
437
G
Settings
(
continued
)
Time
Delay
:
The
437
W
/
437
G
series
is
provided
with
a
time
delay
on
pickup
.
An
internal
link
must
be
positioned
to set
the
timing
function
for
a
definite
-
time
characteristic
or
for
an
inverse
characteristic
.
The
definite
delay
on
standard
units is
continuously adjus
-
The
inverse
characteristic
curve
is
shown
in
Figure
6
.
table
from
1
to
30
seconds
.
Relays
with
non
-
standard
delays
will
be marked
appropriately
.
The
time
delay
should
be
set to
the
time
needed
to
prevent
nuisance
operations
due
to
temporary
self
-
correcting
power
reversals
.
A
setting
of
10
-
15
seconds
is
typical
.
4
.
INDICATORS
LED
Pickup
Indicator
:
A
1
ight
-
emitting
-
diode
pickup
indicator
is
provided
to
assist
in
testing
and
to
provide operating
personnel
with
information
on
the
status
of the
relay
.
This
can
be
especially
helpful
when
placing
the
relay
into
service
and
making
initial
settings
.
The
relay
’
s
timer
will
be
timing
when
this indicator
lights
,
and
if
the
condition
persists
,
the
relay
will
operate
.
If
the
indicator
is
flashing
on
and
off
,
system
conditions
are near
the
relay
’
s
operating
threshold
,
however
,
the
timer
is
reset
whenever the
led
goes
out
,
and
a
relay
operation
will
not
occur
.
Target
Indicator
:
When the
relay
’
s
output
contacts
transfer
to
trip
the
breaker
,
the
target
indicator
is
signalled
electronically
to set
and
display
orange
.
The
target
retains
indication
even
on
loss
of control
voltage
,
and
must
be
reset
manually
.
In
order
to reset
the
target
,
control
power
must
be
present
and
the
inputs
to
the
relay
below
pickup
.
APPLICATION
DATA
The
most
common
application
for
ABB
Type
32
R
relays
is
the
reverse
power
(
anti
-
motoring
)
protection
of
a
generator
and
its
prime
-
mover
.
The
maginitude
of
power
required
to
motor
the
generator
varies
widely depending
on
the
type
of
prime
mover
(
diesel
,
gas
turbine
,
etc
.
)
These
relays
provide
wide
sensitivity
ranges
and
high
continuous
ratings
to
allow
full
use
of the
sensitivity
.
Only
one
single
-
phase
relay
is
required
in
this
application
,
as
the
reverse
power
will
be
essentially
equal
in
all
phases
.
A
relay
setting
of
20
-
50
%
of the
power
required
to motor
the
particular
machine
being
protected
is
suggested
,
override
temporary
self
-
correcting
power
synchronizing
,
should
be
set
.
A
time
delay
sufficient
to
reversals
,
such
as
occur
during
A
typical
setting
would be
15
seconds
.
Catalog
Series
237
P
/
237
F
/
437
P
/
437
F
:
Relays
in
this series
are
current
-
directional
relays
,
rather
than
true
power
measurement
types
.
The
operating
characteristic
is
shown
in
Figure
5
.
An
advantage
of
this
type
of
unit is
that
its
sensitivity
to current
magnitude
and
direction
does
not
change
with
the
magnitude
of
polarization
voltage
.
Although
the normal
polarization
voltage
to
the
relay
is
120
vac
,
the
relay
will
be
fully
polarized
at
voltages
down
below
10
volts
.
An
internal
phase
-
shift
circuit
provides
the
30
degree
shift
required
so
the
line
-
to
-
line
polarization
voltage
can
be
properly
compared
in
phase
to
the
line
current
.
(
If
the
phase
A
-
to
-
neutral
voltage
is
used
,
the
internal
phase
-
shift
link
should be
set
to
0
°
,
rather
than
30
°
.
)
For
unity
power
factor
conditions
,
the three
-
phase
kilowatts
to
cause
relay
operation
can
be
estimated
by
the
following
calculation
:
/
3
*
V
*
I
*
N
where
KW
V
=
system
line
to
line
voltage
in
kilovolts
.
I
=
relay
pickup
setting
in
amperes
.
CT
ratio
.
N
An
adjustable
definite
-
time
delay
characteristic
with
a
range
of
1
to
30
seconds
is
provided
on
standard
units
.
For
unusual
applications
,
special
time
ranges
including
instantaneous
operation
can
be
provided
.
Contact
the
factory
.
Reverse
VAR
Detection
:
If
this
model
is
connected
as
shown
in
Figure
4
,
and
set
-
up
with
an
internal
0
°
phase
-
shift
,
it
becomes
a
reverse var
detector
,
used
for loss
-
of
-
field
protection
in
installations
where the
cost
of
an
impedance
type
relay
,
such
as
the
ABB
Type
40
,
can
not
be
justified
,
application
.
Catalog
series
437
W
/
437
G
units
are now
preferred
for
this
Courtesy of NationalSwitchgear.com

ABB CIRCUIT SHIELD 437W Series Specifications

General

Brand	ABB
Model	CIRCUIT SHIELD 437W Series
Category	Relays
Language	English