What is inside a large 12.5 MVA transformer

RODALCO2007

Подписаться 79 тыс.

Просмотров 8 тыс.

50% 1

This Tolley 12.5 MVA TX was taken out of service after a Buchholtz trip was detected.
Gas analyses was done and further investigation is required.
No obvious defect was found at this stage.
Testing is still in progress and the transformer core is in the oven to keep the windings dry.
I created this video with the RU-vid Video Editor ( / editor )

Опубликовано:

20 окт 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 70

@Photonicinduction 8 лет назад

Lovely to see your video, I would not want to be the one to wire up the tap changer, bet all that oil smells sweet though :)

@RODALCO2007 8 лет назад

All cables are numbered, still awkward to do when the core is within the tank. The smell of the oil is delicious, as you know.

@johnnydavis8351 8 лет назад

wow. .that monster looks very intimidating. ....and you walk around it like a pro. ...very nice 👍👍👍👍👍👍

@Engineer9736 8 лет назад

Those spools around the big wires on top of the transformer, are they for measuring the voltage? They have a lot of turns..

@RODALCO2007 8 лет назад

That is a CT ( Current Transformer or Stroomtransformator ) to measure the current through the incoming supply cables.

@SigEpBlue 8 лет назад

Mmm, 12.5 MVA.... Just hearing that gives me a warm glow....

@evanpapp93 8 лет назад

They have a few of these at the scrap yard I occasionally go to and they are MUCH bigger in person

@agnichatian 8 лет назад

Pretty cool, thanks for the show-and-tell.

@MH-bv9kk 8 лет назад

If the fault is found and can be corrected, will this transformer be put back into service, or is the investigation more to keep from having issues with the replacement?

@jackking5567 8 лет назад

On the tapchanger - how do you know which wire goes back to which terminal? I can see 3 bunches which narrows it down but still - looks complicated! Also - when a tap changer moves to another winding, does it span two windings briefly so it doesn't interrupt supply?

@Engineer9736 8 лет назад

I think they just measure the resistance of the coil which has to match with precalculated values. Your second question is an interesting one; i was wondering the same!

@TheChipmunk2008 8 лет назад

2:45, Raymond mentions power resistors for when it goes inbetween two taps... my guess would be the brushes are connected to the resistors so the (relatively compared to 33,000v) small voltage difference between taps gets shorted thru the conveniently oil cooled resistors.

@mrclucker1969 8 лет назад

+TheChipmunk2008 If memory serves me right, you are correct. The tapchanger arm has two contacts designed to briefly span two tap positions during changing operation. The power goes through the resistor and this prevents arcing and spikes in the supply.

@RODALCO2007 8 лет назад

The wires are all numbered, also when assembled full winding ratio tests have to be done to confirm that all windings are connected correctly. This is done at low 110 Volts test voltages.Tapchanger goes from winding - to winding in parallel with R - then shifts quick to the next winding with R in parallel, and releases resistor.Often a flywheel in the mechanism will ensure a quick changeover.I have a video with the DS2 mechanical box somewhere, will upload when I find it.

@jackking5567 8 лет назад

Cheers! Tapchangers are something I was unaware of (but make perfect sense) until I'd viewed your channel. RU-vid is indeed educational :)

@bjtaudio 8 лет назад

Zone Transformer...What is a worry thou is not finding any problem with the insulation only to later say several months down the track put it back into service only to have it blow up..

@AEKarnes 8 лет назад

I see rails on the floor, are they for a railway carriage of some kind? This I take it is normally flooded in oil?

@johnnydavis8351 8 лет назад

I am curious. ....could you explain the gear box mechanism. ......very interesting.

@UmbreWolf 8 лет назад

What was the result of the gas test? Was it normal or do you not know? Not too familiar with the gas testing in the Bucholz relay except from what ive heard. Whats ive been told, if its flammable gas, then it could be a sign of overheating/arching. And if its not, could just be a slow oil leak. Ive heard that a few times from others who work on big transformers like this so maybe you should be the person to tell me how true that it or how such a gas test is done of that's not right.

@ProLogic-dr9vv 8 лет назад

Thank You I loved every second of that video.

@mrclucker1969 8 лет назад

It will be interesting to see what caused the gas. Quite often it can just be bad oil, but it can also be the start of insulation failure. But the windings looked quite clean and not discoloured, however the oil looked quite dark.

@RODALCO2007 8 лет назад

The TX failed shortly after a power surge on a 11kV feeder fault. The magnetic surge may have upset something internally.

@SeanBZA 8 лет назад

So, just how small a flashover does it take to blow enough oil into the conservator to trip it. I will guess that there was a tiny flaw in an inner winding that flashed over to another and then self cleared by blowing aluminium away and making a nice oxide layer there as well.

@RODALCO2007 8 лет назад

Yes, it is very likely that an internal flash over has done some arcing. Winding continuity tests have been done and the readings are good. The transformer won't go back into service at this stage and may even get scrapped. A 1953 ASEA transformer of the same rating will be installed in the meantime.

@rustblade5021 8 лет назад

could you maybe do a video on Buchholtz relay?

@travelinman70 8 лет назад

can you hook that up to your wasp zapper? It might send them to the 8th dimension. LOL

@Phil6219 8 лет назад

Fascinating, thanks for sharing

@redsquirrelftw 8 лет назад

Crazy to think of what must go into making these. I imagine it's not a high production item either, they might make like a few thousand unlike consumer products that are in the millions.

@metersocket00 8 лет назад

Is that whole cavity filled with transformer oil? 1000 gallon?

@RODALCO2007 8 лет назад

Yes, the whole cavity (tank) is full with mineral oil All the TX core, cables are submerged with oil.

@slademcthornbody9060 8 лет назад

Epic video Ray

@douro20 8 лет назад

Do they actually test the accumulated gases with a gas chromatograph?

@RODALCO2007 8 лет назад

Don't know for sure, they go to a testlab, where they are analysed.

@douro20 8 лет назад

Ever hear anyone calling them "beechwood relays"? That was a common mistake in old German manuals because they were being translated by people unfamiliar with the technology.

@RODALCO2007 8 лет назад

No, sounds cool, I would translate it as Bookwood. Buch is German for book.

@douro20 8 лет назад

+RODALCO2007 It actually is beechwood, though; the word comes from the Middle High German word "beoch" meaning beech.

@renton9999 8 лет назад

looking at the wires, I'd say there was a leak someplace

@bdf2718 7 лет назад

That looks more evolved than designed. Bits sticking out at random with little or no obvious logic to it all. Pretty much like the innards of an animal - it all fits in and does what it's meant to, but nobody sat down and designed it (unless he or she was off his/her head on very serious drugs).

@RODALCO2007 6 лет назад

Agreed, it is certainly not a Brush made transformer. This device was made at a cost rather then quality engineering.

@arjanwilbie2511 8 лет назад

I need some info, can you remember what amperage is on the underground power lines that supply Dutch houses?

@kainhall 8 лет назад

look at your fuse box.....at the main breaker

@arjanwilbie2511 8 лет назад

+kain hall we have 50A, the neighbors left of us 80A the garage right of us 100A and three phase. that is why I am wondering what the max amperage is I can get, i need 50A for my welder alone.

@kainhall 8 лет назад

+Arjan Wilbie a 50 amp breaker is going to break at 51 amps.....simple. if the top speed of a car is 100....you can't go over 100. motor will blow up. best bet would to just call your local power company man. they KNOW 100% sure what service you have....and they can put in a 100 amp service if you need it. we have electric heat...2500w for each heater. in just one room and a garage...it's on a 100 amp service the electricity bill in the -40f montana winters is about 400 to 600 American funny money