Silent Sentinels 1924 Excerpt #2 This excerpt from the 1924 version of Silent Sentinels discusses how electrical engineers were applying relays to circuit-breakers in 1924. This is the 2nd in the series. Follow these links to learn more about this series and the 1924 version of Silent Sentinels. 1 – Alternating-Current Circuit-Breakers
I remember randomly picking up an excellent protective relay book off a relay technician’s bookshelf when I first started relay testing in the 1990s. The book was old (written in the age of electro-mechanical relays), but it gave excellent descriptions of what the relays were looking for. Those descriptions stuck
In the previous post about Directional Overcurrent relay (67) testing (Finding the Direction in Directional Overcurrent Relays), we reviewed Directional Overcurrent protection from a system perspective to enhance the descriptions in The Relay Testing Handbook: Principles and Practice. We’ll be looking at Directional Overcurrent relays from a testing perspective in
A reader submitted a question through the Ask Chris form. I’ve expanded the original question from “what are the differences between relays, contactors and motor starters?” to “What is the difference between contactors, motor starters, relays and circuit breakers?” We’ll look at the history of electrical protection in this post
A reader recently asked a question about the forward and reverse directions described in the Directional Overcurrent Relay section of The Relay Testing Handbook series. I used electro-mechanical directional relays as an example, which may have been a mistake. Let’s take another look at the Directional Overcurrent (67) element from a
All high voltage electrical testers should understand the basics of electrical theory. Unfortunately, Many people in the high voltage electrical testing industry fall into testing by accident and never get good training material on electrical theory basics. They know how to use the equipment to test that relay, transformer, motor, etc., but never
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