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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

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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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Auxiliary Relays from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #15 This excerpt from the 1924 version of Silent Sentinels discusses the most common auxiliary relays used in the early days of electrical systems. This is the 15th in the

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Temperature Relays from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #14 This excerpt from the 1924 version of Silent Sentinels discusses the most common temperature relays used in the early days of electrical systems. This is the 14th in

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Direct-Current Relays from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #13 This excerpt from the 1924 version of Silent Sentinels discusses the direct-current relays used in the early days of electrical systems. This is the 13th in the series.

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Westinghouse Protective and Control Relays from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #12 This excerpt from the 1924 version of Silent Sentinels lists the protective and control relays used in the early days of electrical systems. This is the 12th in the series.

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Typical Relay Application from Silent Sentinels 1924

Silent Sentinels 1924 Excerpt #11 This excerpt from the 1924 version of Silent Sentinels discusses typical relay applications used in the early days of electrical systems. Are they much different than

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Relay Settings from 1924 Silent Sentinels

Silent Sentinels 1924 Excerpt #10 This excerpt from the 1924 version of Silent Sentinels discusses protective relay settings in the electrical system. This is the 10th in the series. Follow these links

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Get NETA CTDs for All of Our Online Courses

The InterNational Electrical Testing Association (NETA at http://www.netaworld.org/) just informed us that our latest online training course, Drawing Phasor Diagrams for Relay Testers, has been approved

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The Relay Testing Handbook Updates

Our publishing model allows us to quickly correct errors or omissions and implement suggestions. Please contact us at [email protected] to report a problem. If we implement your suggestion, we’ll

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What is DC Offset? Ask Chris

I was recently asked about DC Offset during a paper I presented at the 2015 Hands-On Relay School and struggled with an answer because I know what it looks like and I know it exists, but I’ve never heard

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Automatic Control for Electrical Systems

Silent Sentinels 1924 Excerpt #9 This excerpt from the 1924 version of Silent Sentinels discusses automatic control in the electrical system. This is the 9th in the series. Follow these links to learn

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Drawing Phasor Diagrams for Relay Testers

Waveform diagrams contain every detail of an electrical system, but that information can be difficult to understand without a lot of effort. Phasor drawings take the complex information embedded in waveform

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We Need Your Help with Our Next Protective Relay Online Training Class: Electricity 101!

We’re wrapping up our upcoming protective relay online training class: Understanding and Drawing Phasor Diagrams, and we are ready to get started on the next course about the electrical fundamentals

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Direct-Current Systems from Silent Sentinels 1924

Silent Sentinels 1924 Excerpt #8 This excerpt from the 1924 version of Silent Sentinels discusses direct-current systems. This is the 8th in the series. Follow these links to learn more about this series

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