Overview of MPQ1000
MPQ1000-UG-EN Rev 6 April 2020
9
Vars
A unit which is the imaginary counterpart of the watt. The relationship
between a VAR and a watt in an alternating-current electrical system is
determined by the power factor.
Volt Amps
A measurement of apparent power.
Watts
A unit of energy equivalent to one joule per second.
Waveform
Capture
A selection in the MPQ1000 setup file that allows the unit to record sample by
sample data of each waveform for both Current and Electric Field. A
waveform will be captured once every storage interval. Note: This feature
must be enabled in order to calculate THD and Harmonics.
Calculations
RMS Calculation:
Voltage and Current Waveform Data
Waveform Sample = Binary Value * Slope*Cal offset
Calculation of a sliding reference voltage (First-order filter with a 1-min time constant)
Usr(n) = 0.9967 x Usr(n–1) + 0.0033 x U(10/12)rms
Where:
U
sr(
n
)
is the present value of the sliding reference voltage;
U
sr(
n
–1)
is the previous value of the sliding reference voltage; and
U
(10/12)rms
is the most recent 10/12-cycle r.m.s. value.
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