ABB relion REF615 - Page 269

The upstream blocking from the start of the second low stage of three-phase
directional overcurrent protection DPHLPDOC2 is connected to the binary output
X110:SO1. This output can be used for sending a blocking signal to the relevant
overcurrent protection stage of the IED at the infeeding bay.
OR6
B1
B2
B3
B4
B5
B6
O
UPSTEAM_OC_BLOCKINGDPHLPDOC2_START
GUID-E879BBBA-BEA6-4F5B-B22D-D183E8B345AA V1 EN
Figure 388: Upstream blocking logic
The output BLK2H of three-phase inrush detector INRPHAR1 enables either blocking
the function or multiplying the active settings for any of the available overcurrent or
earth-fault function blocks.
INRPHAR1
BLOCK BLK2H
INRPHAR1_BLK2H
GUID-5F2F3BE0-927A-42F0-9413-CDA6C0FEC0F8 V1 EN
Figure 389: Inrush detector function
Two negative-sequence overcurrent protection stages NSPTOC1 and NSPTOC2 are
provided for phase unbalance protection. These functions are used to protect the
feeder against phase unbalance.
NSPTOC1
BLOCK
ENA_MULT
OPERATE
START
NSPTOC2
BLOCK
ENA_MULT
OPERATE
START
OR
B1
B2
O
NSPTOC1_OPERATE
NSPTOC1_OPERATE
NSPTOC2_OPERATE
NSPTOC2_OPERATE
NSPTOC1_START
NSPTOC2_START
NSPTOC_OPERATE
GUID-7196E7DF-D646-46E6-926E-736FA68E1350 V1 EN
Figure 390: Negative-sequence overcurrent protection function
Three stages are provided for directional earth-fault protection. According to the
IED's order code, the directional earth-fault protection method can be based on
conventional directional earth-fault DEFxPDEF only or alternatively used together
with admittance-based earth-fault protection EFPADM, wattmetric-based earth-fault
protection WPWDE or harmonics-based earth-fault protection HAEFPTOC. In
addition, there is a dedicated protection stage INTRPTEF either for transient-based
1MRS756378 S Section 3
REF615 standard configurations
REF615 263
Application Manual