GE MDP

GEK
-
100682
MDP
DIGITAL
TIME
OVERCURRENT
RELAYING
SYSTEM
PRODUCT
DESCRIPTION
Phase
and
ground
current
metering
;
Operating
time
and
fault
current
of
the
last
trip
.
MDP
relays
digital
,
Type
microprocessor
-
based
,
non
-
directiona
!
overcurrent
relays
that
protect
against
phase
-
to
-
phase
and
phase
-
to
-
ground
faults
.
are
Breaker
status
•
v
>
:
'
Breaker
operation
(
RS
232
and
RS
485
versions
only
)
The
MDP
relay
performs
the
following
functions
:
The
MDP
series
relays
include
four
measuring
units
,
one
for
each
of
the
three
phase
currents
and
an
additional
one
for
ground
or
residual
current
,
Each
of
the
four
measuring
units
includes
a
time
and
an
instantaneous
overcurrent
unit
.
The
phase
settings
arc
combined
so
that
all
phase
units
are
set
the
same
.
Inverse
overcurrent
,
including
four
characteristic
curves
,
and
four
values
of
definite
time
protection
,
as
well
as
instantaneous
overcurrent
protection
with
programmable
delay
;
Phase
and
ground
current
measurement
;
CURRENT
RANGES
Nominal
Current
Inverse
Time
Unit
Instantaneous
unit
«
*
(
In
)
(
Is
)
Ground
1
,
5
to
13
,
125
Amps
0.5
to
4.375
Amps
0.1
to
0.875
Amps
Phase
5
Amp
Nominal
1.5
-
13.125
Amps
0.5
-
4.375
Amps
1
to
31
x
Is
(
All
Relays
)
0.5
-
4.375
Amps
0.3
to
2.625
Amps
0.1
to
0.875
Amps
0.05
to
0.4375
Amps
(
'
A
AMP
CT
)
1
Amp
Nominal
0.3
-
2.625
Amps
£
V
-
The
pickup
value
for
the
instantaneous
unit
can
be
adjusted
between
1
and
31
times
the
value
selected
for
the
inverse
-
time
unit
.
produced
(
A
)
by
an
instantaneous
unit
or
an
inverse
unit
,
or
(
B
)
by
phase
or
ground
.
That
selection
is
made
by
means
of
a
switch
behind
the
right
lower
side
of
the
nameplate
.
An
alarm
output
is
provided
,
to
signal
a
critical
alarm
such
as
power
-
supply
failure
or
self
-
check
failure
.
An
output
contact
is
provided
to
close
the
breaker
from
a
command
issued
via
the
Communications
Channel
.
The
instantaneous
unit
can
be
disabled
by
adjusting
the
setting
to
zero
(
0
)
times
the
inverse
value
.
The
MDP
relay
has
two
trip
output
relays
,
which
can
be
selected
to
indicate
whether
a
trip
has
been
©
4
Courtesy of NationalSwitchgear.com