15
Introduction
Power Quality Recorder SICAM Q80 7KG8080, System manual
E50417-H1076-C420-A2, Release 12.01.2015
3.2.4
Events
Typical courses of the voltage RMS-value which can be characterized by the duration and depth1 of the amplitude,
are recorded by
SICAM Q80 7KG8080
as events.
Fig 3-2 Event with duration and magnitude
The curve plots of the RMS-values serve as the source for the capture of events. While the deviation of the RMS-
value in
one direction
leads to the recording of a data point in a reduced curve plot, an event is always defined by
two transitions
: one from the normal voltage level to the fault level one another one back to the normal level.
The duration of an event is measured between two departure points, in other words at the amplitude setpoint. The
magnitude of the event is determined from the minimum or maximum amplitude in the disturbance region. This is
done in the assumption that the amplitude remains relatively constant during the disturbance.
According to currently valid standards, every deviation of >10% form the nominal voltage counts as an event.
Depending on the duration and amplitude, distinctions are made between sags and outages.
1
For overvoltage, depth is the same as height.
3.2.5
Signal voltage (ripple control signals)
Signal voltage refers to a signal superimposed onto the supply voltage, which is used to communicate information.
The most familiar example is so-called ripple control signals.
SICAM Q80 7KG8080
has three special channels, each with different time resolution, for monitoring signal voltages.
1. In addition to the harmonics and interharmonics, the mean voltage level at signal frequency is also recorded.
2. The RMS-value of the spectral line of the FFT corresponding to the signal frequency is recorded with data
reduction.