Trip on Count
This is the number of current spikes counted that determine when the
SEF
element trips.
(Range: 1-100; Step: 1; Default: 20) This setting applies to both directions.
Trip Within Time
The time period in which the
Trip on Current Spikes
mode must occur for the
SEF
element to trip. The Trip Within Time period is a constant rolling window, so when no
current spikes occur within the configured time period the
Trip on Current Spikes
counter is fully reset. (Range: 1-600; Step: 1; Default: 40) This setting applies to both
directions.
Application Notes for the SEF Trip on Current Spikes mode
Reclose
and
PulseClosing Technology
operations from other devices on the system
will likely register as a current spike.
• A recloser or breaker three-phase operation (upline or downline) may only put a total
of four current spikes on the system for a full-test.
• A recloser or IntelliRupter fault interrupter single-phase operation (upline or down-
line) may create a current unbalance that will count as a current spike. If the current
unbalance remains above the
SEF Minimum Trip
setting until all three phases are
closed, the event will appear as a single current spike to the counter.
• An IntelliRupter fault interrupter could see the initial trip plus eight pulses for a
permanent fault at a downline IntelliRupter fault interrupter, and the
SEF Current
Spike
counter could see many current spikes depending on the test sequence used.
Most
PulseClosing Technology
events will generate 2-4 spikes per test sequence,
depending on the type of fault and the load that occurs when the first phase is closed.
• When a full overcurrent sequence is used, the recommended minimum value of cur-
rent spike counts to trip is on the order of 15-20 counts. However, in scenarios where
only an initial trip is used (with no test sequence), the number of current spikes gener-
ated could be a low single-digit number. There is no
Sensitive Earth
element in the
Closing Profile configurations.
Voltage Supervised Sensitive Earth Section
Voltage Supervised Sensitive Earth check box
Checking the box opens the screen settings in this section. This function increases
sensitivity and provides quicker response during a fire season. The
Inverse Section of
the Sensitive Earth
element is directed through the logic shown on the screen. See
Figure 42 on page 61 for a detailed logic diagram explaining how this function works.
Note:
When the Voltage Supervised Sensitive Earth check box is checked, the
Single-Phase Protection and Sectionalizing
and
Trip on Single Phase
setpoints on the
Setup>Protection>General Profile 1>Voltage, Frequency, and
Sectionalizing>Voltage Trip
screen must be set for “VS-SEF.”
60 S&C Instruction Sheet 766-530
Protection Setup