What the Eagle™ Records
••••
62
What is Recorded
When a flicker record is created, the date and time are recorded,
along with the number of voltage events that exceeded the
tolerance. The time span over which the flicker occurred is also
recorded. Each channel is reported separately.
Typical Settings and Suggested Uses
The flicker report is designed to show whether utility customers
will perceive voltage variations as flickering lights. The default
curve is programmed to generate flicker events when a person
would become irritated by the level of flicker. The IEEE also has a
curve that shows when a person would just perceive flickering
lights, but not become irritated. The validity of these curves
depends on individual circumstances such as lighting (the curves
assume 120V incandescent) and customer sensitivity. The flicker
report is used both to confirm a customer complaint about
flickering lights, and to measure progress in mitigating a problem.
If no flicker events were recorded, then no voltage variations
occurred which exceeded the allowed limits, and the problem may
have been solved. Since flickering light perception is so
subjective, merely showing a customer a flicker report that shows
no flicker according to a standard curve may lessen the complaint
by showing that the voltage variations are within standard limits.
If flicker memory is filled, flicker recording stops. The amount of
memory used for flicker is different for various PMI recorders, but
every Eagle can record over one thousand records.
Abnormal Voltage
The abnormal voltage record type shows if the average line
voltage moved past a low or high threshold from the nominal
voltage. When the trigger occurs, the event is time stamped to the
nearest second.