An Electromagnetic Interference Analysis of Uninterruptible Power Supply Systems in a Data Processing Environment

Abstract

The levels of Electromagnetic Interference (EMI) generated by two standard models of Uninterruptible Power Supplies (UPS) were examined. Conducted current measurements were made on all conductors exiting and entering two standard UPS units between the frequency range of 60-Hz up to 50 MHz. EMI reduction actions were undertaken on both units, and the reduction in EMI current resulting from these actions was determined. The before and after mitigation results were compared with EMI limits suggested by available specifications, standards, and other related documents. The results show that a significant reduction in the level of EMI can be achieved in low-to-modest size UPSs using inexpensive, standard, and commercially available filters, provided the filters are installed in an effective manner. The reduction of EMI to harmless levels at radio-receiving and data-processing sites is shown to be feasible.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2002
Accession Number
ADA411197

Entities

People

  • Edward W. Beran

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bandwidth
  • Battery Chargers
  • Data Processing
  • Data Processing Equipment
  • Detectors
  • Electrical Engineering
  • Electrical Equipment
  • Electromagnetic Interference
  • Electronic Components
  • Electronic Equipment
  • Measurement
  • Power Supplies
  • Processing Equipment
  • Radio Frequency
  • Test And Evaluation
  • Time
  • Uninterruptible Power Supplies

Readers

  • Electrical Engineering
  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Systems Analysis and Design