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Negative Sequence

The Negative Sequence element trips the IntelliRupter fault interrupter when the

negative sequence component of the three-phase elements exceeds the pickup value for

the time value set by the Inverse Curve or Denite Time settings.

Negative Sequence Check box—Select to congure this element.

Inverse Segment—Select from the drop-down list of inverse curve names or select the

None option. When the None option is selected, only the Denite Time settings will

be used.

Min. Trip—This is the current (in primary amperes) at which the inverse curve begins

timing. (Range: 6-16,000; Step: 1) The stated maximum is for 15-kV IntelliRupter fault

interrupters; 27-kV and 38-kV are limited to 12,500 amps maximum.

Min. Time—This is the time (in seconds) dening the fastest response of the inverse

curve portion of the TCC curve. (Range: 0.000-100.000; Step: 0.001)

Time Mult—This is the time modier for the inverse curve. (Range: .001-15.00; Step: 0.01)

Time Adder—This is the time modier for the inverse curve. (Range: -10.000-100.000;

Step: 0.001)

Low Cutoff—This is the current (in primary amperes) at which the TCC curve

begins timing. This value must be equal to or greater than the lowest pickup value of

the inverse curve, the Denite Time 1 element, and the Denite Time 2 element.

(Range: 6-16,000; Step: 1) Also see the Maximum Interrupting Current setting on the

Setup>General>Site-Related screen.

Reset—Select the reset method for the inverse curve from the drop-down list:

D/T (Denite Time) or E/M (Electromechanical) mode.

Reset Time—If the Denite Time reset method is selected, enter the time delay for the

reset (in seconds). (Range: 0.000-600.000; Step: 0.001)

Denite Time 1 Min. Trip—This is the current (in primary amperes) at which the

Denite Time 1 element picks up. (Range: 6-16,000; Step: 1) The stated maximum is

for 15-kV IntelliRupter fault interrupters; 27-kV and 38-kV are limited to 12,500 amps

maximum.

Denite Time 1 Min. Time—This is the time delay (in seconds) after which the Denite

Time 1 element trips. (Range: 0.000-600.000; Step: 0.001)

Denite Time 2 Min. Trip—This is the current (in primary amperes) at which the

Denite Time 2 element picks up. (Range: 6-16,000; Step: 1) The stated maximum is

for 15-kV IntelliRupter fault interrupters, 27-kV and 38-kV are limited to 12,500 amps

maximum.

Denite Time 2 Min. Time—This is the time delay (in seconds) after which the Denite

Time 2 element trips. (Range: 0.000-600.000; Step: 0.001)

S&C Instruction Sheet 766-530 65

Protection Setup

S&C IntelliRupter PulseCloser User Manual

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