Transformer School

This three-phase course will start with the basics of transformers, including turns ratios, polarities, calculations, connections, and troubleshooting.

Participants will learn about the basic three-phase systems and the relationship of the phasor to the transformer itself.

In the hands-on portion of the course, participants will work with miniature transformers that are energized and will blow fuses in order to experience what happens when something is wired incorrectly.

The class will continue to build on the miniature transformer banks and work on troubleshooting. Additionally, they will discuss motor rotation as it relates to three-phase systems, as well as ways to prevent voltage surge when switching a three-phase bank.

The Transformer School held annually at the MMUA Training Center in Marshall. To learn more about the program and the topics covered, click on the event brochure.

Date: 

December 15-18, 2025

Location: 

MMUA Training Center
1004 Michigan Rd
Marshall, MN 56258

This school can benefit anyone who works in a substation environment or those interested in learning more.

Upon completion of the three-phase transformer connections class, participants should have a good understanding of the following topics, related to transformers:

• Basic three-phase connections
• Delta connection
• Wye connection
• Open delta connection
• Three-phase troubleshooting