ABB RET670 - Page 744

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.
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.
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
301.
Section 3 1MRK504116-UUS C
IED application
738
Application manual