Local Breaker Backup (LBB) / Breaker Failure Relay (BFR) - Part 1 - Concept, Importance and Working
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- čas přidán 20. 08. 2024
- For Theory on LBB Protection Visit electricalfund...
In Part I , we wil be discussing , Concep, Importance and working of LBB/BFR relay.
In Part II, which will be coming later, we be discussing actual Scheme of LBB which is being used in a Substation and also the settings of the LBB Relay. We will post the link to the video here.
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Before I can't explain any circuit but sir after watching ur all video I have full confident to explain any circuit.thanks alot
Ek dam jhakasssss hy video
Sir ji
Very good speech
Nice sir
Ultimate video sir.thanku for this explanation in a very simple language
I'm new in 400kV switchyard at generating end & your video is really helpful to me...Thanks a lot
Thank you sir, for keeping us inspired !
Good description
👍👍
Good video, thank you
Thanks for u r explanation bro...really helpful...
Very clear and crystal👍🏻
Thank you. Please join our Fb Group nitinn.link/elecfbgrpeffbpg
Very good. Thanks
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Very nice explain and informative video's keep it up.
Thank you
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Sir first off all i would like to say that your videos are really amazing,the way you explain things is impeccable.Thanks for all these videos.
Also, my doubt in this video is what happens during the reclosing? This time 200 ms includes the reclosing time also?what if the multi shot reclosing is taking place and breaker gets stuck?
Sir, very good explanation.
Please show practical videos also.
Where these r placed in panels
Thanks.superb explanation. Pl keep up
Thanks sir🙏
Thank you sir, for keeping us inspired !
Nice
Very nice video
You have mentioned three conditions to be satisfied for LBB initiation such as:
1. 86 relay to be picked
2. LBB timer timed up and
3. presence of current..
Note that all the above three conditions are not ANDed for LBB initiation.
For LBB initiation, the relay will check mainly two things:
1. 86 picked or not, LBB Timer's 200ms is over and CB open status not obtained from all 3 poles, current still persists any of the poles. (Here, any of CB poles actually has not opened)
2. 86 picked or not, LBB timer's 200 ms is over and CB open status obtained from all 3 poles, but current still persists in any of the CT secondary. (Here, Aux contacts changed to open CB position, even though any of the CB pole actually has not opened)
If any of the above two conditions are true, the relay will close an NO contact which you can wire to trip the source CBs to stop the possible feeding to fault.
Make sure that the LBB timer is fed from an NO contact of a relay that supports the LBB function, so that whenever a trip is initiated by the relay, it starts the LBB timer and gives the pulse to energize the 86, simultaneously. This way, a non functioning 86 relay coil will result in the LBB initiation too.
LBB Stage 1 initiation and stage 2 initiation:
Stage 1: It initiates trip to the same CB it monitors for failure as a stage 1 action.
Stage 2: It initiates trip to the upstream CB/CBs for failure of stage 1 action.
Thanks so much sir for giving this valuable information. May I know the source of the information please.
Word of mouth from my seniors at work. Feel free to correct me if I am wrong please.
@@ELECTRICALFUNDAZ LBB Stage 1 initiation and stage 2 initiation:
Stage 1: It initiates trip to the same CB it monitors for failure as a stage 1 action.
Stage 2: It initiates trip to the upstream CB/CBs for failure of stage 1 action.
Make sure that the LBB timer is fed from an NO contact of a relay that supports the LBB function, so that whenever a trip is initiated by the relay, it starts the LBB timer and gives the pulse to energize the 86, simultaneously. This way, a non functioning 86 relay coil will result in the LBB initiation too.
I have a few questions by a client. Please check them and let me know you can answer them or correct them. Please ping me on wassup 9920940557.
Nice video sir
Plz upload part 2
Kindly make video regarding Breaker & half 400kV Busbar protection system, Thank You
Sir 2nd part jaldi upload kijiye.
yes sir we r working on it.
@@ELECTRICALFUNDAZ
Sir mujhe usme doubt hai.aapki video se bahut kuch sikha C.B ke bare me.
@@abdulhalimsiddiqui4964 Thank You Sir, we will work on it.
These days modification done.. LBB gives retrip command at 100ms to faulty breaker and then at 200ms it will trip busbar of fault is not cleared..
Yes sir, in Part 2 we will try to cover about the Internal or the Numerical LBB as well. If you have any theory or training material on the same please pass onto nitinnarvekar9@gmail.com.
@@ELECTRICALFUNDAZ sorry as of know I don't have any but if any available I will definitely share to your I'd..We are waiting for your Part 2 video eagerly it's already 6 months
Thanks guru
very good....what is meaning of local and remote breaker??
Breaker of the local end substation is called Local end breaker and that of remote end substation is called remote end breaker.
one and half switch yard kya Advanced & Disadavanced in hindi
Thanks for encouraging us. We will work on your comments!!
Advantages:
1. In case fault occurs in any bus, only fault associated Circuit Breakers get tripped & other Circuit Breakers are not interrupted & hence no interruption to the feeders.
2. If any one of the Circuit breaker is out of service in one dia/bay, u can isolate it & make service/overhauling respective breker without interruption
Disadvantages:
1. Complexity in metering & protection
Sir please uplaod part 2 of this topic..
Please sir make second video on LBB..
Please send the link for second episode.
We are working on it.
where is the part -2 of this video?
Sir LBB operation i have facing in 220 kv its very complex and scary situtation
No problem sir we will make it easy.
Sir kya problem hai.plz iska part2 upload kijiye
2nd video of lbb?
👏🏼👏🏼👏🏼
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Sir Very good Explanation. Sir if both 86A & 86B relay fails to send trip command then in this case LBB protection will operate or not?
If 86 A/B fails to operate....there will be no initiation for LBB and fault will be cleared in zone 2 from remote end.
@@ELECTRICALFUNDAZ Okay Sir Ji Thank You .
Part 2 kahan hai
Sir Please do in English language also
Yes sir , we r working on electrical channel which is in English.
SIR ABB SCADA 765/400 KV AIS KO KAISE OPERATION KAISE KARE
Boss this LBB scheme used in individual sub station like for one industry 33kv/440v or only in transmission line.
It can be used for 33 kv as well.
Provided there Busbar protection.
I m talking about distance Protection relay
ok sir
please, Vcb all relay control wring make video with daigram.
czcams.com/play/PLlBI8bisRsHgAbdm3YP6jQ43UDipr3E1O.html
could we a translated version in English?
thank you
Jacob oketcho. Uganda.
Sir plz Make video on ,DPR
If you're talking about PDR relay , we are working on it.
Bro if the breaker stuck then how the lbb can trip(open) that breaker
Bro in LBB scheme if fault doesn't clear or tripped by own breaker then LBB operates to trip all breaker on that BUS with Bus coupler breaker.
2 video of LBB protection ????
Yes sir
When ???
Where is the part 2
In process
Does lbb take the status of bkr open/close status to operate.or only fault current
Breaker Status not considered, only Fault current is considered.
@@ELECTRICALFUNDAZ Thanks.
Thank You.
Why the fault will go from local to remote substation??cant d.o. fuse of local substation blow off??
This video is about the LBB Scheme, which is used at 220 KV Level Subsattions.
Very good explanation sir.
Why two master relays 86A and 86B are used normally in substation???
Protection Relays are grouped into Main and Backup Protections. Those Relays Grouped under Main Protection, operate 86A and those under Backup Protection Operate 86B. This done to provide redundancy. Also , 86A is given DC Source A and 86B is given DC Source B.
@@ELECTRICALFUNDAZ It means there are only two gateways through which concerned breaker can be instructed to open remotely. So no matter from where ever the trip commond is coming, it has to pass through either 86A or 86B. If trip commond is from main protection it will pass through 86A and if it is actuated by back-up protection it will pass through 86B.
Am i right??? Please give your thoughts.
@@chhaiyanathu Yes absolutely, right. Breaker will operate, only when 86 Operates. Also, one of the reasons for LBB operation, is that the Failure of the 86 Relay to issue Trip command to the Breaker.
@@ELECTRICALFUNDAZ When LBB initiates BB protection then through which relay(86A or 86B) trip commond to all concerned CBs will be extended???
No No No. If the 86 Relay is operated and the Breaker does not Trip for 200 ms and the Fult current as sensed by LBB Relay is more than 0.8A, LBB Relay sends a command to Busbar Relay and the Busbar Relay Trips all the Feeders on the Concerned Bus. LBB Relay is a smart fellow, he uses the Circuit of Busbar Relay.
Sir please make a video also in English
Ok sir.
Sir really after watch your video I am feeling that I am working in field.thanks alot.I am your big fans.also I am requesting with you can I get one chance to work with you sir.can u provide ur no.I want to talk with u.plz...............sir reply me.