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

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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

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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

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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

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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

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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

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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,

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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

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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

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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

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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

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Help with 27/47/59N Protection in an SEL-387E

A reader has requested some help for an upcoming project: I will be reviewing some relay testing that needs to performed shortly and I am trying to understand how the 27/47/59N (within a SEL 387E) relay

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How to Measure Phase Angles with a Phase Angle Meter

I’ve noticed that many students don’t seem to have experience with phase angle meters, and they can’t guess what a phase angle meter would measure in simple circuit. This knowledge is CRITICAL if

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Valence will be at the 34th Annual Hands-On Relay School

Chris will be at the 34th Annual Hands-On Relay School this year. Stop by the Suppliers Showcase on Tuesday evening to meet the author of The Relay Testing Handbook Series, or check out our collection

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How To Communicate with a Test-Set or Relay

Sometimes the hardest part of relay testing is getting your laptop to talk to the relay or test-set. There are two primary communication methods: Serial Connections Serial communication is the most

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