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CH 4/ Setup Monitoring
Timed Intervals
Introduction
The Timed Intervals screen allows you to define how often HDPQ Xplorer saves data
periodically, regardless of power quality disturbances and journal limits.
Definitions
Power Values
Power Values Interval - Power parameter values are based upon all cycles during a one
second interval. Data is aggregated or summarized into min, max and avg values over
the averaging period and stored at the end of the interval. Data measured include watts,
power factors, as well as the one-second rms for voltage and current, which can be used
instead of one cycle data. Cyclic min, max and avg are based upon full cycle
waveforms with a resolution of one half (1/2) cycle for voltage and current. Note that if
you did not set the thresholds for rms variations properly, the min, max and avg will
still provide a record of what happened during the interval.
Waveform Snapshot- Contains properties that measure periodic sample or snapshot of
the voltage and/or current waveform. You can determine how often the instrument will
record waveform snapshots by checking/unchecking the box to turn function on or off.
Demand and Energy
Demand Sub-Interval and Demand Interval - Refer to the time interval used in
calculating power demand values. Demand calculations are made every sub-interval on
the values that occurred during the most recent Demand Interval. Values set for
Demand Sub-Interval must be an integer-divisor of the Demand Interval since the
former applies when updating certain parameters of the latter.
Harmonics
Harmonics Journal Interval - Various harmonic parameters such as total harmonic
distortion (THD), total interharmonic distortion (TID), and telephone influence factor
(TIF) can be trended using periodic readings that are stored in the journal. Depending
on the harmonic journal interval set, the instrument records a sampling of the waveform
synchronized to the fundamental frequency, to ensure accurate calculation of harmonic
phase angles.
Flicker
Pst (Short Term) Interval - Pst is short term perceptibility, used to set the Pst calculation
interval. Typical calculation is over a 10-minute interval, though you can specify Pst
Interval under Flicker.
Plt (Long Term) Interval - Plt is long term perceptibility, used to set the Plt calculation
interval. Typical calculation is over a 2-hour interval, though you can specify Plt
Interval under Flicker.
The Plt interval must be an integer multiple of the Pst interval. Sliding Plt recalculates
the Plt value at each Pst interval, rather than only at the Plt interval.
Shop for Power Metering products online at:
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www.PowerMeterStore.com
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