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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:
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the substation's auxiliary power transformer;
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voltage transformers;
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auxiliary power supply circuits;
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current transformers of the protected connection.
Device models differ in the availability of certain inputs.
The MIR PSUV has 3 inputs:
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Combined voltage input;
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2 AC voltage inputs.
The MIR PSUC has 4 inputs:
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Combined voltage input;
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1 AC voltage input;
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2 AC current inputs.
MIR PSU-C and MIR PSU-C:
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Additional storage capacitor.
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