12.2.2.3 Start auto reclosing from circuit breaker open information
M12391-100 v6
If a user wants to initiate auto reclosing from the circuit breaker open position instead of from
protection trip signals, the function offers such a possibility. This starting mode is selected
with the setting parameter
StartByCBOpen
=
On
. Typically a circuit breaker auxiliary contact of
type NO (normally open) is connected to
CBCLOSED
and
START
. When the signal changes from
circuit breaker closed to circuit breaker open an auto reclosing start pulse is generated and
latched in the function, subject to the usual checks. The auto reclosing sequence continues
then as usual. Signals from manual tripping and other functions, which shall prevent auto
reclosing, need to be connected to the
INHIBIT
input.
12.2.2.4 Blocking of the auto recloser
M12391-103 v4
Auto reclose attempts are expected to take place only for faults on the own line. The auto
recloser must be blocked by activating the
INHIBIT
input for the following conditions:
• Tripping from delayed distance protection zones
• Tripping from back-up protection functions
• Tripping from breaker failure function
• Intertrip received from remote end circuit breaker failure function
• Busbar protection tripping
Depending of the starting principle (general trip or only instantaneous trip) adopted above the
delayed and back-up zones might not be required. Breaker failure trip local and remote must
however always be connected.
12.2.2.5 Control of the auto reclosing dead time for shot 1
M12391-113 v5
Up to four different time settings can be used for the first shot, and one extension time. There
are separate settings for single-, two- and three-phase auto reclosing dead time,
t1 1Ph, t1 2Ph,
t1 3Ph
. If no particular input signal is applied, and an auto reclosing program with single-phase
auto reclosing is selected, the auto reclosing dead time
t1 1Ph
will be used. If one of the
TR2P
or
TR3P
inputs is activated in connection with the 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
STARTHS
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.
Section 12 1MRK 505 370-UEN D
Control
268 Busbar protection REB670
Application manual
To Next Page
Loading...
