Multiple winding transformer differential protection


SIPROTEC 5 base module with large display

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    The transformer protection device SIPROTEC 7UT87 is an universal protection, control and automation device on the basis of the SIPROTEC 5 system. It is especially designed for protection of multiple winding transformers (up to 5 sides). Further it is to be used there, where a numerous of measuring points (up to 7 3-pole current measuring points) are required. Another application is simultaneously protection of two parallel transformers (additional fast backup protection).The SIPROTEC 7UT87 is the main protection for the transformer and includes a numerous other protection and monitoring functions. In addition the protection functions can also be used as backup protection for following protected objects (for example cable, line). It also supports modular availability of the hardware.
    The device supports all SIPROTEC 5 system characteristics. It enables futureoriented system solutions with high investment security and low operating costs.

    Main function:

    Up to 2 differential protection with add-onstabilizations (in different function group transformer);
    Up to 5 differential ground-fault protection functions
    For autotransformer applications two differential protection functions in a function group autotransformer can be used.

    Usable measuring point:

    9 three-pole current measuring Points,
    5 one-pole current measuring points,
    5 three-pole voltage measuring Points,
    one-pole voltage measuring points

    Inputs and outputs:

    2 predefined standard variants with
    20 current transformers,
    4 voltage transformers
    15 to 27 binary inputs,
    2 to 38 binary outputs

    Hardware flexibility:

    Flexible adaptable and expandable I/O-quantity structure within the scope of the modular SIPROTEC 5-building blocks

    Width of housing:

    1/3 x 19'' to 2/1 x 19''

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