STR_LS_LOC
STR_LS_REM
OPR_LS_LOC
OPR_LS_REM
OPR_HS_LOC
OPR_HS_REM
OPR_LS_A
OPR_LS_B
OPR_LS_C
Stabilized
low stage
OR
SEND
STR_LS_A
STR_LS_B
STR_LS_C
OR
SEND
OPR_HS_A
OPR_HS_B
OPR_HS_C
OR
SEND
OPR_LS_A
OPR_LS_B
OPR_LS_C
OR
RECEIVE
STR_LS_A
STR_LS_B
STR_LS_C
OR
RECEIVE
OPR_HS_A
OPR_HS_B
OPR_HS_C
OR
RECEIVE
Inst.
high stage
PICKUP
TRIP
OR
OR
GUID-271C0849-2D46-44A9-A6C6-AA576F2A0DF6 V1 EN
Figure 234: Operation logic of the direct intertrip function
The pickup and trip signals are also provided separately for the low and high stages, and
in 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.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 481
Technical Manual
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