23
Modes of operation
The type SDR triple-single recloser has three
modes of operation:
Mode A,
3P Trip/3P LO
allows the three
single-pole reclosers to operate in the
three-pole mode as a standard three-
phase recloser. All open and close
commands are issued to all three poles
simultaneously. Any protection element
operation for any phase will trip all three
phases and all three phases will lockout
during a failed auto-reclose sequence.
Mode B,
1P Trip/3P LO
provides single-pole
tripping and auto-reclose. All open and
close commands are issued to all three
poles simultaneously. Any protection
element operation for any phase trips
only the affected phase when auto-
reclose is turned on. If any auto-reclose
sequence is not successful or if auto-
reclose is turned off, any protection
element trips all three phases and all
three phases will lockout.
Mode C,
1P Trip/1P LO
allows the three
poles of the reclosers to operate
independently for faults that only affect
one phase. All open and close commands
are issued to each pole independently.
Any protection element operation for any
phase trips only the affected phase. Auto-
reclose operates separately for each
phase. After an unsuccessful auto-reclose
sequence, each phase will lockout
independently.
Lockout operation
Lockout operation combines the mechanical
tripping/opening of the recloser pole or poles
and the interlocking to inhibit subsequent
closing of the recloser pole or poles.
The lockout can also be operated when under
load.
For a triple-single recloser, each of the three
poles will be mechanically operated
individually. The poles may be electrically
linked by the controller if the three-phase trip
and lockout is selected.
Open the recloser
1. Using a hot stick or suitable rod from the
ground, pull down the lockout handle of
the selected phase recloser pole until it
reaches the end (lower) position.
The recloser pole opens. By operating the
lockout mechanism, the recloser pole is
opened mechanically and locked in this
position.
The mechanical position indicator on the
bottom of the recloser switch unit pole
shows green.
The green OPEN LED for the selected
phase recloser pole on the protection and
control relay indicates the switch unit pole
has operated.
If three-phase trip and lockout is selected
from the controller, the poles may be
electrically linked. In this case, all three
poles will trip and lockout electrically.
The switch action is completed.
As long as the lockout handle is pulled out, it
is not possible to close the selected phase
recloser pole or poles electrically, whether
locally or from a remote location.
Note: All three recloser poles must be
mechanically locked out to prevent electrical
operation of individual poles in the case that
the single-phase mode of operation is
selected from the controller.
Closing the recloser electrically from the
controller
1. Using a hot stick or suitable rod from the
ground, push the lockout handle of the
locked out recloser pole back in
completely.
2. Follow the control and protection relay
instructions to electrically close the
recloser pole or poles.
The selected phase recloser pole or poles
closes.
After switching, confirm that the red
CLOSED LED on the control relay indicates
the switch position has been reached for
the selected phase recloser pole or poles.
Confirm the green OPEN LED is off for the
selected phase recloser pole or poles.
The switch action is complete.
The mechanical position indicator on the
bottom of the recloser switch unit shows
red for the selected phase recloser pole or
poles.
Note: The lockout handle needs to be pushed
back completely. Otherwise, the interlocking
still prevents closing.
Figure 27: Lockout handle with ring
for manual operation (pushed in,
normal operation)
Figure 28: Lockout handle with ring
for manual operation (pulled out,
recloser open and locked out)
Figure 29:Bottom view of fully
assemble triple-single recloser with
phase B locked out
Summary of Contents for SDR 15.5
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