Appendix 3 Event Detection Methods
A
12
Inrush current
Measurement method:
• Events are detected when the RMS current refreshed each half-cycle Irms1/2 is greater than the threshold.
• For 400 Hz measurement, events are detected when the maximum of 4 RMS current values existing within the same
10 ms period (calculated values for one 400 Hz waveform) is greater than the threshold in the positive direction.
Event IN and OUT:
Event IN : Time of start of channel half-cycle voltage waveform in which the RMS current refreshed each half-cycle
was greater than the threshold.
Event OUT : Time at the start of the voltage half-cycle waveform in which the RMS current refreshed each half-cycle ex-
ceeded (threshold - hysteresis) in the negative direction
Thresh-
old
Hysteresis
Irms1/2
EVENT
IN
EVENT
OUT
0.5 s 29.5 s
RMS current refreshed each half-cycle Irms1/2 values are saved from
0.5 s before the event to 29.5 s after the event as fluctuation data.
Event IN
Event OUT
Current waveform
Voltage waveform
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