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Ground Overcurrent

The Ground Overcurrent element trips the IntelliRupter fault interrupter when the

computed residual of the three-phase elements exceeds the pickup value for the time

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

Ground 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 models 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 multiplier for the inverse curve. (Range: 0.01-15.00;

Step: 0.01)

Time Adder—This is the time adder 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) The stated maximum is for 15-kV IntelliRupter fault interrupters; 27-kV and

38-kV models are limited to 12,500 amps maximum.

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 mode 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 models 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 models 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)

70 S&C Instruction Sheet 766-530

Protection Setup

S&C IntelliRupter PulseCloser User Manual

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