Figure 211: Behavior of different IDMT reset modes. Operate signal is 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
Chapter 11.3.1 IDMT curves for overvoltage protection
in this manual.
The Timer calculates the start duration value START_DUR, which indicates the
percentage ratio of the start situation and the set operation time. The value is
available in the Monitored data view.
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
423
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