ABB relion REF615 - Page 126

OR6
B1
B2
B3
B4
B5
B6
O
UPSTEAM_OC_BLOCKINGPHHPTOC2_START
GUID-6B581162-38E0-40FB-95DC-3360616DA749 V1 EN
Figure 129: 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-57913FDC-E766-404A-ABA6-90ADB0F7CF74 V1 EN
Figure 130: 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-042DF7F0-BC45-4B9F-8F1B-301314789714 V1 EN
Figure 131: Negative-sequence overcurrent protection function
Four stages are provided for non-directional earth-fault protection. EFLPTOC2 stage
is dedicated to sensitive earth-fault protection. According to the IED's order code, the
configuration can also include harmonics-based earth-fault protection HAEFPTOC.
Section 3 1MRS756378 S
REF615 standard configurations
120 REF615
Application Manual