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This paper presents an analytical description of voltage sag types along with the actual and calculated performance data for UST’s SagFighter.™

  • A voltage sag is the drop below 90% of the RMS voltage on a power system for a duration of time ranging from a cycle of the AC voltage to a minute.
  • A voltage sag lasting only 100 milliseconds can cause a shut-down of equipment in a manufacturing process leading to hours of down time and lost revenue.
  • This paper details the performance of SagFighter for single-phase, two-phase and three-phase sags.