ABB RELION 620 Series Technical Manual page 659

1MRS757644 F
620 series
Technical Manual
GUID-17E4650D-ADFD-408E-B699-00CBA1E934B8 V1 EN
Figure 332: Behavior of different IDMT reset modes
Figure 332 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.
Section 4
Protection functions
653