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Users Manual
32
Voltage Dips and Swells
If the voltage passes the upper limit (V
N
+ 10%) or lower limit (V
N
– 10%), the
event is registered as a voltage swell or dip, respectively (thresholds are
adjustable in PQ Log).
The duration, time, and extreme value of the dip or swell is also recorded.
Zeit
Time
90% Un
Duration
Depth
Heigth
Duration
100% Un
110% Un
egb019.eps
Figure 16. Voltage Dips and Swells
Voltage Harmonics
Voltage harmonics are defined as voltage components that have a frequency
that is an integer multiple of the fundamental frequency of the line power
voltage. Logging function A records each individual voltage harmonic, up to
the 50
th
order. These values are averaged over the interval length defined in
PQ Log.