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Power Quality and Load Analysis

In today’s power-hungry world, quality and reliability is critical. Interruptions, disturbances, and extended power outages can result in equipment damage and lead to unscheduled downtime. To help identify and solve unique power quality issues in a facility, we monitor power quality using guidelines set forth by IEEE-1159-Recommended Practice for Monitoring Electric Power Quality and IEEE-519-Recommended Practice and Requirements for Harmonic Control in Electric Power Systems.  We look for:

  • Transients
    • Impulse
    • Oscillatory
  • Short duration variations
    • Sags
    • Swells
  • Long duration variations
    • Sustained interruptions
    • Under voltage
    • Over voltage
  • Voltage imbalance
    • Unbalanced single phase loads
    • Capacitor bank imbalance
  • Waveform distortion
    • DC offset
    • Harmonics
    • Notching
    • Noise
  • Voltage fluctuations
    • Load variations in power systems
  • Flicker
    • Voltage fluctuation on lighting intensity
  • Power frequency variations
    • Generator speed variations

The National Electric Code (NEC) article 220:87 recommends a 30-day load analysis and demand study before you add more equipment to electrical panels. This information is used to develop a load profile or power quality baseline, and to determine if the additional load to the electrical system could lead to an overload condition. A proper load analysis will help:

  • Identify actual maximum demand to determine existing load
  • Determine available capacity
  • Compare the profile/baseline to any future load or power quality issues

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