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
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 models 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 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. (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 models 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
Timer
runs when current is
above the
Minimum Trip
setting and does not run when current is below the
Minimum
Trip
setting. The timer continues to count until either the
SEF
element trips or the element
does not pickup for the duration of the user-specified SEF Reset Time parameter and the
SEF
element resets. The
Time Accumulation
mode is the default.
Reset Time—
When the
Definite Time
reset mode is selected, enter the time delay for
the reset (in seconds). (Range: 0.000-6000.000; 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: 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 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: 1.000-6000.000; 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: 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 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: 1.000-6,000.000; Step: 0.001)
High Current Lockout
Select this check box to specify the
High-Current Lockout Level
setting (in primary
amperes). No testing is performed at current above this level. (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.
66 S&C Instruction Sheet 766-530
Protection Setup
