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 fourth YouTube video, Understanding Microprocessor Relay Logic – Microprocessor Relay Testing Plans. (http://youtu.be/ijdSKozctNo) This video discusses how to turn the microprocessor relay testing logic into microprocessor relay testing test plans. This video series is a re-creation of the first paper I ever presented from the NETA conference in 2001 that was
We have uploaded our third YouTube video, Understanding Microprocessor Relay Logic – Relay Digital Logic Schemes. (http://youtu.be/do3EkEcb0eM) This video discusses the different relay digital logic schemes that are available from the most commonly used manufacturers. This video series is a re-creation of the first paper I ever presented from the NETA conference in
We have uploaded our second YouTube video, Understanding Microprocessor Relay Logic – Basic Digital Logic. (http://youtu.be/DEN-ZEtEZ5c) This video discusses how you can convert the digital relay logic found in microprocessor based relays and translate that logic into electrical schematics or other logic schemes. This video series is a re-creation of the first paper
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
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