Transmission Line 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 first video in our end-to-end testing series starts with an introduction to transmission line protection (also called impedance protection, 21-element protection, or line distance protection). A good understanding of basic line protection will go a long way towards understanding the different communication-assisted schemes typically used when end-to-end testing is performed.
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....

[@fredr4258]

I like how this puts things in easy to understand terms. Well done video and good illustrations.

[@ovaisraza9810]

Its quite helpful. I have been reading about distance protection for last 3 days but was confused, this video really helped me.

[@vadymgitman1983]

This is the very good and clear video for explanation of the distance protection relays. I will recommend it for a young people starting to study this theme.

[@mt.penguinmonster4144]

This is a very high-quality explanation.

[@renemontes7113]

Chris, I find that these videos are really help out. Please keep me posted on more transmission protection.

[@Relaytraining]

+Rene Montes Thanks Rene. There will be more videos in 2016. We're trying to get the next online training course out the door right now.

[@ahmadrezaabazari3089]

This record was really interesting and useful. I really enjoy watching it. I really thank you for preparing such a video.

[@electriciandallastx9182]

Thanks for the suggestions you have provided here.

[@gilsandrogomez]

Wow. This video is really good. Your explanation is so clear.

[@ARKTTCStaff]

Nice job, Chris! I'm looking forward to seeing more videos! - Todd Patterson

[@Relaytraining]

Thanks Todd. I just received the first draft of the next video today, so it should be released in January.

[@irangaM]

Thank you very much for the great work.

[@dovendrakumarverma3085]

Great Explanation... Really interesting and appreciating.

[@AhmedKhaled-im1xs]

Thanks For Sharing .. Very Informative .. Simple Explaination

[@shubhamsethi3530]

Dear Sir, The playlist is really amazing and it helped a lot in understanding the distance protection and end to end testing from scratch. There is request, if you can provide the same presentation then it would be really helpful.

[@swammi01]

Great Video. The animations and graphics get someof the more complex principles across far better than any powerpoint....including ours.

[@rahj1365]

Very well Done!!

[@SF-fb6lv]

Super good! Thanks!

[@tonijon4465]

Perfect explanation....

[@gibbzydube]

please add more videos very informative and easy to follow, bought the books but this video tutorial is easy to understand

[@CillBinton]

thx, this was very helpful

[@saunakbhalsod3076]

Its Amazing keep posting more videos. You cleared many doubts

[@Relaytraining]

Thanks. We're working on the next one in the series now and it should be posted in December.

[@harithakandula6172]

Thank you for sharing

[@ovaisraza9810]

Thanks for sharing

[@mahdibayat1967]

thanks, very useful

[@vaibhavman]

thank you.....

[@seifeddineotmane9842]

thank you, great work it helps me so much, would you please make another video about the transformer and generator protection

[@Relaytraining]

Thanks. Those videos will come, but there's a lot more in the queue in front of them

[@ningningrum4724]

The video sound is pretty good, beyond my imagination

[@kanakapudiajaybabu8321]

Thanks 👍

[@bhimamaher185]

perfect for me

[@ExplorerRaza]

Really good video sir

[@tomastomas2851]

good work

[@abhishek894]

Great video. It cleared my doubt about the zones. Can you please explain which relay will cover a fault in the part between the bus and the CT first?

[@Relaytraining]

That area should be protected by a bus differential relay.

[@luabd1010]

Good explaining Just It’s better to explain protection parameters at any distance relay like seimens

[@prodigymaestro8310]

can you provide a similar video on unsynchronized two terminal fault location estimation. PS great video!

[@Relaytraining]

+Nimmi Regmi Thanks. We'll put your suggestion on the list.

[@lachkeoelectric256]

yes thanks you

[@kajalmadaam9638]

Thanks..

[@baskpatheee]

what is the difference between standby and sensitive earth fault protection?

[@baskpatheee]

what is the difference between swwitched and non switched distance protection?

[@legendarygamerprince5317]

Nice video sir 🙏from SAP

[@95artii]

how do you know that the relay will detect the short circuit current as 8 A and voltage is 40 V at the 50% of the transmission line?

[@Relaytraining]

Suharti Hajar Impedance protection works for any voltage and current with a ratio less than the reach setting. That's one of the reasons we use distance protection. Any voltage/current ratio that equals 5 Ohms would be a fault 50% down the line

[@Relaytraining]

+Gautham Ashokkumar It could be 50/10 = 5 Ohms, but I already used 50V for a fault at the end of the line. The fault voltage will get smaller as it gets closer to the relay PTs, so a fault 50% down the line would be smaller that 50V. I randomly picked 40V. In the real-world, the amount of voltage drop would be dependent on the line impedance, fault impedance, source impedance, and strength of the sources.

[@sambhashiwas2892]

thanku sir , can you plese provide the link for CB Auto reclose function

[@Relaytraining]

Thanks. I'll put it on the list for a potential blog post in the future.

[@khaliljaved3113]

transmission lines differential protection using wireless plz

[@pravinnitb9726]

i dont understand at time 7.08 min they said that at last 30 % of line1 if fault occurs adjacent relay operate first.why this ? adjacent relay is not issue na main issue is to protect genrator side (substation side). first relay 1 has to operatr?

[@mebinpunalur]

Could you do a video on how the logics are done in Distance protection numerical relays.. Say Autoreclosure logic especially for a one and half breaker scheme and all the other logics

[@Relaytraining]

Thanks for the suggestion. It's a good idea and we'll put your suggestion on the list of future ideas.

[@caloyceloy622]

Please post more videos. Thanks

[@Relaytraining]

More videos will be coming.

[@gamingworldofAbdullah_8787]

👍

[@rajeevjaiswal2075]

How can I attend online class for relay testing

[@Relaytraining]

relaytraining.com/online-protective-relay-training-v3/

[@kallyanpurgridsubstation9600]

What do you mean by doted line?

[@Relaytraining]

The dotted lines on the video

[@livebudy]

I need details for training courses

[@Relaytraining]

Priyanka Pande We cover this topic in our Advanced Protective Relay Testing Training Courses at relaytraining.com/product/advanced-protective-relay-testing-training-courses/

[@sanju0039]

Where the Zone-3 will come?

[@Relaytraining]

It depends on the owner/operator. Some Zone 3s are large forward-looking zones with long time delays (60-90 cy), some are reverse-looking zones with long time delays, some look in the reverse direction and share information about the fault with another relay.

[@anessnada7295]

est ce que se trouve des documentations en français svp

[@joeldjiogo7888]

salut Aness Nada, je ne pense pas qu'ils ont deja fait des traductions en Francais a ce sujet. Quand jai pris ce cours en ligne dans leur website c'etait en Anglais.

[@praveenkumar-gn6sd]

I am an Indian graduated in electrical and electronics engineering , in india thare is no carrier options i would like to move to usa , how can I get a job thare

[@diegogalvis4931]

Hey there, do you have subs? I read better than listen. Thanks

[@Relaytraining]

I uploaded the text with the video that should be visible by clicking the cc button

[@asmaehicham7192]

Valence Electrical Training Services Great a job :D but , do you have a subs in french Pllz ! I have to undrestand all things in this video but it's very hard in english , thank you .

[@Relaytraining]

We have no plans for french CC. Sorry.

[@asmaehicham7192]

Okay , Thank you

[@Relaytraining]

Asmae Hicham This post has the full text relaytraining.com/understanding-distance-protection-21-video/, so you could run a google translate on that, if that helps.