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36th Annual Hands-On Relay School

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

2019 Hands-On Relay School

The 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

How to Test Protective Relays Correctly

Usually 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

Use Sequence Components To Make Sure Your Relay Isn’t Disabled By Incorrect Phase Rotation

Did 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?

Understanding Permissive Over-Reaching Transfer Trip (POTT) Communication Assisted Trip Schemes Video

Here 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

How to Perform an In-Service Protective Relay Meter Test

In-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

A New Power Line Carrier Book is Now Available at www.plcexperts.net

Jeffrey 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

2018 Hands-On Relay School Enrollment Now Open

Want 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

How to Perform Dynamic Relay Testing on Digital Relays

If 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

Why Does My Open-Delta Connected Phasor Diagram Look Weird?

Meter 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

Why Do Traditional Line Distance Protection Relay Testing Procedures FAIL on Digital Relays?

Traditional 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,

Overcurrent Relay Testing Online Seminar – Under Construction

We 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

Coming Soon! The Relay Testing Handbook: Simplified Motor Protection Relay Testing

Start 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

How to Understand and Determine Phase Rotation in a Power System

Understanding 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

Understanding Permissive Under-Reaching Transfer Trip (PUTT) Communication Assisted Trip Schemes Video

Here 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