Figure 303: Functional module diagram
The module diagram illustrates all the phases of the function. Functionality for
phases A, B and C is identical.
All three phases have independent settings.
Level detector
The module compares differential currents I_A calculated by the peak-to-peak
measurement mode to the set
Operate value
. The Timer module is activated if the
differential current exceeds the value of the
Operate value
setting.
Timer
Once activated, Timer activates the START output. The time characteristic is
according to DT. When the operation timer reaches the value set by
Minimum
operate time
, the OPERATE output is activated. If the fault disappears before
the module operates, the reset timer is activated. If the reset timer reaches the
value set by
Reset delay time
, the operation timer resets and the START output is
deactivated.
Timer calculates the start duration START_DUR value, which indicates the
percentage ratio of the start situation and the set operating time. The value is
available in the Monitored data view.
Protection functions
1MRS757644 H
584 620 series
Technical Manual
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