Valence Electrical Training Services

Understanding Microprocessor Relay Logic – Relay Digital Logic Schemes

We have uploaded our third YouTube videoUnderstanding Microprocessor Relay Logic – Relay Digital Logic Schemes. ( This video discusses the different relay digital logic schemes that are available from the most commonly used manufacturers.

This video series is a re-creation of the first paper I ever presented from the NETA conference in 2001 that was the foundation of The Relay Testing Handbook series.

The video describes the most basic relay digital logic schemes, including:

  • Individual Element (General Electric SR relay series or Beckwith Electric Co. relays)
  • Binary Control Schemes (Alstom or Siemens relays)
  • Matrix schemes (GEC Alsthom relays and Beckwith Electric relay element summaries)
  • Arithmetic or Math Schemes (Schweitzer Engineering Laboratories)
  • Logic Gates (General Electric UR series relays)

We’ve learned a lot about the YouTube format while creating this series and, unfortunately, it turns out converting PowerPoint to video is a little dry. Future video series will be much better.

We hope you found this video informative and hope you’ll stick with us as we get better with each series.


About the Author Chris Werstiuk

Chris is an Electrical Engineering Technologist, a Journeyman Power System Electrician, and a Professional Engineer. He is also the Author of The Relay Testing Handbook series and founder of Valence Electrical Training Services. You can find out more about Chris here.

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