ABB RELION 620 Series Technical Manual page 276

Section 4
Protection functions
270
Table 215: The reset time functionality when the IDMT trip time curve is selected
Type of reset curve
"Immediate"
"Def time reset"
"DT Lin decr rst"
GUID-846395DB-B778-4782-A6FA-9D7B62D92F65-ANSI V2 EN
Figure 124: Behavior of different IDMT reset modes. The value for Type of reset
curve is "Def time reset". Also other reset modes are presented for the
time integrator.
Description of operation
The trip timer is reset instantaneously when drop-off
occurs.
The trip timer is frozen during drop-off. The trip timer
is reset after the set Reset delay time is exceeded.
The trip timer value linearly decreases during the
drop-off situation. The trip timer is reset after the set
Reset delay time is exceeded.
1MAC504801-IB E
620 series ANSI
Technical Manual