This question was submitted via the Ask Chris form where you can ask me relay testing questions that I can hopefully answer. Creating test plans for digital relays is often difficult because you can have ten relays with identical model numbers that have completely different functionality. Conversely, ten induction disc relays of
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 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
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
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