Reliability level versus load-carrying capacity of the uninterruptible power systems (UPS)

The paper addresses the electric energy power supply, with particular emphasis on the functioning of the uninterruptible power supply systems (UPS). There were conducted considerations associated with the possibilities of covering the increasing demand for energy (as a result of the load infrastructure development) by parallel combining of the UPS power supplies. There were also analysed the possibilities of providing the expected reliability of the power supply of the priority loads as the effect of the redundancy introduction in the system. There are described the functional properties of the basic redundant UPS structures. The obtained results of studies performed in the UPS EVER POWERLINE GREEN 33 systems have been presented and commented on.