Swells or over-voltages are the reverse of a sag and has increased AC voltage for a duration of 0.5 cycles to one minute of time. Much like sags, the condition is hard to detect without effective instrumentation, so the problem is typically ignored or not diagnosed. Typically, it is caused by sudden large load reductions and a single-phase fault on a three-phase system as well as a loose neutral.

Often the results of the swell show up as data errors, flickering lights, electrical contact degradation, semiconductor damage and insulation damage, all of which can cause catastrophic results in the plant. As opposed to sags, swells can actually destroy electronic equipment and drives.

MachineSense identifies these surges or over-voltages so you can understand what’s happening within your electrical circuit. With this information, you can easily understand the components that are causing the condition and rectify the problem.