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Minimizing disturbances of switching on and switching over in line-interactive uninterruptible power supplies

Lisowski P.

Poznan University of Technology Academic Journals. Electrical Engineering

2007

No 54

133-140

The paper provides an overview of the causes of disturbances occurring in the operation of line-interactive uninterruptible power supplies (UPS). The focus of the paper is on the inrush current of a UPS unit and the delayed reaction of the main relay. A modification of the UPS unit has been proposed, consisting in introducing an additional fast circuit breaker connected in series which will enable inrush current of the main transformer to be reduced while changing operation modes and during switch-on.