User Manual, PRIOR to Firmware rev. 3.0 Owner manual

Publication 1404-UM001D-EN-E - October 2004
Powermonitor 3000 Operations 3-11
First Order Projection
The first order demand projection utilizes the instantaneous demand
as a starting point, computes the trend of the instantaneous demand,
computes the time remaining in the interval, and performs a first order
projection of what the final demand will be at the end of the interval.
This method may be useful where your system has a significant base
load with additional loads that are switched in and out during the
interval.
Second Order Projection
The second order demand projection begins with the first order
projection. It computes the rate of change of the first order trend,
computes the time remaining in the interval, and performs a second
order projection of what the final demand will be at the end of the
interval. This method may be useful where your power system has
little or no base load and a load profile that increases over the
duration of the interval. A second order projection is more sensitive to
rapid load changes than the other methods.
Demand
1
t2 t1–
----------------
Pt()td
t1
t2
∫
•=
(t2 - t1) = Elapsed interval duration and is less than T
Table 3.5 Energy and Demand Results
Parameter Description Range Units
Kilo-Watt Hours Forward The total real power consumed
0 to 1.0x10
12
kWh
Kilo-Watt Hours Reverse The total real power produced
Kilo-Watt Hours Net The sum of forward and reverse power
Kilo-VAR Hours Forward The total reactive power consumed
0 to 1.0x10
12
kVARh
Kilo-VAR Hours Reverse The total reactive power produced
Kilo-VAR Hours Net The sum of forward and reverse reactive power
Kilo-VA Hours Net The total apparent power consumed
0 to 1.0x10
12
kVAh
Amp Hours Net Accumulated amp-hours consumed.
0 to 1.0x10
12
Ah
Demand Current The calculated demand for average current.
0 to 999.9x10
21
Amps
Max Demand Current The maximum (peak) demand for current.
(included in Min/Max Log)
Demand Kilo-Watts The calculated demand for real power.
0 to 999.9x10
21
kW
Max Demand Kilo-Watts The maximum (peak) demand for real power
(included in Min/Max Log)