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-276B1260-5C99-44E4-97BA-AFBB50464E46 V1 EN
Figure 20: 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 is based on
conventional directional earth-fault DEFxPDEF only or used alternatively 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.
1MRS756378 S Section 3
REF615 standard configurations
REF615 55
Application Manual
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