OPS Workshop Seminar

Basic Principles of Transformer Design Seminar

Principles of Inductor Design Seminar

Transformer Design Decision Seminar

Ferroresonant Design Seminar

THURSDAY MARCH 23rd 2023 Seminar at the TTA Spring Meeting

Join us at the Transformer Association Spring Meeting for the Transformer Design Seminar hosted by Optimized Program Service.  Event details can be viewed at

To Register to attend the Basic Principles of Transformer Design Seminar please email

Seminar will be held at Doubletree by Hilton Hotel Orlando Sea World.  

10100 International Drive, Orlando FL 32821

Registration deadline is March 3. 

After attending these seminars, you will feel confident to design without any application tools or software programs.  These seminars are intended for technical personnel who want to learn and review the basic principles of transformer design from initial to end stages of the design.  We will be providing design examples and concepts of transformer design using hand calculations.


Who should attend?

  • Engineers looking to familiarize designing transformers by using hand calculations
  • New OPS software users and engineers who will be using OPS in the future

For inquiries, please email or call 440-238-0700.  We are looking forward to seeing you at the event!


Topics of Discussion Included:

Right: Designing Transformers with hand calculations!

Basic Magnetic Relationships

A. Magnetic Flux
B. Field Intensity
C. Permeability
D. Induced Voltages

Derivation of Basic Design Expressions

A. Volts Per Turn
B. Power
C. Ampere-Turns

Equivalent Circuit

A. Vector Diagrams of Voltage
     1. Primary Voltages
     2. Secondary Voltages

Basic Principles of Transformer Design Seminar
transformer design hand calculations seminar

Left: Transformer Design hand calculations-comparing results with software

Core Considerations

A. Construction
     1. Tool Made Laminations
     2. Wound Cores
        a. Cut C Cores
        b. Distributed Gap Cores
        c. Toroids
     3. Lay-up Cores (Strip)
B. Materials
     1. Grades
     2. Gauges
     3. Alloys
C. Core-Coil Construction
     1. Simple
     2. Core
     3. Shell
     4. Three-Phase

Conductor Type

A. Shapes
     1. Round
     2. Square
     3. Rectangular
     4. Foil or Strip
B. Materials
     1. Copper
     2. Aluminum
C. Relative Properties
     1. Conductivity
     2. Weight
     3. Cost
D. Conductor Insulation
     1. Film
     2. Wrap
     3. Combinations

Size Relationship

A. Frequency
B. Temperature Class
C. Regulation
D. Voltage Level
E. Construction

Design Calculations

A. Size
     1. Power Rating
     2. Turns
     3. Wire Size
B. Coil Design
     1. Coil Length
     2. Winding Length
     3. Turns per Layer
     4. Number of Layers
     5. Winding Build
     6. Mean Turn
     7. Wire Length
     8. D.C. Resistance
     9. Wire Weight
C. Core Characteristics
     1. Core Weight
     2. Core Losses
         a. Watts
         b. Excitation
(Apparent Losses) VA
D. Transformer Characteristics
     1. Conductor Losses
         a. Resistive Losses
         b. Eddy Losses
         c. Total Conductor Losses
     2. Voltage Regulation
         a. No-Load Voltage
         b. Percent Regulation
     3. Efficiency
     4. Temperature Rise
E. Convection and Radiation
F. Transformer Cooling Surfaces

Effects of Coil Cooling Ducts

A. Effects on Temperature Rise
B. Effects on Impedance