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Next, the waveform of each "wave" event was checked, and 2 types of events were found.
We can assume that the events "switched to a sine wave after the waveform noise" were due to the
switching to the UPS output (stand-by system).
Not switched to a sine wave after the waveform noiseNo.1:
Switched to a sine wave after the waveform noiseNo.2:
It appears that waveform No.1 has a higher noise level and should be switched to the UPS output.
However, waveform No.2 shows a bigger difference in the current waveform when the voltage
waveform shows the noise. Therefore, we can assume that a transient overvoltage occurs
simultaneously when this event occurs. Unfortunately, the transient overvoltage is not detected,
because its threshold is set at 0.480kV (480V).
We propose setting the threshold at 1/2 of the waveform peak (70V= 0.0718kV for 100V circuit)
No.1: Not Switched to the Sine Wave after the Waveform Noise
No.2 Switched to the Sine Wave after the Waveform Noise
Switched to the sine wave
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