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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Frequency Response and the Power System

Here’s an excellent video on frequency response in the grid from NERC. I often tell my students that renewables are making the power system less stable and this video explains part of the issue....

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What Was Your Electrical Epiphany?

The next generation of relay testers need your help! We’re almost finished our “How to Test Protective Relays” Online Seminar and we’re starting to write the next online training

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High Impedance Busbar Differential Protection

We covered the basic operating principles of high impedance busbar differential protection in our previous post, I Want to Know How a High Impedance Differential Scheme Works. You should read that post

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Get and Manage Protective Relaying Online Training Courses for Your Entire Team

Want to enroll your entire team in one of our protective relaying online training courses quickly and easily? With our new added features, you can: Purchase multiple seats in any of our online training

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I Want to Know How a High Impedance Differential Scheme Works

We received this question from the Ask Chris form at relaytraining.com. Follow this link to ask your own question and it might appear in a future blog post. High Impedance Differential Scheme Testing High

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Direct Transfer Trip and Direct Under-Reaching Transfer Trip Schemes Video

We’re continuing our end-to-end testing series by looking at the two simplest communication-assisted trip schemes used.  Watch this Direct Transfer Trip and Direct Under-Reaching Transfer Trip

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Valence will be at the NETA PowerTest 2016 Conference in Fort Worth, TN

The NETA PowerTest 2016 Conference is one of the best conferences in the industry. It starts on Monday, March 14th with a series of 45-minute lectures from industry experts. There are several tracks,

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Where Should We Hold the Next Hands-On Relay Testing Training Class?

We want to make protective relay training available to everyone who wants it, not just for for companies that can afford to bring our trainers to their locations. We found a classroom provider who allows

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A New Hands-On Protective Relay Testing Fundamentals Class has been Scheduled in Denver

Denver, CO – April 19-21, 2016 Get training from Chris Werstiuk, author of The Relay Testing Handbook Valence Electrical Training Services is hosting a Protective Relay Testing Fundamentals class at

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