Trip Unit Status Display For Ground-Fault Trip; Trip Unit Status Display For Protective-Relay Trip; Trip Unit Status Display For Undervoltage Release Trip; Trip Unit Display Targets For Protective Relays - GE MicroVersaTrip Plus User Manual

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Ground-Fault Display
When a ground-fault trip occurs, the display illus-
trated in Figure 62 appears. The fault current is dis-
played in units of xCT , the breaker CT sensor rating.
Multiply the sensor rating of the breaker by the dis-
played fault current multiplier to obtain the ground-
fault current at trip.
Figure 62. Trip Unit status display for ground-fault trip.
Protective-Relay Fault Display
After a protective-relay trip, the display indicates
with a target for the type of relay that initiated
FAULT
the trip. This is illustrated in Figure 63 for an
overvoltage trip. The targets for the five protective
relays are listed in Table 18.
Figure 63. Trip Unit status display for protective-relay trip.
C C C C o o o o d d d d e e e e P P P P r r r r o o o o t t t t e e e e c c c c t t t t i i i i v v v v e e e e R R R R e e e e l l l l a a a a y y y y
∆
Voltage unbalance
V
∆I
Current unbalance
< Undervoltage
V
> Overvoltage
V
Power reversal
I
I
Table 18. Trip Unit display targets for protective relays.
Shunt Trip and Undervoltage Release Trip
Displays (RMS9D Series Trip Units Only)
When a Power Break ®II breaker trips due to the
Shunt Trip, Shunt Trip with Lockout, or
Undervoltage Release, the display indicates the trip
with a flashing target, as illustrated in Figure 64. The
indications and
ST
Undervoltage Release trips, respectively. Note that
the segment does not display, since the trip
FAULT
originated external to the breaker and may not
represent a true fault condition.
Figure 64. Trip Unit status display for Undervoltage Release
Clearing the Trip Information
Since trip information is stored in nonvolatile mem-
ory, 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
key and press the
SELECT
then cleared and the display reverts to
in Figure 56.
Trip Operations Counter Display
Trip operations counters record the total number of
overcurrent trips. To review any of the trip opera-
tions counters while in Status mode, press the
key until the desired count appears. Figure 65
illustrates a typical trip operations counter display.
This example indicates that there have been three
long-time trips on this breaker since the counter was
last reset.
31
Chapter 4. Status Mode
appear for Shunt Trip and
UVR
trip.
key. The trip information is
STATUS OK
VALUE
, as
SELECT