4. UPS and power supply compatibility

4.1 General approach

The definition of the UPS must take into account the nature and characteristics of the power supply.

• Type of food :

  • low-voltage supply from the public grid ;

  • supplied by a MV/LV transformer ;

  • presence of an alternative source: combustion engine and alternator.

• Power supply characteristics :

  • network topology (single-phase, three-phase with neutral, three-phase without neutral) ;

  • nominal voltage and frequency ;

  • variation...