Design Considerations of a Distributed Power Supply System for Telecommunications Network Use Based on Reliability Analyses

Katsuichi YOTSUMOTO  Seiichi MUROYAMA  Hitoshi WATANABE  

IEICE TRANSACTIONS (1976-1990)   Vol.E73   No.3   pp.395-400
Publication Date: 1990/03/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Power Supply

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A distributed power supply system with highly efficient characteristics has been developed to replace conventional centralized power systems in telecommunications offices. In this system as in conventional centralized power systems, a stand-by energy system composed of batteries and engine-generator sets is used as a back-up system for the commericial power lines. However, the distributed power system, except for the engine-generator set, is installed in the telecommunications room. Thus, the floor load limitation is an important design factor. This paper describes a stand-by energy system design that considers floor load conditions and is based on reliability analyses. These analyses show that the distributed power system should be designed as follows: (1) Using a fully duplicated engine-generator set. (2) With battery reserve time reduced to one sixth that of conventional centralized power systems. (3) With transfer switch unavailability designed to be less than one half of the existence switch unavailability.