GE MicroVersaTrip Plus - Page 24

5
Micro
Versa
Trip
®
Plus
and
Micro
Versa
Trip
®
PM
Trip
Units
Chapter
2
.
Setup
Mode
Ground
-
Fault
Delay
This
function
sets
the
delay
before
the
breaker
trips
when
the
ground
-
fault
pickup
current
has
been
detected
.
The
trip
unit
display
is
shown
in
Figure
20
.
The
choices
are
listed
in
Table
11
.
The
delay
for
I
2
T
OUT
is
at
the
lower
limit
of
each
band
.
The
delay
for
I
2
T
IN
is
at
200
%
of
the
pickup
setting
at
the
lower
limit
of
the
band
.
Delay
Set
Points
with
l
2
T
IN
<
D
£
/
\
SETUP
c
Current
Figure
22
.
Time
-
current
curve
for
ground
-
fault
delay
with
l
2
T
IN
.
I
2
T
OUT
GF
With
the
X
option
(
switchable
ground
fault
)
,
an
OFF
selection
appears
as
an
additional
time
-
delay
set
point
,
Selecting
OFF
disables
ground
-
fault
protec
-
tion
.
DELAY
Figure
20
.
Trip
unit
display
for
ground
-
fault
delay
.
Band
Time
Delay
,
sec
Voltage
-
Unbalance
Relay
Pickup
This
function
compares
the
highest
or
lowest
phase
voltage
with
the
voltages
of
the
other
two
phases
and
initiates
a
trip
if
the
difference
exceeds
the
set
point
.
The
true
rms
voltage
is
computed
for
each
phase
.
The
range
of
set
points
is
from
10
to
50
%
,
with
an
increment
of
1
%
.
The
trip
unit
display
is
shown
in
0.10
1
0.21
2
0.35
3
Table
11
.
Nominal
delays
for
ground
-
fault
delay
bands
.
The
I
2
T
OUT
function
establishes
a
constant
time
delay
,
as
shown
in
Figure
21.12
T
IN
biases
the
delay
Figure
23
.
with
a
constant
slope
,
as
shown
in
Figure
22
,
SETUP
Delay
Set
Points
with
l
2
T
OUT
VU
PICKUP
<
n
z
£
Figure
23
.
Trip
unit
display
for
voltage
-
unbalance
relay
pickup
,
\
-
Voltage
-
Unbalance
Relay
Delay
This
function
sets
the
delay
time
before
a
voltage
-
unbalance
trip
occurs
.
The
range
of
delays
is
1
to
15
seconds
,
in
steps
of
1
second
.
Choosing
OFF
disables
Figure
21
.
Time
-
current
curve
for
ground
-
fault
delay
with
l
2
T
voltage
-
unbalance
protection
.
The
trip
unit
display
is
shown
in
Figure
24
.
Current
OUT
.
%
16
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