The basics of transformers, part 2.
Dec 1, 1999, DeDad, John A.
Copper losses in both primary and secondary windings, and core losses are converted into heat in a transformer. These losses are all measured in watts....
Analyzing transformer insulating fluid.
Nov 1, 1999, Miller, George
As part of a complete preventive maintenance program, periodic oil analysis will monitor the condition of power transformers and detect problems before...
The basics of transformers - Part 1
Nov 1, 1999, DeDad, John A.
A transformer is an energy coupling device that takes electrical energy at one voltage (from its source) and transforms it to another voltage. The new...
Transformer Installation Basics
Nov 1, 1999, By Scott Falke
You must power a new office in Warehouse 5. To do this, you need a 3kVA transformer (277V single-phase to 120V, 2-wire) for lighting and a receptacle...
Getting the most from your transformer installation
Oct 1, 1999, Morgan, Robert B.
When your transformer arrives on-site, various assembly and testing procedures must be carried out before placing the unit in service.Your large MVA-sized...
Case of the Double Transformer Failure
Oct 1, 1999, By C. Sankaran, P.E.
A transformer manufacturer tries to minimize construction cost by using solid conductors for tap changer connections. Lack of conductor flexibility appears to be leading cause of problem....
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....
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....
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...
Using single-phase transformers to create 3-phase systems.
Aug 1, 1999, DeDad, John A.
Many older industrial facilities use single-phase, oil-filled transformers made for pole-mounting but installed at ground level to create 3-phase power...
The Basics of 3-phase transformers — part 2
Aug 1, 1999, By Paul Frank, Tel-A-Train
Most large power (and many small distribution) transformer installations provide all three phases. Sometimes they do so with three single-phase units,...
Mounting a Dry-Type Transformer
Aug 1, 1999, By Bruce Bartling, Phillips Swager Associates
Did you hang your dry-type transformer in a location and in a position that will reduce its performance and shorten its life? How do you know?...
Superconducting Transformer (HTS) Successfully Tested
Aug 1, 1999, By EC&M Staff
Is this experimental unit the most powerful superconducting transformer constructed to date? It’s already bringing sweeping changes to transformer and substation design....
Detecting moisture in dry type transformers.
Aug 1, 1999, Campbell, Dean
Resistance testing verifies moisture presence; simple dryout methods eliminate the problem.Failure of dry type transformers can occur during operation...
Guidelines for installing transformers - Part 2.
Jul 1, 1999, Morgan, Robert B.
The successful operation of a transformer is pendent on proper installation as well as on proper design and manufacture. Part 1 of this article, which...
What to know about variable-voltage transformers.
Jul 1, 1999, Morgan, Robert B.
How can you adjust a transformer's voltage range from just a few volts to over 100% input voltage?Variable-voltage transformers are efficient means of...
The Basics of 3-Phase Transformers — Part 1
Jul 1, 1999, By Paul Frank, Tel-A-Train
When connecting transformers, you may have to connect them to single- and 3-phase power sources as well as single- and 3-phase loads. Making the wrong...
Sensible transformer maintenance.
Jun 1, 1999, Raymond, Charles T.
Correct interpretation of maintenance data from transformers is vital for increased reliability, long life, and advanced information on possible need...
Guidelines for installing transformers, part 1.
Jun 1, 1999, Morgan, Robert R.
When your transformer arrives on site, various procedures should be carried out to assure successful operation.The successful operation of a transformer...
Knowing liquid-filled transformer installation requirements.
Jun 1, 1999, Loyd, Richard E.
Knowing NEC, NESC, insurer, and listing agency installation requirements will help you select the best type of insulating medium for the application.Increasing...
NASA Completes Transformer Upgrade with Silicone Fluid
Jun 1, 1999, Edited by Ellen Parson, Managing Editor
Fire safety is always one of the first considerations when you’re specifying a transformer, especially if the unit is close to populated areas or high-value...
How To Witness Test A Transformer—Part 1
Jun 1, 1999, By Patrick K. Dooley, Virginia Transformer Corp.
Before a manufacturer sends a transformer to your site, it conducts various tests. To ensure performance requirements, you may want to witness the testing and inspect the unit yourself....
Wiring multiple buildings from one transformer
May 1, 1999, Hartwell, Frederic P.
There are practical industrial applications for wiring several buildings from one transformer, but does it meet Code?A new controversy has come up on...
Guidelines for transformer application designs.
May 1, 1999, Moran, Robert B.
You must evaluate various factors when choosing a transformer so that it meets both the needs of the load and the application.The time you spend in selecting...
The basics of transformers. (part 5)
Mar 1, 1999, DeDad, John A.
Precise lead or terminal designation is very important. There are specific parameters affected by terminal markings and coil relationships, and how we...
