By - Jon Brown

Distribution Transformer Fundamentals
October 9-10, 2019 | Houston, TX

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If this event is of interest you may also be interested in this related event

Distribution Over-Current Protection – Fuses and Reclosers, October 11, 2019 in Houston, TX

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 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 and Classroom exercises


Wednesday, October 9, 2019

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

Thursday, October 10, 2019

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.


Royal Sonesta Houston

2222 West South Loop

Houston, TX 77027

Reserve your room:

please call 1-713-627-7600

Room Block Reserved For:

Nights of October 8 – 10, 2019

Room rate through EUCI:

$199.00 single or double plus applicable taxes
Make your reservations prior to September 8, 2019.


Please Note: Confirmed speakers do not need to register and are encouraged to participate in all sessions of the event. If you are a speaker and have any questions please contact our offices at 1.303.770.8800

EventEarly Bird Before
Friday, September 20, 2019
Standard RateAttendees
Distribution Transformer FundamentalsUS $ 1295.00 US $ 1495.00

This event has the following related events:

Distribution Over-Current Protection - Fuses and ReclosersUS $ 895.00 US $ 995.00

Take advantage of these discounts!

  • Attend the Course and Distribution Over-Current Protection - Fuses and Reclosers and pay US $ 2,095.00 per attendee (save US $ 95.00 each)

Register 3 Send 4th Free!

Any organization wishing to send multiple attendees to these conferences may send 1 FREE for every 3 delegates registered. Please note that all registrations must be made at the same time to qualify.

Cancellation Policy

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 September 06, 2019 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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