Understanding Line Distance protection (21)

End-to-end testing can appear to be a daunting task. However, any relay tester can perform successful end-to-end tests with a basic a basic understanding of transmission line protection (or 21 impedance protection) along and some preparation before the testing is scheduled to begin.
The second video in our end-to-end testing series continues our introduction to transmission line protection (also called impedance protection, 21-element protection, or line distance protection). We perform a series of end-to-end tests on a normal transmission line with standard line distance protection and compare the results to a POTT scheme to see how standard distance protection is different than communication-assisted tripping schemes.
You can play with these animations at our website relaytraining.com/. Each of the most commonly applied protection schemes have their own animations and they can be found at relaytraining.com/tag/end-to-e....
The standard line distance animation can be found at relaytraining.com/distance-pro....
The POTT scheme animation can be found at relaytraining.com/pott-animation/.
This video expands on the descriptions found in The Relay Testing Handbook: Principles and Practice, Testing Line Distance Protective Relays (21), and End-to-End Testing. You can order any of these books in print or as digital pdf downloads at our store (relaytraining.com/product-cate....

[@israel_theengineer]

shortest explanation i ever heard, thank you!!!!

[@jayschumacher815]

Thank you for all the hard work making these videos available to the public. It is much appreciated.

[@suryanath8464]

The best lectures I saw on Distance protection...

[@fredr4258]

So far so good. Vids 1 & 2 seem very good. I've picked up a few things. Thanks for creating these vids and sharing them!

[@mt.penguinmonster4144]

This is a high-quality explanation

[@juanpcie]

Excelente explicación de la función 21. gracias por el video.

[@dianacruise40]

Fantastic. Thank you so much for this video.

[@sailorneptune50]

one of the best description of this topic

[@paulohenriquebarbosa7479]

These materials will certainly help me on doing my job.

[@juliofh5623]

Thanks for uploading this video. Nice and clear, great job.

[@TrungNguyen-kp7pv]

Plz make more the videos like this, i love it! Thank you

[@melitongojo4992]

Very clear explanation! Thanks. At last, now I understood them.

[@rezashah91]

full detail and thorough description, thank you...

[@greasyfingerss9811]

Epic video, really intuitive! keep the excellent work!

[@prasanthlaksumanan1281]

It's very clear and understanding for everyone 🙏

[@gregoryhinshaw701]

Good explanation of POTT Schemes.

[@ayushshringi6993]

Very precise and great use of graphics. Thanks for uploading.

[@NatrajTNatarajant]

VERY NICE AND CLEAR EXPLANATIONS

[@AhmedKhaled-im1xs]

Deep Informative .. Simple Explanation .. Thanks For Sharing .. Keep Going

[@ZahidHussain-wk1zl]

Great explanation... Very easy to understand...