ABB relion REF615 Applications Manual page 150

Section 3
REF615 standard configurations
144
BLOCK
GUID-B5386A2A-119F-44AF-AD39-D601263BF734 V1 EN
Figure 171: 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 of a failure in secondary circuit of current transformer.
CCSPVC1_FAIL
CCSPVC1_FAIL
NSPTOC1_OPERATE
NSPTOC2_OPERATE
GUID-471A4DEC-98C0-4E2B-8A82-CC7D8AA94D1D V2 EN
Figure 172: 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. In addition, there is a dedicated protection stage
INTRPTEF either for transient-based earth-fault protection or for cable intermittent
earth-fault protection in compensated networks.
The binary input X110:BI2 is intended for controlling directional earth-fault
protection blocks' relay characteristic angle (RCA: 0°, -90°) or operation mode
(IoSinφ, IoCosφ) change. The same input is also available for wattmetric protection.
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