21 - Reliability Models for Electric Power Systems White...

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Reliability Models for Electric Power Systems White Paper #23 Revision 0
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2003 American Power Conversion. All rights reserved. No part of this publication may be used, reproduced, photocopied, transmitted, or stored in any retrieval system of any nature, without the written permission of the copyright owner. www.apc.com 2 Executive Summary This note explains the sources of downtime in Electric Power Systems and provides an explanation for site-to-site variations in Power Availability. The factors affecting power quality from generation to the utilization point are summarized. There is a qualitative description of a model, which can be combined with data to provide a method for estimating down time based on site-related factors.
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2003 American Power Conversion. All rights reserved. No part of this publication may be used, reproduced, photocopied, transmitted, or stored in any retrieval system of any nature, without the written permission of the copyright owner. www.apc.com 3 Background The availability of business systems is significantly impacted by AC mains power quality. The degree to which power quality affects business systems depends on many factors, which include: 1. The quality of the electrical power 2. The downtime caused by factors unrelated to power 3. The ability of the business systems to recover from power problems These factors vary greatly from site to site and from business to business and therefore it is inappropriate to make general statements regarding the impact of power on business process availability. Nevertheless, it is possible to take into account the specific issues of a site and a business and determine the quantitative effect of power problems on business operation. This White Paper explains the components needed to model power quality focusing on power events that lead to the malfunction of information technology equipment. Of the three factors listed above, this note only addresses the first factor. Factors 2 and 3 and the general problem of overall business process availability are the subject of separate White Papers. The Electric Power Distribution System For purposes of understanding the distribution of Electrical Power, the system is typically separated into the following four levels: Bulk Power Power Plants Area Power High Voltage lines
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21 - Reliability Models for Electric Power Systems White...

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