The power supply of equipment is damaged.
Some events were recorded during measurement. A switching waveform, which occurred during the power factor compensation capacitor switching, was detected. This kind of voltage waveform is recorded when a power factor compensation capacitor is installed in a facility. The switching noise comes through the low-voltage circuit without a filtering device.
In addition, a transient (impulse) voltage waveform is detected. This kind of waveform occurs when the voltage waveform is affected by the start-up current of equipment.
Note : To detect intermittent noise, analyzing a voltage waveform distortion event is effective. The voltage waveform distortion event is set as the percentage of the voltage range. A setting from 10% to 15% is recommended.
Source : Guidebook for Power Quality Measurement, HIOKI E.E. Corporation