Powering a City Within a City
Jul 1, 2000, By Jim Berard, Eli Sherman, and James Daley, P.E.
The sophisticated power monitoring and control system at Sprint World Headquarters Campus allows facility engineers to override automatic load-trip orders and permit load shedding or peak shaving as necessary....
Making Short-Circuit Calculations Easy
Jun 1, 2000, By John Paschal, P.E.
Using the new kVA method, you only need one calculation to determine the short-circuit values at every point within an entire electrical power system....
Don't Let Lightning Catch You Off Guard
Jun 1, 2000, By John Paschal, P.E.
Although there are a number of lighting protection systems available, the decision of which one's right for your facility basically comes down to what you're trying to protect....
Generators Answer Need for Backup Power
May 1, 2000, Edited by Ellen Parson, Managing Editor
Utility company signs more than a dozen clients, who require 75kW or more demand per month, to its new backup generator service (BGS) program....
Power Monitoring: Dispelling Meter Myths
May 1, 2000, By Dennis Stewart, P.E.
Understanding the capabilities of your monitor will help you interpret readings more accurately when investigating power quality problems....
The Highs and Lows of Motor Voltage
May 1, 2000, By Ed Cowern, P.E.
Operating a motor at the "outer limits" of its voltage requirements reduces its efficiency and causes premature failure....
In Sync with Engine Gensets
Feb 1, 2000, By Donald Berozi, P.E.
Synchronization and load sharing between old and new multiple engine gensets are possible with digital controls and existing analog components....
Selecting the Right Battery for the Job
Feb 1, 2000, By Glenn Alber and Mark Lamendola
Battery selection is no easy task. Using the same battery in two different applications may give you excellent performance in one instance and a complete failure in another....
Why the Scramble for On-Site Power?
Feb 1, 2000, By Mark Lamendola, Technical Editor
On-site power generation got attention during last year's Y2K mania. But, the real driver for such capability is far more substantial than concerns over...
Paralleling System Keeps Power Primed
Jan 1, 2000, Edited by Ellen Parson, Managing Editor
New gensets enable adhesives manufacturer to ensure reliable power, control peak demand, and save money through utility rebate program....
Keep Up to Speed with Motor Terms
Jan 1, 2000, By Ed Cowern, P.E.
Avoid mistakes with selection/maintenance by learning the language of motors....
How to perform short-circuit calculations, part 2.
Dec 1, 1999, Mercede, Frank J.
Performing short-circuit calculations requires an understanding of various system components and their interaction.In Part 1 of this article, which was...
Unconventional Transformer Connections — Part 2
Dec 1, 1999, By Scott Falke, Turlock, Calif.
Part 1 showed us how to use unconventional transformer configurations to resolve equipment availability problems and unusual circumstances. Part 2 provides more examples, and a look at the tradeoffs involved. Let's begin with Case Five....
Reduced-Voltage Autotransformer Starter Performance Misunderstood
Dec 1, 1999, By EC&M Staff
The author of the article “Reduced-Voltage Starters: Choosing The Best Type For Your Application” (June 1998 issue) made an error with the following excerpt,...
Using Arc-Fault Circuit Interrupters To Reduce Residential Fires
Nov 1, 1999, George D. Gregory
Possibly coming soon to an electrical distributor near you is the arc-fault circuit interrupter (AFCI). Although they may seem like just another new industry...
Flywheel technology improves power quality at Ohio power company
Nov 1, 1999, By EC&M Staff
When American Electric Power (AEP), Columbus, Ohio, designed its new energy delivery headquarters, power quality was at the top of its list of concerns....
Unconventional Transformer Connections — Part 1
Oct 1, 1999, By Scott Falke
Sometimes, budget constraints keep you from buying a new transformer for a specific application. You already have a boneyard of transformers; can you make do with what you have? In many cases, the answer is yes....
Don't Be Left Short by Current Transformers
Oct 1, 1999, By C. Sankaran, P.E.
Don’t get fooled by current transformer ratings and applications....
The Power of Design/Build: Teamwork Fuels Success
Oct 1, 1999, David Mozur, P.E.
Although there is a variety of design and construction project delivery methods for owners to choose from, design/build continues to grow in popularity....
Can four 5kVA buck-boost transformers supply a 20kVA load?
Oct 1, 1999, Lawrie, Robert J.
Q Can I connect four 5kVA buck-boost transformers in parallel to supply a 20kVA load? - L.J.F.A Four 5kVA buck-boost transformers can be connected in...
