Digital Grid Digital Grid


Differential Protection Device


SIPROTEC 5 base module with large display

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    The SIPROTEC 7SD87 differential protection device is suitable for the selective protection of overhead lines and cables with single- ended and multi-ended infeed of all lengths with up to 6 ends. Transformers and compensating coils in the protection range are also possible. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SD87 device offers future-oriented system solutions with high investment security and low operating costs.

    Main function:

    Differential Protection


    1-pole and 3-pole, minimum tripping time: 9 ms

    Inputs and outputs:

    12 predefined standard variants with 4/4 or 8/8 current transformers/voltage transformers, 5 to 31 binary inputs, 8 to 46 binary outputs

    Hardware flexibility:

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

    Housing width:

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