ABB Relion REQ650, Applications Manual

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transferred on the line during the dead time that arises before reclosing. Single phase
tripping during single phase faults must be combined with single pole reclosing.
11.2.2.1 Single- and/or three-phase tripping
The single-/three-phase tripping will give single-phase tripping for single-phase
faults and three-phase tripping for multi-phase fault. The operating mode is always
used together with a single-phase autoreclosing scheme.
The single-phase tripping can include different options and the use of the different
inputs in the function block.
The inputs 1PTRZ and 1PTREF are used for single-phase tripping for distance
protection and directional earth fault protection as required.
The inputs are combined with the phase selection logic and the start signals from the
phase selector must be connected to the inputs PSL1, PSL2 and PSL3 to achieve the
tripping on the respective single-phase trip outputs TRL1, TRL2 and TRL3. The
Output TRIP is a general trip and activated independent of which phase is involved.
Depending on which phases are involved the outputs TR1P, TR2P and TR3P will be
activated as well.
When single-phase tripping schemes are used a single-phase autoreclosing attempt is
expected to follow. For cases where the autoreclosing is not in service or will not
follow for some reason, the input Prepare Three-phase Trip P3PTR must be activated.
This is normally connected to the respective output on the Auto- Recloser but can also
be connected to other signals, for example an external logic signal.If two breakers are
involved, one TR block instance and one Auto-Recloser instance is used for each
breaker. This will ensure correct operation and behavior of each breaker.
The output Trip 3 Phase TR3P must be connected to the respective input in SESRSYN
to switch SESRSYN to three-phase reclosing. If this signal is not activated SESRSYN
will use single-phase reclosing dead time.
Note also that if a second line protection is utilizing the same
SESRSYN the three-phase trip signal must be generated, for example
by using the three-trip relays contacts in series and connecting them in
parallel to the TR3P output from the trip block.
The trip logic also has inputs TRINL1, TRINL2 and TRINL3 where phase-selected
trip signals can be connected. Examples can be individual phase inter-trips from
remote end or internal/external phase selected trip signals, which are routed through
the IED to achieve, for example SESRSYN, Breaker failure, and so on. Other back-
up functions are connected to the input TRIN as described above. A typical connection
for a single-phase tripping scheme is shown in figure
100 .
Section 11
1MRK 505 291-UEN A
Logic
248
Application manual