S&C IntelliRupter PulseCloser Manual page 122

Loop Restoration
122 S&C Instruction Sheet 766-530
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.