ABB relion REF615 Applications Manual page 210

Section 3
REF615 standard configurations
204
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.
BLOCK
GUID-48CCCD5A-6F4F-4FF7-9D75-85E2B0DDD8A9 V1 EN
Figure 282: 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. Both negative sequence overcurrent protections are
blocked in case of detection in failure in secondary circuit of sensor.
CCSPVC1_FAIL
CCSPVC1_FAIL
NSPTOC1_OPERATE
NSPTOC2_OPERATE
GUID-863218A0-49A4-400F-A05E-8E9954E4B722 V2 EN
Figure 283: 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 or wattmetric-based earth-
fault protection WPWDE.
INRPHAR1
BLK2H
NSPTOC1
BLOCK OPERATE
ENA_MULT START
NSPTOC2
BLOCK OPERATE
ENA_MULT START
OR
B1
B2
1MRS756378 S
INRPHAR1_BLK2H
NSPTOC1_OPERATE
NSPTOC1_START
NSPTOC2_OPERATE
NSPTOC2_START
O
NSPTOC_OPERATE
Application Manual
REF615