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Users Manual

Voltage Dips and Swells

If the voltage passes the upper limit (V

+ 10%) or lower limit (V

– 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

order. These values are averaged over the interval length defined in

PQ Log.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 72 73

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