Nelson Engineering Co. performs Power Quality and Harmonic Analyses for a variety of customers including the Department of Energy (DOE) National Energy Technology Laboratories (NETL) and Defense Information Systems Agency (DISA) computer centers. The electrical power distribution systems are surveyed and modeled identifying common harmonic sources including:
Variable Frequency Drives (VFDs)
Static VAR Compensators
Power Factor Correction Capacitors
Switch Mode Power Supplies commonly used in modern electronics power supplies
Field verification measurements of harmonics and overall power quality are performed. The results are analyzed and interpreted to provide harmonic metering data and graphs as well as spectrum and waveform plots of the distortion. Spikes, surges, and variations in voltage and frequency are also analyzed to determine overall power quality in different system configurations. Issues with power quality are identified with possible sources and recommendations for correction.