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—
When 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 models 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 models 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)
Sensitive Earth
The
Sensitive Earth
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 the
Definite Time
settings.
Sensitive Earth Check box—
Select to configure 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
Definite Time
settings
will be used.
Min. Trip—
This is the current (in primary amperes) at which the Inverse Curve begins
timing. (Range: 3.0-16,000.0; Step: 0.1. When the
Voltage Supervised Sensitive Earth
element is selected, Range: 1.0-16,000.0, Step: 0.1) 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: 1.000-6000.000; 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 Current Cutoff—
This is the current (in primary amperes) at which the TCC curve
begins timing. (Range: 3.0-16,000.0; Step: 0.1. When the
Voltage Supervised Sensitive
Earth
element is selected. (Range: 1.0-16,000.0; Step: 0.1) The stated maximum is for 15-kV
IntelliRupter fault interrupters; 27-kV and 38-kV are limited to 12,500 amps maximum.
Reset—
The reset method for the inverse curve is configurable for
D/T
(Definite Time) or
T/A
(Time Accumulation) mode. The
Time Accumulation
mode times when current is
above the
Minimum Trip
value and does not time when current is below the
Minimum
Trip
value. The timer continues to run until either the
SEF
element trips or the element
does not pick up for the duration of the user-specified SEF Element Reset Time parameter
and the element resets. The
Time Accumulation
setting is the default.
S&C Instruction Sheet 766-530 49
Protection Setup