This should be an easy question… A-Phase is shown on this phasor diagram at 0 degrees. What angle would be used to describe B-Phase? Click here to see the correct answer There are three possible correct answers 120° -120° 240° The actual correct answer will depend on the equipment you
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
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),
Waveform diagrams contain every detail of an electrical system, but that information can be difficult to understand without a lot of effort. Phasor drawings take the complex information embedded in waveform drawings and convert it into phasor diagrams so that you can see the most important information about an electrical system at a glance. Understanding
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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