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The specification for large UPS systems is becoming more standard, and this presentation is an attempt to highlight some of the less obvious points. The subjects chosen for discussion are input requirements of voltage, isolation and harmonics, together with considerations of the battery and the output filter. Areas for potential savings in energy and cost are investigated.
A new British Post Office standard power plant has been designed to operate from a single-phase a.c. mains or standby generator input, and to provide secure d.c. power to 50 V telecommunications equipment. The plant features standby rectifier capacity, battery standby with a choice of duration, and a regulated output during battery discharge without the need for end-cell switching. A range of standard...
The Swedish Telecommunications Administration - known in Sweden as Televerket - has one of the oldest telephone networks in the world. Advanced product development has enabled very high reliability values to be attained. It has therefore been possible to maintain costs and rates' at a low level. Changeover to digital technique will take place at an accelerated pace by replacement of older equipment...
A high efficiency and economical arrangement for providing power to computers with 400 Hz CPU requirements is introduced. The system utilizes a conventional 60 Hz static switching bypass type 60 Hz UPS connected to a common battery with a switching type redundant 400 Hz solid state UPS thus eliminating the double conversion losses and lower efficiency of an added rotary frequency converter. A method...
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