ABB RELION REX640 Technical Manual page 776

Section 4
Protection functions
770
GUID-130E2B9B-6D0B-47A6-9556-9C38BF9242D4 V1 EN
Figure 423: 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 the IDMT curves for overvoltage protection
manual.
1MRS759142 C
section in this
REX640
Technical Manual