feeder against phase unbalance. Both the negative sequence overcurrent protections
are blocked in case of detection in failure in secondary circuit of current transformer.
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
CCSPVC1_FAIL
CCSPVC1_FAIL
NSPTOC_OPERATE
GUID-67A842F4-BA87-4B21-A921-35B8447380EE V2 EN
Figure 226: 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 or harmonics-based earth-fault protection HAEFPTOC. A
dedicated protection stage INTRPTEF is used 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.
1MRS756378 S Section 3
REF615 standard configurations
REF615 173
Application Manual
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