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Protection Functions

    • Transformer differential protection (87T)

    • Inrush blocking

    • CT saturation blocking

    • Overexcitation blocking

    • CT circuit failure blocking

    • Amplitude compensation

    • Phase angle compensation

    • Restricted earth-fault protection (64REF)

    • Winding differential protection (87W)

    • Reactor differential protection (87R)

    • Inter-turn fault protection for reactor (21IT)

    • Four zone phase-to-phase distance protection (21T)

    • Four zone phase-to-ground distance protection (21T)

    • Overexcitation protection (24)

    • Phase overcurrent protection (67P, 50/51P)

    • Earth-fault protection (67G, 50/51G)

    • Negative-sequence overcurrent protection (67Q, 50/51Q)

    • Thermal overload protection (49)

    • Breaker failure protection (50BF)

    • Phase undervoltage protection (27P)

    • Phase overvoltage protection (59P)

    • Zero-sequence overvoltage protection (59G)

    • Overfrequency protection (81O)

    • Underfrequency protection (81U)


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