Here is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the Can You Predict What Happens in a Permissive Over-Reaching Transfer Trip (POTT) Scheme? post found under the Testing handbooks / Book Extras
Traditional line distance relay testing procedures (MTA, Reach, and Timing) are a great way to test electro-mechanical relays and learn how line impedance relays operate; but they are inefficient, ineffective, and frustrating when applied to modern digital relays. This post will show you why your traditional tests are probably failing,
Here is the latest video describing the Permissive Under-Reaching Transfer Trip Communication-Assisted Trip Schemes used in modern distance protection. You can follow along with this animation via the Can You Predict What Happens in a Permissive Under-Reaching Transfer Trip (PUTT) Scheme? post found under the Testing handbooks / Book Extras
We’re continuing our end-to-end testing series by looking at the two simplest communication-assisted trip schemes used. Watch this Direct Transfer Trip and Direct Under-Reaching Transfer Trip Schemes Video to learn more about these two schemes. You can read the transcript below the video. If you haven’t watched Understanding Line Distance protection (21),
Rahim submitted this question to the Ask Chris section of the RelayTraining.com website. Most line distance protection schemes assume that the system will always be able to supply enough amps to make the relays trip. However, there are many scenarios on transmission systems across the world where you could have
The last video in our end-to-end testing series gave you a general overview of distance protection, and why we use it in modern electrical systems. It is important to know how a regular distance protection (21) scheme will react to different faults around the relays, and how those reactions are different from communication-assisted
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