Low Impedance Centralized Busbar Protection

SIPROTEC 7SS85

Description

SIPROTEC 7SS85 Busbar Protection Relay

Front view

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    The SIPROTEC 7SS85 busbar protection is a selective, safe and fast protection against busbar short circuits in medium voltage systems, high voltage systems, and systems for very high voltage with a large variety of busbar configurations. Selection of the device base functionalities (significant properties) and the modular hardware structure permit optimum adaptation of the SIPROTEC 7SS85 to a large variety of system configurations and functional requirements up to a comprehensive station protection.

    Selection of the device base functionalities (significant proper- ties) and the modular hardware structure permit optimum adaptation of the SIPROTEC 7SS85 to a large variety of system configurations and functional requirements.



    Functionality
    The centralized busbar protection SIPROTEC 7SS85 encompasses the following maximum quantity structure:

    • 20 3-phase measuring points (current transformer)

    • 4 3-phase measuring points (voltage transformer)

    • 26 bays (feeders, couplers, bus-section disconnections)

    • 6 bus zones (busbar sections with measuring function)

    • 6 couplers (with 1 or 2 current transformers)

    • 3 auxiliary busbars (busbar sections without measuring function)

    • Phase-selective measurement and Display

    • Selective tripping of faulty busbar sections

    • Optional additional decentralized binary in- and outputs via protection interface (PI) or IEC 61850 (GOOSE) provide new concepts for busbar protection



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