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CASE STUDY 4
Switching of Power Factor Correction Capacitor
Environment:
Problem:
Analysis:
Target: 1-phase 2-wire, 100V circuit
The power supply of equipment is damaged.
Some events are recorded by measurement.
The switching waveform, which occurs during the power factor correction capacitor switching, is
detected. This kind of voltage waveform is recorded when the power factor correction capacitor is
installed in a facility. The switching noise comes through the low-voltage circuit without a filtering
device.
Voltage Noise Waveform 1 (By the voltage waveform distortion event)
Also, 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.
Voltage Noise Waveform 2 (By the voltage waveform distortion event)
To detect intermittent noise, the 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.
Note:
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