Total Aggregate Power. ABB MicroVersaTrip Plus(tm) and MicroVersaTrip PM (tm) Trip Units

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 3. Metering Mode

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.

Frequency

This display, illustrated in Figure 55, shows the frequency 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 frequency is displayed. If neither are present, this display does not appear.

The frequency is displayed in steps of 1 Hz.

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 display is updated every minute. The power demand display is illustrated in Figure 54.

Figure 55. Trip Unit display for frequency.

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 present demand, hold down the

VALUE

key and press the

SELECT

key.

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