Open-Source Voltage Threshold
This is the percentage of system voltage below which a Trip event will occur.
(Range: 5-100; Step: 1; Default: 20)
Open-Source Current Restraint Threshold
This is the current (in primary amperes) above which a Trip event is prevented.
(Range: 0-16000; Step: 1; Default: 10) The stated maximum is for 15-kV IntelliRupter fault
interrupters; 27-kV and 38-kV models are limited to 12,500 amps maximum. When set
to 0, the current restraint is disabled.
Open-Source Reset Voltage Threshold
This is the percentage of system voltage above which the
Open-Source Voltage
element
is reset. (Range: 5-100; Step: 1; Default: 80)
Open-Source Time to Trip
This is the time (in seconds) the
Open-Source Voltage
element must be below its
threshold for a Trip event to occur. (Range: 0.00-600.00; Step: 0.01; Default: 30.00)
Open-Source Reset Time
This is the time (in seconds) a reset-voltage level must be present for the
Open-Source Voltage
element to reset. (Range: 0.00-600.00; Step: 0.01; Default: 1.00)
Single-Phasing Protection and Sectionalizing
Specify the
Yes
,
No
(default),
VS-SEF
, or
IntelliTeam SG
option or this element. The
IntelliTeam SG
setting causes this element to only be active when the IntelliTeam SG
system is in the
Ready
mode.
This is an overvoltage element and it uses zero-sequence and negative-sequence
voltage to determine when it should trip. The two voltage elements are current-supervised
and use zero-sequence and negative-sequence current to determine when the overvoltage
elements should accumulate time. If zero- or negative-sequence currents are above the set
thresholds, the respective zero- or negative-sequence voltage elements do not accumulate
time. This gives priority to the
Overcurrent
elements during a high-current condition.
Zero Sequence Voltage Threshold
This is the percentage of system voltage above which a Trip event will occur.
(Range: 1-100; Step: 1; Default: 15) This setting always uses
Phase-to-Ground
mode
even when the
Voltage Reporting
setpoint on the
Setup>General>Site Related>System
screen is set to
Phase-to-Phase
mode. For example, when the
System Phase-to-Phase
Voltage
setpoint on the
Setup>General>Site Related>System
screen is set to 12.47 kV
(7.2 kV phase-to-ground), the
Zero Sequence Voltage Threshold
setpoint is set to
15%, and the Residual X-Side and Y-Side Voltage (3 V0) is 1,100 volts, the
Zero Sequence
Voltage Threshold
setting has been exceeded (1,100/7,200 = 15.3%).
Zero Sequence Current Restraint Threshold
This is the current (in primary amperes) above which a Trip event is prevented.
(Range: 10-16,000; Step: 1; Default: 50) The stated maximum is for 15-kV IntelliRupter
fault interrupters; 27-kV and 38-kV models are limited to 12,500 amps maximum.
Note:
The current restraint is effectively disabled when set to 16000. This would be
the recommended setting for DER applications where the intent is to open as fast as
possible on voltage loss.
S&C Instruction Sheet 766-530 79
Protection Setup
