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UPS related websites

• APC have a large number of interesting white papers. Below are just a few of the more salient pdf's.
  A full list of the documents is here
  
  APC white paper #1 The different types of UPS systems
  This article is really good. Even more so if that it mentions competitors products alongside their own!
  There is much confusion in the marketplace about the different types of UPS systems and their characteristics. Each of these UPS types is defined, practical applications of each are discussed, and advantages and disadvantages are listed. With this information, an educated decision can be made as to the appropriate UPS topology for a given need.
  
  APC white paper #8 Inter-System Ground Noise: Causes and Effects
  It makes the point that there's a difference between 'common mode noise' and 'inter-system ground noise', listing the causes and differences.
  Many power-related problems are the result of Inter-System Ground Noise. This problem cannot be corrected using typical AC-only power protection equipment. The cause and solution of Inter-System Ground Noise problems are described.
  
  APC white paper #9 Common mode susceptibility of computers
  This is rather good too and looks and the truths - and myths - of transients spike and line noise. It points out how 'power conditioners' aren't anywhere near as essential (as some power conditioners make out) because modern switching power supplies in computers filter a lot of it out anyway.
  This Technical Note examines and challenges the claims made in literature regarding the alleged high susceptibility of computers to common mode noise.
  
  
• Always "On"™ UPS Systems of Canada have this PPT engineering presentation for those of you more those wanting more technical detail. I found it particularly good.
  
  
• Ars Technica: Uninterruptible Power Supplies
  
  
• Carebase, a reseller in Colorado have some good links and articles.
  
  
• Crutchfield advisor, the complete A/V information web site: Power Protection Glossary
  
  
• EC&M magazine: Harmonics made simple
  
  
• EC&M magazine: Harmonic Distortion: Definitions And Countermeasures
  
  
• EC&M magazine: Power Quality articles
  
  
• Energy Technologies, Inc: Power Glossary
  
  
• How Stuff Works: Surge protectors
  
  
• All Liebert white papers
  
  
• Liebert: Evaluating the economic impact of UPS technology
  I'd class this particular one as recommended reading.
  
  
• Liebert: The Basics of UPS Technology
  
  
• Liebert: How to Protect Your Computer from Surges, Outages & Other Power Problems: Selecting and Sizing a Small UPS
  
  
• Liebert: Power protection for small networks and standalone systems
  
  
• Liebert: (pdf) Five questions to ask before selecting power protection for critical systems
  
  
• MGE: UPS glossary. Concise
  
  
• MGE: UPS topologies and standards.
  Leaning towards technical rather that a basics introduction, but good for those looking for circuit diagrams.
  
  
• Nation Grid, US
  
  
• Nation Grid, UK
  
  
• NIST: (pdf) Surges Happen! How to protect your home.
  
  
• Power Factor Inc: Symptoms of Power Problems
  
  
• Power Factor Inc: 9 Power Problems
  
  
• Powerware's Power and Product Glossary
  
  
• Riello: Power Supply Problems (pdf)
  
  
• Riello: What To Look For When Buying An Uninterruptible Power System
  
  
• White Paper Article: What’s UPS?
  By Jorma Mannerkoski, Director of Product Marketing, PowerWare Corporation
  
  
• Stedi-Power have several interesting articles too.