Open-Source Sectionalizing (Positive Sequence)
Specify a Yes, No (default), IntelliTeam SG, or Loops Only option. The IntelliTeam
SG setting will cause this element to be active only when the IntelliTeam SG system is
in the Ready mode.
This is an Undervoltage element and uses positive-sequence voltage to determine
whether it should trip. The element is current-supervised and uses positive-sequence cur-
rent to determine when the undervoltage element is allowed to accumulate time. When
positive-sequence current is above the set threshold, the Open-Source Sectionalizing
element does not accumulate time. This gives priority to the overcurrent elements during
a high-current condition.
• Input values for the voltage threshold are in percentages.
• The base value is the line-to-ground RMS system voltage.
• The actual value measured is the resulting positive sequence voltage.
For example, if the line-to-ground nominal RMS voltage is 10 kV and the Open Source
Voltage Threshold setting is 75%, the IntelliRupter fault interrupter will trip when the
positive-sequence voltage measured is less than 0.75*10 kV = 7.5 kV and if the positive-
sequence current is less than the configured Current Restraint Threshold setting.
The Current Threshold setpoint is in primary amps.
For example, if the Current Restraint Threshold setting is set for 20 A and the
positive-sequence current measured is greater than 20 A, the Open-Source element
will not accumulate time.
Each General Profile feature has settings for multiple Voltage Trip elements.
See Figure 49.
Voltage Trip
Figure 49. The Setup>Protection>General Profile 1>Voltage, Frequency, and Sectionalizing>
Voltage Trip screen.
78 S&C Instruction Sheet 766-530
Protection Setup
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