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S&C Instruction Sheet 1041-540 27
Overcurrent Fault Protection
Phase A OC; Fault current sensed & cleared; Noted
The switch control detected an overcurrent fault on Phase A. That overcurrent fault
has ended. The switch control is waiting to determine whether voltage will be lost on
all three phases. If all voltage is lost, the switch control will begin timing for a possible
recloser operation.
Note:
The switch control displays similar messages for Phase B, Phase C, and Ground
overcurrent conditions.
Phase B OC; Fault current sensed & cleared; Noted
See the “Phase A OC; Fault current sensed & cleared; Noted” section above.
Phase C OC; Fault current sensed & cleared; Noted
See the “Phase A OC; Fault current sensed & cleared; Noted” section above.
Ground OC; Fault current sensed & cleared; Noted
See the “Phase A OC; Fault current sensed & cleared; Noted” section above.
OC then voltage o.k.; Load-side protective open; Noted
The switch control detected an overcurrent fault. This condition was not followed within
0.6 seconds by a loss of voltage on the same phase. The control assumed a load-side fault
occurred, but the condition was cleared on the load side by a fuse, recloser, etc.
Note:
No timer or other action is started for this type of event.
OC then VL; Source-side protective open; Counting
The switch control detected an overcurrent fault, which was followed within 0.6 seconds
by a loss of voltage on all phases. The switch control assumed a load-side fault occurred
and the condition was cleared on the source side by a three-phase device, such as a
breaker, interrupter, or recloser. The control added one count to the recloser operations
counter.
Reclose memory time limit; Sequence ended; Count reset
The
Sectionalizer Reset
timer expired. The switch control will consider future events
to be part of a different event sequence.
Note:
The switch control always displays this message when the timer expires.
VL; Source-side fault; Sectionalizing disarmed
The switch control detected a three-phase voltage loss but no overcurrent fault condition.
The control assumed a source-side fault occurred and the condition was cleared on the
source side by a three-phase device, such as a breaker, interrupter, or recloser. The control
started the
Sectionalizer Reset
timer and set the value in the recloser operations counter
to “1.” Because the fault was on the source side, the control will not trip open the switch
because of recloser counts with fault current detected, but it will open the switch if the
Recloser Counts to Trip, Voltage Loss Only
count is reached.
VL; Load-side fault; Sectionalizing armed
The switch control previously detected a phase or ground overcurrent fault followed
within 0.6 seconds by three-phase voltage loss. The control then assumed the present
voltage loss was associated with the previous load-side fault and the condition was
again cleared on the source side by a three-phase device, such as breaker, interrupter,
or recloser. The control incremented the recloser operations counter.
Full count reached; Source-side fault; Noted
The full count was reached on the recloser operations counter. Because the first voltage
loss in the sequence was not preceded by an overcurrent fault, the control took no
sectionalizing action on the
Recloser Counts to Trip, Fault Current Detected
count.