ABB RELION 620 Series Technical Manual page 658

Section 4
Protection functions
652
drop-off situation exceeds the set Reset delay time, the Timer is reset and the START
output is deactivated.
When the IDMT operation time curve is selected, the functionality of the Timer in the
drop-off state depends on the combination of the Type of reset curve, Type of time reset
and Reset delay time settings.
Table 603: Reset time functionality when the IDMT operate time curve selected
Reset functionality
Instantaneous Operation timer is
reset "Reset
Instantaneously"
when drop-off
occurs
Frozen timer Operation timer is
frozen during
drop-off
Linear decrease Operation timer
value linearly
decreases during
the drop-off
situation
Setting Type of Setting Type of time
reset curve reset
"Immediate" Setting has no
effect
"Def time reset" "Freeze Op
Timer"
"Def time reset" "Decrease Op
timer"
1MRS757644 F
Setting Reset delay
time
Setting has no
effect
Operate timer I
reset after the set
Reset delay time
has elapsed
Operate timer I
reset after the set
Reset delay time
has elapsed
620 series
Technical Manual