Single- And/Or Three-Phase Tripping - ABB REG670 Applications Manual

1MRK 502 071-UEN -
16.1.2.2
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

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. Inputs TRINL1, TRINL2 and TRINL3 shall be used for
trip signals from functions with built-in phase selection logic such as distance or line
differential protection functions.
The inputs 1PTRZ and 1PTREF are used for single-phase tripping from functions
which do not have built-in phase selection logic:
• 1PTRZ is connected to communication receive from distance protection scheme
(it means that another distance protection function has seen or detected the fault)
• 1PTREF trip by earth fault protection via communication scheme to provide
single-pole tripping
These two inputs are combined with the external phase selection logic. Phase selective
signals from the external 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 is always 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 input is normally connected to the output PREP3P on the autorecloser function
SMBRREC but can also be connected to other signals, for example, an external logic
signal. If two breakers are involved, one SMPPTRC block instance and one
SMBRREC instance are used for each breaker. This will ensure correct operation and
behavior of each breaker.
The output TR3P must be connected to the input TR3P on the SMBRREC function in
order to switch SMBRREC to perform a three-phase reclosing. If this signal is not
activated, SMBRREC will use single-phase dead time.
If a second line protection is utilizing the same SMBRREC, the three-
phase trip signal must be generated as OR conditions from both line
protections.
Other back-up functions are connected to the input TRIN as described above for three-
phase tripping. A typical connection for a single-phase tripping scheme is shown in
figure 302.
Section 16
Logic
601