Note:
Voltage must be below the
Backfeed Voltage Level
setpoint for
Loop
Restoration
mode to qualify a voltage loss. This setpoint is on the
General>
Site-Related>System
screen. The default value is 10%. See Figure 6 on page 19. If
voltage goes above the
Backfeed Voltage Level
setpoint while timing on the
Time
Delay Before First Test
setpoint, this timer is reset.
The
Loop Restoration
test sequence is initiated when the
Time Delay Before First
Test
Timer
expires. If voltage returns before the
Time Delay Before First Test
Timer
expires, the timer stops and resets. If voltage is subsequently lost, the timer starts again.
When voltage is lost on both the X and Y sides before closing is initiated, the
Time
Delay Before First Test
Timer
stops and resets. If voltage returns on only one side
the timer starts.
The
Maximum Time Allowed for Restoration
Timer
stops when one of the
following occurs:
• A close attempt is successful and the IntelliRupter fault interrupter has transitioned
to a general profile
•
Loop Restoration
mode is disabled for any reason, including when the
Hot Line
Tag
mode is applied or a manual command is received to close
• The
Maximum Time Allowed for Restoration
Timer
expires
•
Loop Restoration
mode is in the
Ready
state (The IntelliRupter fault
interrupter remains open, all
Loop Restoration
Timers
are reset, and
Loop
Restoration
logic remains in the
Enabled
mode.)
•
Loop Restoration
mode is not in the
Ready
state (The IntelliRupter fault
interrupter remains open and goes to the
Lockout
state, all
Loop Restoration
Timers
are reset, and
Loop Restoration
mode is in the
Disabled
state.)
The
Automatic Enable of Loop Restoration for Manual Lever Open
mode (only
applicable to the Normally Open configuration) only applies when an OPEN-CLOSE-
READY lever operation causes the state to change. A state change caused by a fault event
will not result in automatically enabling the
Loop Restoration
mode.
Normally Open Loop Restoration Test Sequence
The Loop Restoration Test sequence is configured on the
Setup>Restoration>Loop
screen and is used by both Normally Open and Normally Closed configurations.
The Normally Open Loop Restoration Test sequence follows this procedure:
• When the
Time Delay Before First Test
Timer
expires, Closing Attempt #1 starts
its Closing Profile.
• When the
PulseClose Technology
operation detects a fault or the
Close
operation
trips because of a fault, the test sequence continues to the next open interval and
Close
operation as specified. This sequence continues for the configured number of
close attempts.
• The IntelliRupter fault interrupter goes to the
Lockout
state when a
Voltage
element,
Sectionalizing
element, or
Frequency
element trips during the
Loop Restoration
Test
operation.
• When a close attempt is successful, the Closing Profile is replaced by the
active general profile. The
Loop Restoration
mode is disabled, and protection
functions are normal.
122 S&C Instruction Sheet 766-530
Loop Restoration