How Buchholz Relays Work

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This 3D animation shows how a Buchholz relay works. The 3D animation explains clearly each of the three main faults a transformer is likely to have and how the Buchholz relay triggers either an alarm and/or shutdown depending upon the severity of the fault.

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▶️Introduction
We discuss the Buchholz relay’s main components and how they protect the electrical transformer. Compared to gas actuated relays, a Buchholz relay has three functions, but a gas actuated relay has only two.

Buchholz relays are only fitted on liquid insulated electrical transformers and are designed to operate with the following electrical faults:

Fault 1
Large Electrical Fault
Fast and Large Amount of Gas Accumulation
Result: Transformer Alarms and Trips (shutdown)

Fault 2
Minor Electrical Fault
Slow Gas Accumulation
Result: Transformer Alarms

Fault 3
Low Insulating Liquid Level
Insulating Liquid Level Drops
Result: Transformer Alarms and Trips

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[savree-d]

Want to continue learning about engineering with videos like this one? Then visit:

Want to teach/instruct with the 3D models shown in this video? Then visit:

[fsimz]

The explanation is clear, and the 3D animations are beautiful! This channel is a gold mine. Thank you so much. Please do more EE videos.

[JFPizarro]

The best explanation of bucholz relays on youtube. Congratulations!

[BeyondDuctTapeFixItRight]

Terrific video! @6:28 audio calls out the lower float dropping when it's the upper one that is dropping.

[bothayonela]

very clear explanation with animations

[JimFly]

Great video, do you by chance have one of these good videos for Sudden Pressure devices, not of the buchholtz type but for the Nitrogen space or Oil, ?

[xavive]

Excelent simulation and explanation, thanks

[CHLEOMENTETV]

Best explanation I have watch.. Congrats sir..nice one!

[Luzt.]

Baffle plate works with liquid whose movement is created by displacement by large/quick pocket of gas in the main tank. You should also give more information regarding internal workings before presenting scenarios. Lower contacts, as far as I noticed, were never mentioned. Thank you.

[arumugarajapalraj]

Hi Sir,
Thanks for video
Could you please share Dry type transformer Annual maintenance and what kind of tests need to taken

[tylerminix]

I'm interested in the difference between the Buchholtz relay and other forms of sudden pressure relays. Is there no other difference (in principle) apart from where the two are installed?

[TheadorJohnson]

Well done thank you for the detailed info about components.

[MrNatReal]

Thank you for taking your time to make this video; you explained it well, and I found it helpful. You said nothing about a mercury switch. Is this what you meant by the contact?

[gilbertotorres]

Does the transformer manufacturer provide the bucholtz for the transformer? If I have to choose a bucholtz relay myself for let’s say a 100 MVA what are the most important parameters when selecting one?

[omotayoopanubi]

This is amazing. Thank you for this explanation

[nicholasdevoy]

Hi there, great video! It really helped me out a lot. One thing I don’t understand is how the bottom float drops when level is low without the gas. Apologies if I have missed it in the video but just can’t get my head around that bit, thanks in advance :)

[AlonsoLioneth]

Does gas gets analyzed too or just oil? is DGA applied to both samples?

[nagypeter]

Not bad... not bad... BUT!
You should show each animations a few times, as it was a loop. It would be useful to see the processes from more angles, with different zooms.
It would be very helpful to see the gas flowing if it had a color.
You should have mentioned the mercury switches and their output signals on the top of the Buchholz!

[rjshtk]

Would you care to tell me why there are two bleed valves on top of the Buchholz relay's chamber? Even though one of the valves does nt exactly look like a release valve..

[christopherhulse]

Buchholz relays fitted to electric locomotives as well.