S&C TripSaver II - Page 65

S&C Instruction Sheet 461-504 65
Informational and Settings Screens
Advanced TCC Curve Setup (optional). (Click on the words to expand/collapse area).
See Figure 91.
Figure 91. The Advanced TCC Curve Setup fields when DefiniteTime is selected under
Inverse Segment.
Time Adder (check box). Select this check box to enable time adder.
Time Adder, Time s. Specify a time modier (in seconds) to add a constant time delay
to the inverse curve segment. (Default: 0; minimum value: 0; maximum value: 0.25).
Max Time (check box). Select this check box to enable the Max Time setting. The Max
Time setting enables the setting of a maximum time duration of the current before a trip
will occur. This is helpful when TCC curves are designed where the load or fault must be
sustained for long durations (seconds or minutes) when the current magnitude is near
the minimum trip threshold, before a Protection Trip operation occurs according to
the set TCC curve. When the Max Time setting is applied and a fault event occurs, either
the Max Time setting or the Time-Current Characteristic curve will cause the recloser
to trip, whichever is fastest.
Max Time, Time s. Specify a maximum time (in seconds) to trip prior to inverse
curve segment expiration. (Default: Disabled; minimum value: 0.2; maximum value: 180).
Low Current Cutoff (check box). Select this check box to enable low-current cutoff.
Low Current Cutoff, Current, A. Specify the current (in primary amperes) below which
the inverse curve segment is truncated. The Low Cutoff Current setting will then be
the actual minimum trip current (minimum value: 5; maximum value: 600). Note: This
value must be greater than the minimum trip current of the inverse curve segment and
smaller than the High Current Cutoff setting.
Denite Time 2 (check box). Select this check box to enable the Denite Time 2
element. Note: The Denite Time 2 element must be enabled before the Denite Time
3 element can be enabled. If the Denite Time 2 element is deselected, the Denite
Time 3 element is deselected automatically.
Denite Time 2 Current, A. Specify the current (in primary amperes) at which the
Denite Time 2 element picks up (minimum value: 5; maximum value: 6,300). See
Figure 91. Note: This value must be greater than the DeniteTime Current setting,
less than or equal to the interrupting rating of the recloser, and smaller than the High
Current Cutoff setting.