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1MRK 505 370-UEN D
reclosing dead time when communication is not working, that is, one line end might trip with a
zone2 delay. If this is used the auto recloser must also be started from zone2 time delayed trip.
RESET
Used to reset the auto recloser to start conditions. Possible hold by thermal overload
protection will be reset. Circuit breaker position will be checked and time settings will be
restarted with their set times.
RSTCOUNT
There is a counter for each type of auto reclosing and one for the total number of circuit
breaker close commands issued. All counters are reset with the
IEC 61850 command.
SKIPHS
The high-speed auto reclosing sequence can be skipped and be replaced by normal auto
reclosing sequence by activating
activated. The replacement is done for the 1st shot.
START
START input should be connected to the trip function (SMPPTRC) output, which starts the
The
auto recloser for 1/2/3-phase operation. It can also be connected to a binary input for start
from an external contact. A logical OR-gate can be used to combine the number of start
sources.
STARTHS, Start high-speed auto reclosing
It may be used when one wants to use two different dead times in different protection trip
operations. This input starts the dead time
this input is without a synchronization check.
SYNC
This input is connected to the internal synchrocheck function when required or to an external
device for synchronism. If neither internal nor external synchronism or energizing check is
required, it can be connected to a permanently high source, TRUE. The signal is required for
three-phase shots 1-5 to proceed (Note! Not the high-speed step).
THOLHOLD
Signal "Thermal overload protection holding back auto reclosing". It can be connected to a
thermal overload protection trip signal which resets only when the thermal content has fallen
to an acceptable level, for example, 70%. As long as the signal is high, indicating that the line is
hot, the auto reclosing is held back. When the signal resets, a reclosing cycle will continue.
Observe that this have a considerable delay. Input can also be used for other purposes if for
some reason the auto reclosing shot needs to be halted.
TR2P and TR3P
Signals for two-phase and three-phase trip. They are usually connected to the corresponding
output of the trip function block. They control the choice of dead time and the auto reclosing
cycle according to the selected program. Signal TR2P needs to be connected only if the trip
function block has been selected to give 1ph/2ph/3ph trip and an auto reclosing cycle with
two phase reclosing is foreseen.
Busbar protection REB670
Application manual
SKIPHS input before the STARTHS high-speed start input is
StartByCBOpen is used, the circuit breaker open condition shall also be
If
START input.
connected to the
RSTCOUNT input or by an
t1 3PhHS . High-speed reclosing shot 1 started by
Section 12
Control
275
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