12.2.2.7 Maximum number of reclosing shots
M12391-120 v7
The maximum number of auto reclosing shots in an auto reclosing cycle is selected by the
setting
NoOfShots
. A maximum of five shots can be done. The type of auto reclosing used at
the first auto reclosing shot is set by the setting
ARMode
. The first alternative is three-phase
auto reclosing. The other alternatives include some single-phase or two-phase auto reclosing.
Usually there is no two-phase tripping arranged, and then there will be no two-phase auto
reclosing.
The decision for single- and three-phase trip is also made in the tripping logic (SMPTTRC)
function block where the setting
3 phase
,
1ph/3Ph
(or
1ph/2ph/3Ph
) is selected.
12.2.2.8
ARMode
=
3ph,
(normal setting for a three-phase shot)
M12391-124 v5
Three-phase auto reclosing, one to five shots according to the
NoOfShots
setting. The prepare
three-phase trip PREP3P output is always set (high). A trip operation is made as a three-phase
trip for all type of faults. The auto reclosing is as a three-phase auto reclosing as in mode
1/2/3ph described below. All signals, blockings, inhibits, timers, requirements and so on, are
the same as in the example described below.
12.2.2.9
ARMode
=
1/2/3ph
M12391-127 v8
Single-phase, two-phase or three-phase auto reclosing first shot, followed by 3-phase auto
reclosing shots, if selected. Here, the auto recloser is assumed to be "On" and "Ready". The
circuit breaker is closed and the operation gear ready (operating energy stored).
START
input
(or
STARTHS
) is received and sealed-in. The
READY
output is reset (set to false).
ACTIVE
output
is set.
• If
TR2P
and
TR3P
inputs are low (i.e. single-phase trip): The timer for single-phase auto
reclosing dead time is started and the
1PT1
output (single-phase reclosing in progress) is
activated. It can be used to suppress pole disagreement and earth-fault protection trip
during the single-phase dead time interval..
• If
TR2P
input is high and
TR3P
input is low (i.e. two-phase trip): The timer for two-phase
auto reclosing dead time is started and the
2PT1
output (two-phase reclosing in progress)
is activated.
• If
TR3P
input is high (i.e. three-phase trip): The timer for three-phase auto reclosing dead
time,
t1 3Ph
or
t1 3PhHS
, is started depending on if
START
or
STARTHS
input has been
activated and
3PT1
output (three-phase reclosing shot 1 in progress) is set..
While any of the auto reclosing dead time timers are running, the
INPROGR
output is activated.
When the dead time runs out, the respective internal signal is transmitted to the output
module for further checks and to issue a breaker closing command.
When a circuit breaker closing command is issued, the prepare three-phase output trip is set.
When issuing a circuit breaker closing command the
tReclaim
timer is started. If no tripping
takes place during that time, the auto recloser resets to the “Ready” state and the
ACTIVE
output resets. If the first reclosing shot fails, a three-phase trip will be initiated and three-
phase reclosing can follow, if selected.
12.2.2.10
ARMode
=
1/2ph
, 1-phase or 2-phase reclosing in the first shot
M12391-136 v5
At single-phase or two-phase tripping, the operation is as in the example described above,
program mode
1/2/3ph
. If the first reclosing shot fails, a three-phase trip will be issued and
three-phase auto reclosing can follow, if selected. In the event of a three-phase trip,
TR3P
input
high, the auto recloser will be inhibited and no auto reclosing takes place.
1MRK 505 370-UEN D Section 12
Control
Busbar protection REB670 269
Application manual
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