ABB RELION REX640 Technical Manual page 580

Section 4
Protection functions
574
are sent to the remote end via communication. The direct-intertripping of the line
differential protection is included into LNPLDF. The OPERATE output combines the
operate signals from both stages, local and remote, so that it can be used for the direct
inter-trip signal locally.
OPR_HS_A
Inst.
OPR_HS_B
high stage
OPR_HS_C
OPR_LS_A
OPR_LS_B
OPR_LS_C
Stabilized
low stage
STR_LS_A
STR_LS_B
STR_LS_C
OPR_HS_A
OPR_HS_B
RECEIVE
OPR_HS_C
OPR_LS_A
OPR_LS_B
RECEIVE
OPR_LS_C
STR_LS_A
STR_LS_B
RECEIVE
STR_LS_C
GUID-C7B85252-9899-466D-BF07-50DD7A9CF10B V1 EN
Figure 315: Operation logic of the direct intertrip function
The start and operate signals are provided separately for the low and high stages, and
in the local and remote.
Blocking functionality
There are two independent inputs that can be used for blocking the function: BLOCK
and BLOCK_LS. The difference between these inputs is that BLOCK_LS (when
TRUE) blocks only the stabilized low stage leaving the instantaneous high stage
operative. BLOCK (when TRUE) blocks both stages and also the PRO_ACTIVE
OR
OR
OR
SEND
OR
SEND
OR
SEND
OR
OR
OR
1MRS759142 C
OPERATE
START
OPR_HS_LOC
OPR_LS_LOC
STR_LS_LOC
OPR_HS_REM
OPR_LS_REM
STR_LS_REM
REX640
Technical Manual