ABB Relion 670 Series Applications Manual page 405

1MRK 511 358-UUS A
The single-pole 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-pole tripping for distance protection and
directional ground fault protection as required.
The inputs are combined with the phase selection logic and the pickup signals from the phase
selector must be connected to the inputs PS_A, PS_B and PS_C to achieve the tripping on the
respective single-pole trip outputs TR_A, TR_B and TR_C. 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-pole 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-pole Trip P3PTR must be activated. This is normally connected to the
respective output on the Synchronism check, energizing check, and synchronizing function
SESRSYN (25) 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 SESRSYN (25) 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 (25) to
switch SESRSYN (25) to three-phase reclosing. If this signal is not activated SESRSYN (25) will use
single-phase reclosing dead time.
The trip logic also has inputs TRIN_A, TRIN_B and TRIN_C 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
(25), Breaker failure, and so on. Other back-up functions are connected to the input TRIN as
described above. A typical connection for a single-pole tripping scheme is shown in figure 194.
Application manual
Note also that if a second line protection is utilizing the same SESRSYN (25) the
three-pole 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.
Section 15
Logic
399