ABB RED650 Applications Manual page 249

1MRK 505 393-UEN B
Line differential protection RED650 2.2 IEC
Application manual
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 RSTCOUNT
input or by an IEC 61850 command.
SKIPHS
The high-speed auto reclosing sequence can be skipped and be replaced by normal
auto reclosing sequence by activating SKIPHS input before the STARTHS high-
speed start input is activated. The replacement is done for the 1st shot.
START
The START input should be connected to the trip function (SMPPTRC) output,
which starts 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.
If StartByCBOpen is used, the circuit breaker open condition shall
also be connected to the START input.
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 t1 3PhHS. High-speed
reclosing shot 1 started by 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
Section 12
Control
243