87T Transformer Differential Relay

The type 87T transformer differential relay provides high speed phase and groud protection for two and three winding power transformers.

The relayhas ratio matching taps and incorporates a second harmonic restraint function where large transformer magnetizing inrush is present. The proportion of second harmonic to fundamental, for restraint, is factory set at 15%, this value is easy adjusted to other amounts as the application may require.

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    ABB contact for United States of America

    Sales: Pete Kovacic
    Service: Cristine Luong
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