Transformers
Sep 1, 2009, By Beck Ireland, Staff Writer
In Alameda, Calif., a single-screen movie theater was restored to its original purpose and Art Deco glory after incarnations as a roller skating rink...
The Basics of Instrument Transformers Part 1
May 1, 2009,
Understanding the potential transformer (PT), a conventional, single-phase transformer that has its primary and secondary windings on a common core...
Using Single-Phase Transformers to Create 3-Phase Systems
Apr 1, 2009,
The basics of using delta-connected systems and wye-wye connected systems...
The Case of Overheated Transformers and Neutral Conductors
Sep 1, 2008, By Steven L. Pay, P.E., L.C., LEED AP, Finnegan Erickson Associates
Historically, typical loads of commercial power systems have been predominately linear; however, in the last few decades, a significant portion of these...
Article 450: Transformers and Transformer Vaults
May 1, 2008, By Mike Holt, NEC Consultant
The operation of any facility depends on power distribution, which, in turn, depends on transformers. Safe and reliable operation of transformers is crucial...
Transformer Secondary Conductors
Feb 1, 2008, By Mike Holt, NEC Consultant
Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing. Let's take a closer look at 240.21(C)...
DOE Sets New Efficiency Standards for Utility Transformers
Nov 1, 2007,
Last month, the U.S. Department of Energy (DOE) published a final rule establishing new energy-efficiency standards for distribution transformers. The...
The Basics of Large Dry-Type Transformers
Jun 1, 2007, By Keith Lane, P.E., SASCO
Like all of the electrical distribution equipment serving critical systems, transformers are a key component. That's why it's crucial to evaluate your...
Evaluating Motor and Transformer Inrush Currents
Dec 1, 2006, By Mark McGranaghan, EPRI Solutions, and Fred Kinder, Dranetz-BMI
Inrush currents associated with motor starting and transformer energizing can cause interaction problems with other loads in a facility or on the power...
Understanding The Basics of Wye Transformer Calculations
Dec 1, 2004, By Mike Holt, NEC Consultant
Add this information to what you know about delta transformers and you may be ready to solve power quality problems...
The Ups and Downs of Transformer Installations
Nov 30, 2004, By Mike Holt, NEC consultant
Step up your knowledge of NEC transformer requirements...
The Basics of Transformers
Aug 1, 2003, By R. Fehr, P.E., Engineering Consultant
By raising and lowering voltage levels, transformers make power systems versatile...
Keep Your Transformer Working Like a Well-Oiled Machine
Apr 1, 2003, By Scott D. Reed, Environmental Protection Services
Just like a car, your transformer needs regular oil conditioning to rid it of harmful contaminants that could shorten its life...
Transformer Installation Made EasySort of
Jul 1, 2002, By Mike Holt, NEC Consultant
OK, it won't be easy, but these five steps will help your next transformer installation run more smoothly....
Dissolved Gases Reveal Your Transformer's State of Health
Feb 1, 2002, By C. Patrick McShane, Cooper Power Systems
Effective transformer maintenance depends on dissolved gas analysis....
The Basics of Autotransformers
Oct 1, 2001, DeDad, John A.
An autotransformer is a transformer having part of its winding included in both the input and output circuit. A simple autotransformer connection is shown...
Choosing Transformers for Power Distribution Projects
Aug 1, 2001, By Mark Lamendola, Technical Editor
Follow these basic steps to select the best transformer for each phase of your next project....
The Basics of Delta-Wye Transformers
Dec 1, 2000, By C. Sankaran
The electrical configuration of the delta-wye transformer makes it the most popular transformer connection in the world. When it comes to making proper...
Basics of Transformer Voltage Efficiency
Sep 1, 2000, By Mark Lamendola
Efficiency is a function of a transformer's power losses, but it's easy to lose sight of what transformer efficiency means in the real world....
The Basics of Transformer Voltage Regulation
Aug 1, 2000, By Mark Lamendola
It's easy to lose sight of what voltage regulation means in the real world....
The Basics of Zigzag Transformers
Jul 1, 2000, By C. Sankaran, P.E.
These transformers have special windings, appropriate for special applications....
Silicone Transformers Improve Fire Safety
Jul 1, 2000, Edited by Ellen Parson, Managing Editor
Consultants specify liquid silicone-filled transformers at media manufacturing plant to increase efficiency and improve fire safety of this power delivery system....
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....
Testing isolation transformers for attenuation.
Dec 1, 1999, Lewis, Warren L.
Measuring common-mode current, not voltage, will provide a real-world measure of isolation transformer attenuation.How can the performance of electrostatic...
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,...
