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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
Continue readingPortable 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
Continue readingSave 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
Continue readingInstrument 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
Continue readingAuxiliary 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
Continue readingTemperature 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
Continue readingDirect-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.
Continue readingWestinghouse 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.
Continue readingTypical 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
Continue readingRelay 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
Continue readingGet 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
Continue readingThe 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
Continue readingWhat 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
Continue readingAutomatic 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
Continue readingDrawing 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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