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Demand:
This meter consists of several types of demand calculation: total active power
demand, total reactive power demand, total apparent power demand, phase A
current demand, phase B current demand, and phase C current demand. When
demand is reset, demand memory registers are set as 0.
Demand calculating mode can be set as sliding window and thermal according
to user. The Fig 4-7 shows how it works.
When using the sliding window interval method, user selects an interval from
1 to 30 minutes, which is the period of the calculation. The demand updates
every 1 minute as the window slides once.
Thermal demand method calculates the demand based on a thermal response
which mimics a thermal demand meter. User selects the period for the
calculation and the demand updates at the end of each period.
Energy:
This meter measures and accumulates energy in dierent directions (import and
export). For real-time energy monitoring, it accumulates energy for kWh, kvarh
and kVAh continuous (since its last reset).
Calculating mode
1. User can select different energy calculating modes, fundamental based or
full-wave based either from the meter front or via communication. Fundamental
based calculating is used to accumulate energy without taking harmonics into
consideration while full-wave based calculating is used to accumulate energy
including fundamental and harmonics.
Note: 1)When fundamental based calculating mode is selected, PF calculation
will be based on the fundamental wave.
2)When selecting 400Hz type,only support full-wave.
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