13.2 Input Specifications/Output Specifications/Measurement Specifications
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Chapter 13 Specifications
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(4) Inrush current ( Inrush, Irms1/2 )
Measurement method Compliant with IEC61000-4-30
When the measurement frequency is set to 50 Hz or 60 Hz, the current RMS value is calculated
from
data sampled from a current waveform at intervals of half cycle (in synchronization with volt-
age waveform acquired across the same channel) and the inrush current is detected.
When the measurement frequency is set to 400 Hz, the current RMS value is calculated for each
current waveform, and the inrush current is detected if the greatest of four current RMS values (400
Hz single-waveform calculated values) in a 10 ms interval exceeds the threshold.
Displayed item The maximum current of RMS current refreshed each half-cycle
Measurement range Varies with sensor used (see input specifications).
Measurement accuracy When the measurement frequency is set to 50 Hz or 60 Hz :
±0.3%
rdg.±0.5% f.s. + current sensor accuracy
When the measurement frequency is set to 400 Hz :
±0.4% rdg.±
1.0% f.s. +current sensor accuracy
Event threshold Varies with set range.
Event IN Time at the start of each channel's voltage half-cycle waveform for which the RMS current re-
freshed each half-cycle exceeded the threshold
Event OUT Time at the start of the voltage half-cycle waveform in which the RMS current refreshed each half-
cycle fallen below the value calculated by subtracting the hysteresis from the threshold
Multiple-phase system treatment None
Saved waveforms Event waveforms
Fluctuation data Saves the data of RMS voltage refreshed each half-cycle and RMS current refreshed each half-
cycle obtained in the period between 0.5 sec prior to the event IN and 29.5 sec after the event IN.
When set to 400 Hz, saves the data of RMS voltage refreshed each half-cycle and RMS current
refr
eshed each half-cycle obtained in the period between 0.125 sec prior to the event IN and 7.375
sec after the event IN.
(5) Swell (Swell)
Measurement method Compliant with IEC61000-4-30
During 50 Hz/60 Hz measurement, a swell is detected w
hen the RMS voltage refreshed each half-
cycle exceeds the threshold in the positive direction.
During 400 Hz measurement, a swell is detected when
the maximum of 4 RMS voltage values oc-
curring within 10 ms (values calculated for one 400 Hz waveform) exceeds the threshold.
Displayed item Swell height: Worst value for RMS voltage refreshed each half-cycle [V]
Swell duration: Period from the time a U1 to U3 swell is detected until the reading falls below the
value calculated by subtracting the hysteresis from the threshold
Measurement range 600.00 V
Measurement accuracy Same as for RMS voltage refreshed each half-cycle
Period: Within half a cycle of the start accuracy time, within half a cycle of the end accuracy time
(not specified for 400 Hz measurement)
Event threshold Percentage of the nominal voltage or percentage of the slide reference voltage (user-selectable)
Event IN Start of the waveform for which the RMS voltage refreshed each half-cycle exceeded the threshold
in the positive direction
Event OUT Start of the waveform for which the RMS voltage refreshed each half-cycle fallen below the value
calculated by subtracting the hysteresis from the threshold
Multiple-phase system treatment Starts when any of the U1 to U3 channels experiences a swell and ends when the swell has ended
for all channels.
Saved waveforms Event waveforms
Fluctuation data Saves the data of RMS voltage refreshed each half-cycle and RMS current refreshed each half-
cycle obtained in the period between 0.5 sec prior to the event IN and 29.5 sec after the event IN.
When set to 400 Hz, saves the data of RMS voltage refreshed each half-cycle and RMS current
refr
eshed each half-cycle obtained in the period between 0.125 sec prior to the event IN and 7.375
sec after the event IN.
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