Distribution Transformer Fundamentals

Distribution Transformer Fundamentals

August 25-26, 2020 | 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 intent 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 is accredited by the International Accreditors for Continuing Education and Training (IACET) and offers IACET CEUs for its learning events that comply with the ANSI/IACET Continuing Education and Training Standard. IACET is recognized internationally as a standard development organization and accrediting body that promotes quality of continuing education and training.

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 and Classroom exercises


Tuesday, August 25, 2020

8:00 – 8:30 a.m. :: Registration & 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 26, 2020

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 Conference Center

6400 S Fiddlers Green Cir.

Greenwood Village CO, 80111

The EUCI conference center is conveniently located adjacent to the Arapahoe at Village Center Light Rail Station, allowing easy access to and from DIA, Downtown, and Local Area Attractions.

Nearby Hotels

Each of these hotels offers a complimentary shuttle to and from the EUCI conference center.

Hyatt Regency Denver Tech Center
7800 East Tufts Ave
Denver, CO 80237
Phone: 1-303-779-1234
2.8 miles away
Special EUCI Room Rate: $179.00
To access EUCI room rate visit denvertechcenter.regency.hyatt.com
Click “Book Now”, then click “Special Rates”
Click “Corporate or Group Code” and enter CR102338
You may also call our central reservation at 1-800-233-1234 and give them the corporate code of CR102338

Double Tree by Hilton DTC
7801 East Orchard Rd.
Greenwood Village, CO 80111
Phone: 303-779-6161
0.5 miles away

Wingate by Wyndham
8000 East Peakview Ave
Greenwood Village, CO 80111
Phone: 303-626-2641
0.3 miles away

Hyatt Place Denver Tech Center
8300 E.Crescent Parkway
Greenwood Village, CO 80111
Phone: 1-303-804-0700
2.1 miles away

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



Distribution Transformer Fundamentals

August 25-26, 2020 | Denver, CO
Individual attendee(s) - $ 1495.00 each

Buy 4 seats and only pay for 3! For this event every fourth attendee is free!

Your registration may be transferred to a member of your organization up to 24 hours in advance of the event. Cancellations must be received on or before July 24, 2020 in order to be refunded and will be subject to a US $195.00 processing fee per registrant. No refunds will be made after this date. Cancellations received after this date will create a credit of the tuition (less processing fee) good toward any other EUCI event. This credit will be good for six months from the cancellation date. In the event of non-attendance, all registration fees will be forfeited. In case of conference cancellation, EUCIs liability is limited to refund of the event registration fee only. For more information regarding administrative policies, such as complaints and refunds, please contact our offices at 303-770-8800

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