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Figure 214: 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 11.2.1 IDMT curves for overcurrent protection
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.
Blocking logic
There are three operation modes in the blocking function. The operation modes are
controlled by the
BLOCK
input and the global setting in Configuration > System >
Blocking mode which selects the blocking mode. The
BLOCK
input can be controlled
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
431