The upstream blocking from the start of the second low stage of three-phase non-
directional overcurrent protection PHLPTOC2 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_BLOCKINGPHLPTOC2_START
GUID-97C38BE4-34C3-408A-95E1-3AD7BEBD8588 V1 EN
Figure 563: 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-4BBC0DE7-8C67-4E17-A6CF-F0D0E5535D53 V1 EN
Figure 564: 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-D2BCBB3A-C69C-438B-BC3F-31C77B49BCC5 V1 EN
Figure 565: Negative sequence overcurrent protection function
Four non-directional earth-fault stages and three directional earth-fault stages are
offered earth-fault protection. However in the configuration three non-directional
earth fault stages are considered. One stage is dedicated to sensitive earth-fault
protection EFLPTOC2. 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
Section 3 1MRS756378 S
REF615 standard configurations
360 REF615
Application Manual
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