Instantaneous Pickup; High-Range Instantaneous Overcurrent Protection; Ground-Fault Pickup - GE MicroVersaTrip Plus Series User Manual

2.

Instantaneous Pickup

Instantaneous overcurrent protection, with Trip Unit
display illustrated in Figure 19, causes an immediate
breaker trip when the chosen current level is
reached. The pickup value may be set in steps of 0.5
from 1 .5 to a maximum dependent on the
xln xln
frame size and the presence of the short-time
function, as listed in Table 13.
Note the difference from short-time pickup, which is
based on a multiple of
teristic is shown in Figure 20.
INST
Figure 19. Trip Unit display for instantaneous pickup.
Q)
E
f.=
Current
Figure 20. Instantaneous overcurrent protection set point.
Frame Max. Setpoints
Amp Rating Without ST
2000 1 .5-1 0.0
3200 1 .5-10.0
4000 1 .5-9.0
5000 1 .5-7.0
Table 13. Instantaneous pickup settings for various frame sizes
with and without the short-time function.
The time-current charac­
xLT.
SETUP
xln
PI C KUP
I nstantaneous
Pickup Setting
Setpoints
With ST
1 .5-15.0
xln
1 .5-1 3.0
xln
1 .5-9.0
xln
xln 1 .5-7.0
On Trip Units with the user-selectable switchable
instantaneous overcurrent and ground-fault option,
X, an additional value of
the listing of numerical values. Choose this setting to
disable instantaneous protection. The instantaneous
selection is interlocked with short-time pickup,
OFF
so that only one function can be turned off at a time.
High-Range Instantaneous Overcurrent
Protection

High-range instantaneous overcurrent protection

has a fixed trip setting equal to the breaker frame's
short-time withstand rating,
+0%, -20%. When this option is installed, skip pro­
gramming of instantaneous pickup and go on to the
next function by pressing

Ground-Fault Pickup

The trip unit display for ground-fault pickup is
shown in Figure 21 . This function sets the pickup
current for ground-fault protection. The available
settings are listed in Table 1 4 as multiples of
current sensor rating, in steps of 0.01
mum value is limited to 1 200 A. Figure 22 illustrates
the time-current curve for ground-fault pickup.
, . ,
.C Lf
Figure 21. Trip Unit display for ground-fault pickup.
Sensor , A
xln
2500-3200
xln
xln
Table 14. Ground-fault pickup settings, as a function of sensor
xln
18
OFF appears at the end of
H, with pickup tolerance
S E LECT .
xCT.
xCT
GF
PI C KUP
Set Points
1 50-2000 0.20-0.60
0.20-0.37
4000 0.20-0.30
rating.
the
xCT
The maxi­
SETUP