I’ll be presenting the “Testing breaker Failure Schemes” open lecture at the 36th Annual Hands-On Relay School this year. I haven’t written anything about Breaker Failure protection
Continue readingThe Hands-On Relay School in Pullman, WA is one of the best relay training opportunities there is. It will be held at Washington State University between March 10-15, 2019. Registration opens on November
Continue readingUsually I try to keep my posts as simple and practical as possible. This post is a little different because I will discuss how I approach all relay testing. Skip this one if you are looking for relay
Continue readingDid you know that a relay connected to, or set with, the incorrect phase rotation can disable its higher level functions? Did you know that the wrong phase rotation can make your relay testing worthless?
Continue readingHere is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the
Continue readingIn-service protective relay meter tests are THE MOST important tests that should be performed on every digital relay. All of your offline relay testing is meaningless if: The CT/PT ratios are incorrect. The
Continue readingJeffrey Brown reached out to help announce his new book, Power Line Carriers – Simplified: A Field Engineer’s Perspective I don’t know much about power line carrier. I’ve only
Continue readingWant to get the best relay training possible? Sign up for the 35th annual Hands-On Relay School in Pullman, Washington happening March 12-16, 2018. They fill up fast, so you should sign up today! https://cm.wsu.edu/ehome/index.php?eventid=268868& This
Continue readingIf you’ve read anything about relay testing written in the last ten years or so, you’ll see a pattern; No-one is talking about the traditional pickup and timing tests most relay testers (and
Continue readingMeter tests on protected relays connected to open-delta connected PTs can be very confusing. I know I spent a LOT of time trying to figure out the values reported by my first open-delta connected relay
Continue readingTraditional line distance relay testing procedures (MTA, Reach, and Timing) are a great way to test electro-mechanical relays and learn how line impedance relays operate; but they are inefficient, ineffective,
Continue readingWe need your help with our next online seminar about overcurrent relay testing. What would you like to see in an online seminar about overcurrent relays? Our current rough outline includes: Why Do We
Continue readingStart by understanding the general operating characteristics of motors and their control schemes. Review the documentation to make sure everything is designed to operate correctly. Connect your test-set
Continue readingUnderstanding phase rotation is vital when connecting two systems together because the results can be catastrophic if someone doesn’t understand how to interpret phase rotation drawings. You would think
Continue readingHere is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the
Continue reading