Multiple winding transformer differential protection


SIPROTEC 5 base module with large display

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    The SIPROTEC 7UT87 transformer differential protection has been designed specifically for the protection of multi-winding transformers (up to 5 sides). Furthermore, it is to be used where numerous measuring points (up to 9 3-phase current measuring points) are required. Another application is simultaneous protection of two parallel transformers (additional fast backup protection). The SIPROTEC 7UT87 is the main protection for the trans- former and contains many other protection and monitoring functions. The additional protection functions can also be used as backup protection for subsequent protected objects (such as cables or lines). With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, SIPROTEC 7UT87 offers future-oriented system solutions with high investment security and low operating costs.

    Main function:

    Up to 3 differential protection functions with additional stabilization (in different trans- former function groups); up to 5 ground fault differential protection functions.

    For auto transformer applications, two differ- ential protection functions can be processed in an Auto transformer function group.

    Usable measuring points:

    9 x 3-phase current measuring points, 5 x 1- phase current measuring points, 5 x 3-phase voltage measuring points

    Inputs and outputs:

    2 predefined standard variants with 20 current transformers, 4 voltage transformers, 15 to
    27 binary inputs, 22 to 38 binary outputs

    Hardware flexibility:

    Flexibly adjustable and expandable I/O quantity structure within the scope of the SIPROTEC 5 modular system.

    Width of housing:

    2/3 × 19 inches to 2/1 × 19 inches

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