13.2 Input Specifications/Output Specifications/Measurement Specifications
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13
Chapter 13 Specifications
(21) Reactive power (Q)
Measurement method Calculated using apparent power S and active power P.
Lag phase (LAG: current lags voltage): Unsigned
Lead phase (LEAD: current leads voltage): Negative
Displayed item Reactive power of each channel and its sum for multiple channels. (For details, see "13.8 Calcu-
lation Formula" (p.231)
.)
Measurement range Depends on the voltage × current range combination
(See "13.9 Range Breakdown and Combination Accuracy" (p.244)
)
Measurement accuracy ±1 dgt. for calculations derived from the various measurement values (sum is ±3 dgt.)
Event threshold Power range (specified as absolute value)
Event IN Start of approx. 200 ms aggregation in which the absolute value was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
following the EVENT IN state
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
(22) Power factor and displacement power factor (PF, DPF)
Measurement method Power factor : Calculated from RMS voltage U, RMS current I, and
active power P.
Displacement power factor : Calculated from the phase difference between the
f
undamental voltage wave and the fundamental cur-
rent wave.
Lag phase (LAG: current lags voltage) : Unsigned
Lead phase (LEAD: current leads voltage) : Negative
Displayed item Power factor and displacement power factor of each channel and its sum value for multiple chan-
nels. (For details, see "13.8 Calculation Formula" (p.231)
.)
Measurement range -1.0000 (lead) to 0.0000 to 1.0000 (lag)
Displacement power factor
measurement accuracy
For voltage of 100 V or greater and current input greater than or equal to 10% of the range:
When displacement power factor = 1: ±0.05% rdg.
When 0.8
≤displacement power factor<1: ±1.50% rdg.
When 0<displacement power factor<0.8: ±(1 - cos(φ + 0.2865)
/cos(φ))×100% rdg. + 50 dgt. (ref-
erence value)
φ: D
isplay value for 1st order harmonic voltage/current phase difference
In all cases, add current sensor's phase accuracy.
Event threshold 0.000 to 1.000 (specified as absolute value)
Event IN Start of approx. 200 ms aggregation in which the absolute value was less than the threshold
Event OUT Start of the approx. 200 ms aggregation in which the reading was greater than (absolute value +
hysteresis) following the EVENT IN state
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
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