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Protection Functions

    • Six stages phase overcurrent protection (50/51P)

    • Six stages earth-fault protection (50/51G)

    • Two stages negative-sequence overcurrent protection (50/51Q)

    • Undercurrent protection (37)

    • Two stages phase overvoltage protection (59P)

    • Positive-sequence overvoltage protection (59Pos)

    • Two stages negative-sequence overvoltage protection (59Q)

    • Two stages residual overvoltage protection (59G)

    • Two stages phase undervoltage protection (27P)

    • Six stages overfrequency protection (81O)

    • Six stages underfrequency protection (81U)

    • Six stages rate-of-change of frequency protection (81R)

    • Two stages reverse power protection (32R)

    • Breaker failure protection (50BF)

    • Transfer trip (TT)

    • Auto-reclosing (79)


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