GE Industrial Solutions WavePro Low-Voltage Power Circuit Breakers - Manual (Page 34)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 4. Status Mode
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protective relay, the FAULT segment flashes in Setup or
Meter mode. After an overcurrent trip, the FAULT segment
and the appropriate overcurrent target are displayed in all
modes, without blinking, until cleared.
Long-Time Overcurrent Fault Display
After a long-time overcurrent trip, the trip information
display contains the fault current magnitude at trip, the
phase on which the fault occurred, and the overload (
I> )
and long-time ( LT ) trip targets. This display is illustrated
in Figure 53.
Figure 53. Trip Unit Status display for long-time overcurrent trip.
Short-Time Overcurrent Fault Display
After a short-time trip, the status display appears as in Fig-
ure 54. The information presented is similar to that in the
long-time overcurrent display, with the short-circuit (
I>> )
and short-time ( ST ) targets.
Figure 54. Trip Unit status display for short-time overcurrent trip.
Instantaneous Fault Display
The status display for an adjustable instantaneous trip is
illustrated in Figure 55. Because of the fast response of this
function, the Trip Unit displays only the threshold current
for the fault, not the actual fault current nor the phase on
which the fault occurred.
Figure 55. Trip Unit status display for instantaneous overcurrent trip.
Ground-Fault Display
When a ground-fault trip occurs, the display illustrated in
Figure 56 appears. The fault current is displayed in units
of xCT, the breaker CT sensor rating. Multiply the sensor
rating of the breaker by the displayed fault current multi-
plier to obtain the ground-fault current at trip.
Figure 56. Trip Unit status display for ground-fault trip.
Protective-Relay Fault Display
After a protective-relay trip, the display indicates FAULT
with a target for the type of relay that initiated the trip.
This is illustrated in Figure 57 for an overvoltage trip. The
targets for the five protective relays are listed in Table 16.
Figure 57. Trip Unit status display for protective-relay trip.
Code Protective Relay
∆ V Voltage unbalance
∆ I Current unbalance
V< Undervoltage
V> Overvoltage
I
I
Power reversal
Table 16. Trip Unit display targets for protective relays.
Clearing the Trip Information
Since trip information is stored in nonvolatile memory, the
Trip Unit continues displaying the trip information until it
is manually cleared or a new trip occurs. After the trip
information has been recorded or reviewed, it can be
cleared with the keypad. With the Trip Unit in Status
mode, hold down the
VALUE key and press the SELECT
key. The trip information is then cleared and the display
reverts to
STATUS OK , as in Figure 50.