start, the auto reclosing dead time for two-phase or three-phase auto reclosing is used.
There is also a separate time setting facility for three-phase high-speed auto reclosing
without synchrocheck,
t1 3PhHS
, available for use when required. It is activated by the
RI_HS
input.
A time extension delay,
tExtended t1
, can be added to the dead time delay for the first
shot. It is intended to come into use if the communication channel for permissive line
protection is lost. In a case like this there can be a significant time difference in fault
clearance at the two line ends, where a longer auto reclosing dead time can be useful.
This time extension is controlled by the setting
Extended t1
=
On
and the
PLCLOST
input. If this functionality is used the auto recloser start must also be allowed from
distance protection zone 2 time delayed trip. Time extension delay is not possible to
add to the three-phase high-speed auto reclosing dead time,
t1 3PhHS
.
12.2.2.6
Long trip signal
M12391-117 v4
In normal circumstances the auto recloser is started with a protection trip command
which resets quickly due to fault clearing. The user can set a maximum start pulse
duration
tLongStartInh
. This start pulse duration time is controlled by setting
LongStartInhib
.
When start pulse duration signal is longer than set maximum start pulse duration, the
auto reclosing sequence interrupts in the same way as for a signal to the
INHIBIT
input.
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-pole 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-pole trip PREP3P output is always set (high). A trip operation is made as
a three-pole 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.
Section 12
1MRK 505 370-UUS A
Control
320
Busbar protection REB670 2.2 ANSI
Application manual
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