ABB RED615 Technical Manual page 371

1YHT530004D05 D
615 series
Technical Manual
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-002B4F83-260D-4ADA-983E-9CB46DBF1228 V3 EN
Figure 191: 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
PROT_ACTIVE output is updated according to the BLOCK input status, as
described in the Fail safe function chapter.
The BLOCK and BLOCK_LS input statuses affect only the behavior of the local
protection instance. When a line differential protection stage (stabilized low or
instantaneous high) is blocked, also the received remote signals related to the
Protection functions
OR
OR
OR
SEND
OR
SEND
OR
SEND
OR
OR
OR
Section 4
OPERATE
START
OPR_HS_LOC
OPR_LS_LOC
STR_LS_LOC
OPR_HS_REM
OPR_LS_REM
STR_LS_REM
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