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
We just got the word from InterNational Electrical Testing Association that our two newest courses (Introduction to Modern Relay Protection Testing hands-on training class and Course 1-1: The Three-Phase Power System online training course) are now eligible for NETA Continuing Technical Development Credits (CTDs). This means that all NETA members can earn NETA Continuing
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
The Relay Testing Handbook: End-to-End Testing covers the most common Communication-Assisted Protection Schemes including the Directional Comparison Blocking (DCB) Scheme. This bonus animation shows the steps involved for a DCB trip. End-to-end testers should understand how this scheme operates before they test it and this animation was created to help relay
The Relay Testing Handbook: End-to-End Testing covers the most common Communication-Assisted Protection Schemes including the Permissive Under-Reaching Transfer Trip (PUTT) Scheme. This bonus animation shows the steps involved for a PUTT trip. End-to-end testers should understand how this scheme operates before they test it and this animation was created to help relay
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