By - Jon Brown

Distribution Transformer Fundamentals
August 21-22, 2018 | Denver, CO

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This course has been developed at the request of electric utilities and engineering consulting firms for their staff to gain practical experience with distribution transformers.  The instructor was specifically selected for his skills at presenting complex distribution utility topics in a way that people can understand, remember and apply.  The 80/20 rule, Rules of Thumb, Best Practices, Lessons Learned, and Traps to Watch Out are just a few of the themes in this class.  The real-world examples and practicality of this course will save the students from countless errors down the road. 

This course is intended to be a hands-on, practical course for engineers and consultants. The main purpose of this course is to provide attendees with the knowledge that they need in order to make informed decisions regarding transformer sizing and selection as well as who the major vendors are. The intend of this course is to help companies save time and money. This course will provide attendees with reference materials that they will be able to continually go back to for guidance long after the course is completed, however, this course is not “death by power point” and will encourage discussion and allow attendees to customize the training to meet their educational needs.

Learning Outcomes

  • Discuss transformer theory and calculations
  • Compare transformer types
  • Identify primary and secondary winding connections
  • Determine appropriate transformer sizes for various projects
  • Discuss key IEEE standards regarding distribution transformers
  • Identify common distribution transformer losses and efficiencies
  • Discuss specification writing recommendations and traps to avoid
  • Identify best practices and lessons learned



EUCI has been accredited as an Authorized Provider by the International Association for Continuing Education and Training (IACET).  In obtaining this accreditation, EUCI has demonstrated that it  complies with the ANSI/IACET Standard which is recognized internationally as a standard of good practice. As a result of their Authorized Provider status, EUCI is authorized to offer IACET CEUs for its programs that qualify under the ANSI/IACET Standard.

EUCI is authorized by IACET to offer 1.4 CEUs for this event.


Requirements for Successful Completion of Program

Participants must sign in/out each day, be in attendance for the entirety of the course

Instructional Methods

Case Studies
Power Point presentations
Classroom exercises


Tuesday, August 21, 2018

8:00 – 8:30 a.m. ::  Registration and Continental Breakfast

8:30 a.m. – 4:30 p.m. :: Course Timing

12:00 – 1:00 p.m. :: Group Luncheon

  • Transformer theory and calculations
  • Transformer types
    • Conventional & CSP
    • Overhead and pad-mount
    • Other
    • 1Ø and 3Ø
  • Physical attributes
    • IEEE Standards
    • Design criteria (BIL, clearances, etc.)
    • Enclosure Integrity
    • Cover retention
  • Options and accessories
    • Gauges
    • Pressure relief
    • Switches
    • Valves
    • Relays
    • UL and FM listing
  • Nameplate interpretation
    • Voltage ratings and nomenclature
    • Winding configurations
    • Temperature rise
    • Cooling class
    • Impedance
  • Winding ratios
    • Taps
    • Multi-ratio transformers
  • Primary and secondary winding connections
    • Wye, Delta, Open Wye, Open Delta, etc.
  • Cluster-mounting (banking) of 1Ø transformers

Wednesday, August 22, 2018

8:00 – 8:30 a.m. :: Continental Breakfast

8:30 a.m. – 4:00 p.m. :: Course Timing

12:00 – 1:00 p.m. :: Group Luncheon

  • Load estimating
    • Residential
    • Commercial
    • Industrial
    • Characteristics
    • The Art of Estimating Loads
  • Allowable loading on a transformer
    • Considerations
    • Overloading
  • Transformer sizing
    • Formulas for various configurations
    • Harmonics
  • Inrush considerations
    • Motor load
    • Medical equipment
    • Welders
  • Protection
    • Over-current
    • Over-voltage
  • Fault current calculations
  • Losses and efficiencies
    • DOE Compliance
  • Ferroresonance (and how to prevent it)
  • Insulating liquid options
  • Specification writing recommendations and traps to avoid
  • Best practices
  • Lessons learned


Thomas Callsen, PE, Project Manager, Weldy Lamont Associates

Thomas Callsen has over 30-years of related utility experience. During his 25-years at Commonwealth Edison Company (ComEd), Thomas held numerous engineering roles culminating as a Principal Engineer/Consulting Engineer in the Distribution Standards department where he was responsible for distribution transformers, capacitors, fuses, reclosers and distribution automation hardware.  In 2006 Thomas received DistribuTECH’s prestigious “Project of the Year Award” for his “Distribution Center in a Box” substation.  In 2009 he received the award again for industry’s first real-time overhead fault indicator communicating over a mesh network radio system.  (Both products are now commercially available.)  He received a US patent for the invention of the DC in a Box transformer design. 

In 2010, Thomas joined Weldy Lamont Associates where he is the Project Manager for a rural electrification project in West Africa.  This project includes construction of over 4,000 miles of overhead distribution lines serving over 2,000 rural communities in Ghana.  This project received the 2012 African Energy Award for the “Rural Electrification Project of the Year”.  Thomas has expanded his training to the electric utilities in Ghana where he has incorporated several of the industry’s best practices into the country’s overhead distribution line designs.

Thomas is a Senior Member of the IEEE and an active member of the IEEE Transformer Committee that writes the industry standards for transformers in North America.  Thomas holds a BSEE from the University of Wisconsin – Milwaukee and is a licensed Professional Engineer.


EUCI Office 
4601 DTC Blvd, Suite 800
Denver CO, 80237

Suggested Hotel

Hyatt Place Denver Tech Center
8300 E. Crescent Parkway
Greenwood Village, CO 80111
0.9 miles away
Nightly Rate for EUCI Attendees: $159.00

Click on the following booking link: Hyatt Place Denver Tech Center – EUCI and use Group Code: EUCI or

Call Central Reservations at 888-492-8847 and ask for the EUCI rate of $159 under the corporate/group code EUCI

Other Nearby Hotels

Hyatt Regency Denver Tech Center
7800 E Tufts Ave
Denver, CO 80237
Phone: 303-779-1234
0.3 miles away

Hilton Garden Inn Denver Tech Center
7675 E Union Ave
Denver, CO 80237
Phone: 303-770-4200
0.6 miles away

Denver Marriott Tech Center
4900 S Syracuse St
Denver, CO 80237
Phone: 303-779-1100
0.7 miles away


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