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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

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

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

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

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....

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

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

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

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

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

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,

Thank You for Your Support!

Big Changes are Coming Soon 2015 was an incredible year for Valence Electrical Training Services. We: Sold over 5,000 copies of The Relay Testing Handbook to date Trained over 150 students in our hands-on

Portable Phase Angle Meter from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #16 This excerpt from the 1924 version of Silent Sentinels discusses how engineers used a phase angle meter in the early days of the electrical system. What differences

Save Your Spot at the 33rd Annual Hands-On Relay School

The Hands-on Relay School in Pullman, WA is probably the best environment for relay training there is. I highly recommend that everyone attend. Sign up as soon as you can because they sell out quickly. Here’s

Instrument Transformers from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #17 This excerpt from the 1924 version of Silent Sentinels discusses how engineers applied instrument transformers in the early days of the electrical system. What differences

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