GE Industrial Solutions MicroVersaTrip PM - Manual (Page 38)

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 3. Metering Mode
28
Total Apparent Power
The value displayed for total apparent power, as
illustrated in Figure 53, represents the aggregate
total apparent power in volt-amperes flowing
through all three phases. The value is displayed from
0 to 999 kVA, then automatically switches units to
display 1.00 to 999 MVA.
Figure 53. Trip Unit display for aggregate apparent power.
Power Demand
Power demand is the average of total power over the
selected interval (5, 10, …, 55, 60 minutes). This dis-
play is updated every minute. The power demand
display is illustrated in Figure 54.
Figure 54. Trip Unit display for power demand.
Peak Power Demand
Peak power demand is stored in nonvolatile memory.
Every minute, the power demand is calculated and
compared against the stored peak power demand. If
the new power demand is greater than the stored
peak demand, the Trip Unit stores the new power
demand as the peak value. The display of peak
power demand is identical to the display illustrated
in Figure 54, except that the units segment (in this
case, MW) flashes.
Peak demand is stored in nonvolatile memory. The
value in the display can be reset through the Trip
Unit keypad. To reset the peak demand to the pres-
ent demand, hold down the
VALUE key and press the
SELECT key.
Frequency
This display, illustrated in Figure 55, shows the fre-
quency of the line current. Either line voltage or
current must be present for this display to appear.
The frequency is calculated from the current and
voltage signals. If both are present, the voltage fre-
quency is displayed. If neither are present, this dis-
play does not appear.
The frequency is displayed in steps of 1 Hz.
Figure 55. Trip Unit display for frequency.