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Joined: Jul 2002
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trumpy, we have some at one of our hydro plants that uses water to cool the oil through a heat exchanger, belive it uses lake water.it ends up going down a funnel shaped drain so you can see it running.these trannys are right after the generators.these are hydro type units & there monsters.these are vertical type units with the DC exciter on top. then a smaller plant that used to supply an old mill has horizontal units, with the exciter belt driven.these are proably over 100 yrs old.
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Who says water and 'lectricity don't mix? Very clever solution to a potential major shutdown, rodalco. Have you considered installing some spray jets on all the heat exchangers, rigged so that you'd simply have to hook up a hose and turn on the water? If all the exchangers had an even spray going on, you could probably get more than 5 degrees temperature reduction. In pic #1, how old is that transformer/inductor in the foreground left side? Circuit man, send in pics if you can, it sounds interesting!! edited for spelling (Other than "lectricity, I meant to say it that way. )
Stupid should be painful.
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In pic #1, how old is that transformer/inductor in the foreground left side? was wondering that too.(btw) So how does it feel to have saved the entire town from a blackout Rodalco? Not many can say that. Well done.
Luke Clarke Electrical Planner for TVA.
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At a guess there guys I would say it isn't that old. I also work for a Power Company as does Ray and we have a turn-around time (locally) of 3-5 years before the transformers (of any size) are replaced, drained, stripped down, re-wound and re-commissioned. Electrical apprentices here at Electricity Ashburton certainly do thier time in the Transformer shop. Only way to learn I say, look at how the tranny in front of you is being wound.
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A small local municipal utility did that with some of their pole transformers a number of years ago. We had a spell of very hot weather and to protect the transformers and keep the service on, they ran hoses from a house up the pole and ran the water on the can. They are also the water utility and they gave a rebate to the homeowner for the water used. Don
Don(resqcapt19)
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Who is that up on the pole in pic #6 (The one with the arrow and available signs?)
Is he working on the earthing project, or is that a photoshop job?
John
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mxslick These nozzles could have been prepared prior to the actual shutdown but the project managers didn't think of that option.
It was a matter of perhaps an extra half hour and power would have been off by O.T. trip. As a temporary solution it worked well, Indeed for a future constraint it is well worth putting a nozzle on each radiator, althopugh the water pressure from the tap wasn't too flash. 80 metres of garden hose, some splitters, nozzles and cable ties, job done. The fans actually helped quite well in getting the water to the other 4 radiator blocks.
That transformer on the foreground is T2 (110/33 kV) from the Wairau substation and is ± 30 years old and scheduled for maintenance next year. It has beeen leaking oil like that for at least 5 years.
Luketrician Haven't heard a formal thank you yet, but that is typical in our industry. The asset owners auditor and supervisor were on site and were impressed how a simple solution was so effective.
Hotline One of the linemen, I don't know who it was. It was not for a photoshop. Just happened to see it from the distance. He had to use the spikes from his ladder up and through the 110 lines.
Trumpy Thanks for putting the photo's on ECN.
The product of rotation, excitation and flux produces electricty.
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Rodalco, thanks for the prompt reply and insight. The ironic part is, that 30 year-old transformer will probably continue to outlast the more modern one. I've heard from some of the guys in the local POCO that the new transformers are, in comparison to the older ones, basically junk, with the actual service life rarely more than 15 years.
Stupid should be painful.
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I wonder what a person would or could posibly be doing up there that high in the air. just crazy if you ask me.
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