GUID-33B6922D-228D-4D26-98AF-6043981814C0 V1 EN
Figure 109: Unbalance protection
Two negative-sequence overcurrent stages NSPTOC1 and NSPTOC2 and one phase
discontinuity stage PDNPSTOC1 are offered for unbalance protection. The phase
discontinuity protection PDNPSTOC1 provides protection for interruptions in the
normal three-phase load supply, for example, in downed conductor situations.
The operate signals of these unbalance protections are connected to the Master Trip
and to alarm LED 3.
Section 3 1MRS757456 D
REF611 standardized configurations
128 REF611
Application Manual
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