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.
TRSOTF
This is the signal “Trip by Switch Onto Fault”. It is usually connected to the “switch onto
fault” output of line protection if multi-shot auto reclosing attempts are used. The input
will start the shots two to five.
Section 15 1MRK 506 369-UUS -
Control
668 Line distance protection REL670 2.2 ANSI
Application manual
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