Figure 48. The
Setup>Protection>General Profile 1>Direction 1 Current>Testing After Initial
Trip>Sensitive Fault Protection Elements
screen.
Three-Phase Trip for Multiple Phase Faults
When set to the
Yes
option and the second faulted pole reaches at least 20% of the
milestone (or trip sequence) before the first faulted pole reaches the
Overcurrent Trip
state, the IntelliRupter fault interrupter will trip all three phases for the present
Test
operation and all subsequent
Test
operations. When set to the
No
option, each phase
will trip independently.
Retain Source Side for Test Sequence
Select the
No
option to allow the IntelliRupter fault interrupter to respond to faults
in both directions at any time. Select the
Yes
option to restrict circuit testing for the
rest of the test sequence to the fault direction identified by the
Initial Trip
operation.
Simultaneous bi-directional overcurrent protection is maintained for the
Initial Trip
operation for either option. The
No
option is the default and recommended option for
general applications.
This feature prevents backfeeding a substation caused by a restoration event return-
ing voltage from the opposite side. When set to the
Yes
option, the source side is deter-
mined at the time of the
Initial Trip
operation and is the side that is not faulted. If the
Directionality
element determines the fault is on the Direction 1 terminals, then the
Direction 2 terminals are the source side for the duration of the test sequence. If direc-
tionality cannot be determined, the test sequence is ended and goes to the
Lockout
state.
If source-side voltage is not present for the duration of the
Test Sequence or Pulse
Finding Loss-of-Source Timeout
Timer
, the IntelliRupter fault interrupter goes to
the
Lockout
state.
Single-Phase Current Restraint, Phase
Specify a phase current above which a
Single-Phase Trip
operation will not be allowed,
and all
Trip
operations will be performed three-phase. (Range: 10-800; Step: 1 amp;
Default: None)
Single-Phase Current Restraint, Ground
Specify a ground current above which a
Single-Phase Trip
operation will not be
allowed and all
Trip
operations will be performed three-phase. (Range: 10-800;
Step: 1 amp; Default: None)
Sensitive Earth Fault Protection Elements
The SEF element will always trip three-phase and will always close after each time delay
preceding an SEF trip. See Figure 48.
76 S&C Instruction Sheet 766-530
Protection Setup