IBA PQU-S, Руководство пользователя, Страница: 83 / 116

Manual
Issue 1.3
83
The input signals that match the selected function are displayed in green.
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Unit
The unit is inserted automatically.
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Active
Here you can enable or disable the signal.
Special considerations for grids with user-defined nominal frequencies
In addition to grids with 50 Hz and 60 Hz nominal frequency, ibaPQU-S also allows taking
measurements in grids with a user-defined frequency. If a user-defined power frequency
is set (in the PQU-S module), this will influence the length of the 200 ms measurement
interval and the naming in the Aggregation submodule.
With a 200 ms interval, exactly 10 periods are measured in 50 Hz grids and 12 periods
in 60 Hz grids, equivalent to exactly 200 ms.
With user-defined power frequencies, 10 or 12 periods are measured accordingly: 10
periods for power frequencies ≥ 10 Hz and < 51 Hz, and 12 periods for power frequencies
≥ 51 Hz and < 80 Hz.
For the set power frequency, the interval time is then calculated for 10 or 12 periods.
Example:
If 16.7 Hz power frequency is set, 10 periods are measured. The measurement interval
is calculated for 10 periods and is 598.8 ms.
The interval of 598.8 ms is then also displayed in the dropdown menu and replaces the
200 ms interval.
The calculated measurement interval also determines the module name.