Figure 36. The
Setup>Protection>General Profile 1>Direction 1 Current>Initial Trip>Additional
Features
screen.
Initial Trip – Additional Features Section
Intelligent Fuse Saving
The
Intelligent Fuse Saving
(IFS) element is only active in the
Initial Trip
state. When
the
IFS
element (
Phase
and/or
Ground
) picks up and starts timing for a minimum of
2 cycles, and current goes below both the
Phase Minimum Trip
and
Ground Minimum
Trip
settings for at least two cycles, the
IFS
elements are turned off for the duration of
the
O/C Reset
and
IFS Sequence Reset
Timers
. See Figure 36.
If another fault occurs within the sequence reset time window, only the base curve
is active and it would time and potentially trip the IntelliRupter fault interrupter, which
then enters the test sequence as usual. The IntelliRupter fault interrupter will stay in its
Initial Trip
state unless it trips on the base curve.
After the sequence reset time expires and no elements have been picked up, the
IFS
mode is re-initiated and the IntelliRupter fault interrupter is reset to the
Initial Trip
state.
Inverse Segment
Select the fuse type and speed to be saved. Select from the drop-down list of inverse curve
names or select the
None
option. This curve applies to the enabled
Phase
or
Ground
IFS
element. If the
None
option is selected, only the
Definite Time
settings will be used.
Phase check box—
Select this check box to specify the phase overcurrent inverse curve.
Ground check box—
Select this check box to specify the ground overcurrent inverse
curve.
52 S&C Instruction Sheet 766-530
Protection Setup