ABB REB670 Applications Manual page 335

1MRK 505 370-UUS A
Busbar protection REB670 2.2 ANSI
Application manual
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.
RI
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 RI input.
RI_HS, Initiate 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 synchronism check 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
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 1/2/3 pole trip and an auto reclosing cycle with two phase reclosing is
foreseen.
Section 12
Control
329