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MIR

PSU

Power Supply Unit

The power supply unit (PSU) provides uninterruptible power to microprocessor-based relay protection and automation devices at substations with DC/AC operating current.
Depending on the design, the PSU can be connected to:

  • the substation's auxiliary power transformer;

  • voltage transformers;

  • auxiliary power supply circuits;

  • current transformers of the protected connection.


Device models differ in the availability of certain inputs.

The MIR PSUV has 3 inputs:

  • Combined voltage input;

  • 2 AC voltage inputs.

The MIR PSUC has 4 inputs:

  • Combined voltage input;

  • 1 AC voltage input;

  • 2 AC current inputs.

MIR PSU-C and MIR PSU-C:

  • Additional storage capacitor.

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