S&C IntelliRupter PulseCloser, Manual

Page: 119 / 181

Reset Max Restoration Timer Based on Multiple Contingencies—
Check Box
For Normally Open IntelliRupter Loop Restoration Logic
Under normal operation, if voltage is lost on one side of the normally open IntelliRupter
fault interrupter, the
Maximum Time Allowed for Restoration Timer starts and
the Time Delay Before First Test Timer starts timing to close the normally open
IntelliRupter fault interrupter. If voltage returns before the timer expires, in the normal
Loop logic, the Maximum Time Allowed for Restoration Timer continues to run
(time down). With this feature enabled for multiple contingencies, the Maximum Time
Allowed for Restoration Timer stops timing and is reset to its configured value. If
voltage is subsequently lost, the Maximum Time Allowed for Restoration Timer will
restart. This case is just the restoration of the voltage lost on one side (i.e. the circuit is
back to normal) of a normally open IntelliRupter fault interrupter.
When voltage is lost on one side of the normally open IntelliRupter fault interrupter,
both the Maximum Time Allowed for Restoration and the Time Delay Before
First Test Timers begin timing. When voltage is lost on the other side (both sides have
loss-of-voltage conditions), the Time Delay Before First Test Timer is reset, but the
Maximum Time Allowed for Restoration Timer continues to time down. Should
voltage return to one side of the normally open IntelliRupter fault interrupter before the
Maximum Time Allowed for Restoration Timer expires (i.e. reaches zero), the Time
Delay Before First Test Timer begins timing to close the normally open IntelliRupter
fault interrupter.
When this feature is enabled, if the Time Delay Before First Test Timer is actively
timing when the Maximum Time Allowed for Restoration Timer expires, the Loop
Restoration logic continues to run and lets the Time Delay Before First Test Timer
expire to allow the test close to complete and potentially restore voltage. When the test
close is initiated, the
Loop Restoration logic is disabled (the normal behavior when
the Maximum Time Allowed for Restoration Timer expires). If during the grace
period before the Time Delay Before First Test Timer expires, good source voltage
is lost again (i.e. voltage is lost on both sides of the normally open device), the Loop
Restoration logic is disabled (normal behavior when the Maximum Time Allowed
for Restoration Timer expires).
For Normally Closed IntelliRupter Loop Restoration Logic
The normally closed IntelliRupter
Loop Restoration
logic does not have any logic
opportunities to reset the Maximum Time Allowed for Restoration Timer because
the
Loop Restoration
logic is only active when the IntelliRupter fault interrupter trips
open and is in a not normal state and voltage returns to one side of the IntelliRupter fault
interrupter. Resetting the
Maximum Time Allowed for Restoration Timer
would
essentially leave Loop Restoration logic armed forever. Should the utility have line
crews working on the affected portions of the feeder and voltage is restored to either
side if the IntelliRupter fault interrupter, the
Loop Restoration logic would resume and
attempt a
Test/Close
operation when the
Time Delay for Test Timer
expires.
S&C Instruction Sheet 766-530 119
Loop Restoration