S&C IntelliRupter PulseCloser Manual page 64

Protection Setup
64 S&C Instruction Sheet 766-530
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 Definite Time settings.
Ground Check box—Select to configure this element.
Inverse Segment—Select from the drop-down list of inverse curve names or select
the None setting. When the None setting is selected, only the Definite 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) defining 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 modifier for the inverse curve. (Range: 0.01-15.00; Step: 0.01)
Time Adder—This is the time modifier 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 Definite Time 1 element, and the Definite Time 2 element. (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.
Reset—Select the reset method for the inverse curve from the drop-down list:
D/T (Definite Time) or E/M (Electromechanical) mode.
Reset Time—If the Definite Time reset mode is selected, enter the time delay for the
reset (in seconds). (Range: 0.000-600.000; Step: 0.001)
Definite Time 1 Min. Trip—This is the current (in primary amperes) at which the
Definite 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.
Definite Time 1 Min. Time—This is the time delay (in seconds) after which the Definite
Time 1 element trips. (Range: 0.000-600.000; Step: 0.001)
Definite Time 2 Min. Trip—This is the current (in primary amperes) at which the
Definite 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.
Definite Time 2 Min. Time—This is the time delay (in seconds) after which the Definite
Time 2 element trips. (Range: 0.000-600.000; Step: 0.001)