Progress Energy  
 
Power Quality Tool

Power quality events are classified by duration and severity of voltage variance from nominal. Click on the appropriate area on the graph to learn more about power quality events and how they are classified.
Long Term Duration Variety Short Term Duration Variety Transient Duration Variety
Power quality events lasting longer than three (3) minutes are referred to as steady-state conditions. Common steady-state conditions include:

     Flicker
     Frequency Variations
     Harmonics
     Noise
     Notching
     Voltage Unbalance


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