Understanding PUTT Communication Assisted Protection Schemes

We're continuing our end-to-end testing series by looking at the Permissive Under-Reaching Transfer Trip communication-assisted trip schemed. You can read the transcript at relaytraining.com/understandi...
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-...
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....

[@raheemelsayed]

Thank you, very nice animations that helped me understanding these parts 3 months ago.

[@sherubwangdi8552]

thank you guys for such intuitive video. It was really helpful!!

[@leticia06408]

Thank you for this amazing explanation!

[@shakirjilani1424]

Very well explained

[@nishanthdmi]

Nice video..

[@Lyngaae]

I would love if you would compare POTT vs PUTT, cause I can't see the difference. Yes i understand that the PUTT only transfer a Z1 puckup, and POTT looks at Z2 pickup. But could you make an example where it would behave differently? Thank you.

[@Relaytraining]

The POTT Video at kzbin.info/www/bejne/rIe2dXhrbtt9osU shows an example of a POTT scheme failure that wouldn't have happened if a PUTT scheme was applied because the Under-reach transfer trip signal would never have been sent in the first place

[@tossapolpholthip4338]

@@Relaytraining is this mean we should choose PUTT over POTT? Is there any advantage of POTT over PUTT. Some one told me it is faster but I'm not quite understand because at the fault location we consider z1 and z2 pickup happen at the same time.

[@Relaytraining]

@@tossapolpholthip4338 I think so. The only argument I've ever heard for POTT over PUTT that made any sense was if you have a very weak source, and I've forgotten the part that makes sense as I write this.

[@Relaytraining]

@@tossapolpholthip4338 There is no difference in speed between POTT and PUTT at the same location with the same relays. The Zone 1 and Zone 2 math is the same inside the relay. All delays are caused by communication between devices, which would be the same regardless of POTT or PUTT.

[@tossapolpholthip4338]

@@Relaytraining when fault occurs the impedance Z will quickly decrease from load impedance to fault impedance in zone 1 and it should hit zone 2 barrier before it hit zone 1 hence z2 pickup should happen before z1 pickup/trip. I’m not so sure about above statement so I need second opinion. But if the impedance just jump to z1 then z1 and z2 should pickup at the same time.

[@user-om9ro7vw3e]

thanks sir which program for simulation

[@Relaytraining]

We had it custom made in articulate

[@lyapunovxxx5659]

Joia

[@seandavis480]

Lol