Paralleling Device



Perspective View

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    Paralleling device SIPROTEC 7VE85 is specifically designed for the synchronization of generators (power plant units) with the power grid or synchronization of 2 electricity-supply systems.

    The 1.5- and 2-channel synchronization function is the made function of the SIPROTEC 7VE85. To warrant a high level of security and reliability, the software works with various monitoring functions. In addition, the most important hardware components are duplicated. Two different measuring algorithms are used in accordance with the multi-channel redundancy. This avoids overfunctions through systematic errors. At the same time, the different methods of measurement are applied and processed independently of each other with different memory areas. The high level of reliability and flexible options to adapt to the equipment requirements allow a wide variety of applications.

    Main function

    1.5- and 2-channel synchronization function

    Inputs and outputs

    2 predefined standard variants with up to 8 current transformers, 8 voltage transformers, 7 to 15 binary inputs, 14 to 20 binary outputs

    Hardware flexibility

    Flexibly adjustable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5 system; 1/6 expansion modules can be added, available with large or small display, or without display

    Width of housing

    1/3 × 19 inches to 2 × 19 inches

    The SIPROTEC 7VE85 recognizes the operating conditions automatically and reacts in accordance with the settings. In
    “Switching synchronous electrical power systems” operating mode the frequency difference is measured with a high level of accuracy. If the frequency difference is almost zero for a long time, this is referred to as a synchronous electrical power
    system, for which a wider switching angle can be permitted.

    If asynchronous conditions occur, such as when synchronizing the generators, the speed is automatically adjusted to the power frequency and the generator voltage in an electrical power system. It is then switched, taking into consideration the
    synchronization in accordance with the circuit breaker closing time.

    The 1.5-channel parallel switching function (synchronization function and synchrocheck) is provided for use in small to
    medium-sized generators and in electrical power systems. This function is more secure than a 1-channel paralleling device and can also be used for synchrocheck applications. For larger Generators and electrical power systems with high safety requirements, the 2-channels parallel switching function is recommended.
    In this example two distinctly independent methods of measurement decide on the switching conditions.

    Furthermore, SIPROTEC 7VE85 offers additional current, frequency, power and voltage protection functions and many
    other control and monitoring functions. As a result, the paralleling device offers synchronization and protection functions in a single device. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7VE85 device offers future-oriented system solutions with high investment security and low operating costs.

    The following modes of operation are covered:

    • Switching synchronous/asynchronous electrical power systems

    • Switching to de-energized line or dead busbar

    • Synchrocheck function

    • Adjusting commands for voltage and frequency (speed)