Figure 342: Behavior of different IDMT reset modes
Figure 342
shows the operate signal based on settings Type of reset curve = “Def
time reset” and Type of time reset= “Freeze Op timer”. The effect of other reset
modes is also presented.
The
Time multiplier
setting is used for scaling the IDMT operate times.
The
Minimum operate time
setting parameter defines the minimum desired
operate time for IDMT. The setting is applicable only when the IDMT curves are
used.
The
Minimum operate time
setting should be used with care because the
operation time is according to the IDMT curve, but always at least the
value of the
Minimum operate time
setting. For more information, see
the IDMT curves for overcurrent protection section in this manual.
The Timer calculates the start duration value START_DUR which indicates the
percentage ratio of the start situation and the set operate time. The value is
available in the Monitored data view.
Protection functions
1MRS757644 H
656 620 series
Technical Manual
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