We added a new YouTube video, Why did my Frequency Test in Cycles Fail?. This video describes how two different relays with identical settings can have different time test results when performing any frequency test. Relays that use time delays in seconds are easy to test because seconds is a universal unit
We have uploaded our first YouTube video, Understanding Microprocessor Relay Logic – A Brief History of Relays. (http://youtu.be/q_E_Gv_9_LQ) This video talks about the history of microprocessor relays and why our test routines need to change as the protective relay technology changes. This video series is a re-creation of the first paper I
Here is another excellent, but dated, video that covers a lot more than its title. It starts with an excellent introduction to CTs and PTs (http://youtu.be/T5U5M3RYx9Q) Then some Phasor Diagram basics at 26:10 (http://youtu.be/T5U5M3RYx9Q?t=26m10s) Then it discusses transformer connections and one method for calculating phase shifts at 30:18 (http://youtu.be/T5U5M3RYx9Q?t=30m18s) It
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
Understanding how to perform electrical fault calculations is not necessary if your primary goal is to simply test relays. However, if you want to truly understand the electrical systems, how relays work, and why they do the things that they do; understanding electrical fault calculations is an excellent starting point. This video
Transformer vector groups can be a difficult concept to understand. I was lucky because the transformer ratio test-set I used for the first couple of years in my career allowed me to make three-phase connections, but it was really a single-phase tester and I had to change the connections one
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