Abstract
If you were to ask a handful of customers what they consider a ‘power surge’ to be, you would get a multitude of answers — anything from a lightning strike to the lights flickering off briefly, to the lights getting brighter for a moment before returning to normal. This last symptom is caused by the topic of this paper: Voltage Swells. Utilities tend to log far more sag reports than swells, though swells can stress equipment in ways that a sag never could.