3.4.3.1 Functional diagrams for protection
The functional diagrams describe the protection relay's protection functionality in
detail and according to the factory set default connections.
Line differential protection with in-zone power transformer LNPLDF1 is intended to
be the main protection offering exclusive unit protection for the power distribution
lines or cables. The stabilized low stage can be blocked if the current transformer
failure is detected. The operate value of the instantaneous high stage can be multiplied
by predefined settings if the ENA_MULT_HS input is activated. In this configuration,
it is activated by the open status information of the remote-end circuit breaker and
earth switch, and if the disconnector is not in the intermediate state. The intention of
this connection is to lower the setting value of the instantaneous high stage by
multiplying with setting High Op value Mult, in case of internal fault.
Alarm LED3 informs when the line differential is not available possibly due to a
failure in protection communication, or if the function is set in a test mode.
OR
B1
B2
O
OR
B1
B2
O
OR
B1
B2
O
NOT
IN OUT
OR
B1
B2
O
OR
B1
B2
O
LNPLDF1
BLOCK
BLOCK_LS
ENA_MULT_HS
OPERATE
START
STR_LS_LOC
STR_LS_REM
OPR_LS_LOC
OPR_LS_REM
OPR_HS_LOC
OPR_HS_REM
BLKD2H_LOC
BLKD2H_REM
PRO_ACTIVE
REMOTE_FEEDER_READY
LNPLDF1_OPERATE
CCSPVC1_FAIL
REMOTE_CB_OPEN
REMOTE_CCSPVC_FAIL
LNPLDF1_OPR_LS_LOC
LNPLDF1_OPR_LS_LOC
LNPLDF1_OPR_LS_REM
LNPLDF1_OPR_LS_REM
LNPLDF1_PROT_ACTIVE
LNPLDF1_PROT_ACTIVE
LNPLDF1_OPR_HS_LOC
LNPLDF1_OPR_HS_LOC
LNPLDF1_OPR_HS_REM
LNPLDF1_OPR_HS_REM
LNPLDF1_BLKD2H_LOC
LNPLDF1_BLKD2H_LOC
LNPLDF1_BLKD2H_REM
LNPLDF1_BLKD2H_REM
LNPLDF_LS_OPERATE
LNPLDF_HS_OPERATE
LNPLDF1_PROT_NOT_ACTIVE
LNPLDF_RSTD2H
LNPLDF1_START
GUID-611D4EF5-AABC-487D-A52C-DF018335EC23 V2 EN
Figure 58: Line differential protection functions
Four overcurrent stages are offered for overcurrent and short-circuit protection. Three
of them include directional functionality DPHxPDOC. Three-phase non-directional
overcurrent protection, instantaneous stage, PHIPTOC1 can be blocked by energizing
the binary input X120:BI1.
Section 3 1MRS758127 C
RED615 standard configurations
68 RED615
Application Manual
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