These two inputs are combined with the external phase selection logic. Phase selection 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 circuit breakers are
involved, one SMPPTRC block instance and one SMBRREC instance are used for each circuit
breaker. This will ensure correct operation and behavior of each circuit 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
.
BLOCK
BLKLKOUT
TRIN
TRINL1
TRINL2
TRINL3
PSL1
PSL2
PSL3
1PTRZ
1PTREF
P3PTR
SETLKOUT
RSTLKOUT
STDIR
TRIP
SMPPTRC
TRL1
TRL2
TRL3
TR1P
TR2P
TR3P
CLLKOUT
START
STL1
STL2
STL3
FW
REV
Phase segregated trip L1, L2 and L3
from example line differential or
distance protection
Phase selection L1, L2 and L3 from
external phase selection logic
Trip by communication scheme of
distance protection if required to
provide a single pole trip
Trip by communication scheme of
earth fault protection if required to
provide single pole trip
To activate lockout for any trip
To reset lockout
Protection functions with 3
phase trip, for example time
delayed overcurrent protection
OR
To prepare 3 phase trip
for any trip signal
SMBRREC
PREP3P
TR3P
STN
IEC05000545-5-en.vsdx
IEC05000545 V5 EN-US
Figure 5:
The trip logic function SMPPTRC used for single-phase tripping application
1MRK 511 445-UEN B
Section 4
Logic
Switchgear control unit SAM600-IO
29
Application manual
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