Authorized Personnel Only - S2E19- Cleaning A Hydroelectric Generator Stator The Hard Way
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- čas přidán 28. 08. 2024
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Just completed hand cleaning, aka "stick and rag method", a 7 MW unit. We determined due to the age of the insulation, cryo cleaning would not be an option. The units are 50 and 65 years old and nearing end of life of the insulation and will need to be rewound on the next cycle. We use plain mineral spirits on the metal components, and a product called PF cleaner on the windings. PF cleaner is non conductive and leaves no residue. Then recoat with type F insulating paint. We conduct megger, PI, and pole drop testing prior, during and after work.
next time try to rent a dry ice blasting thing, this is amazing we use it all the time for the stators, it works wonders and it is really cheap if you can rent one.
Also the windings own resistance goes up with temperature thus generating even more heat
And reducing how much power can make dollars even more!
The way and energy this guy puts into his video's reminds me so much of watching Bill Nye the Science Guy
Me: Describe Eddie currents and hysteresis without saying Eddie currents and hysteresis: Chris: Hold my beer!
Brilliant!
Had to clean a 600HP motor out when we replaced the bearings on it. Was used to shed tires to oblivion and inside it had a lot of rubber carbon char and some tire wires. After cleaning the windings got a fresh coat of that conformal coating material. The stuff smells like cancer in a can lol 😅
"The rotor spins at 120 rpm". Ok going back to my nuclear power training (LCDR USNR (Ret)), NP=120f "Nuclear Power is 120 times the Fun", and assuming standard North American grid frequency of 60 hz, that means... a 60 pole generator?! WOW!
Yup, all of our hydro plants have very low RPM generators with lots of poles (because we have to get 60Hz no matter how slow we spin). Seeing turbine RPMs way down at only a couple hundred is pretty common.
@@Physicsduck I was going to say how surprised I was that it only spun about twice a second, but then I remembered that my ships' propellers usually spun at ~75 rpm at standard cruising speeds, so maybe that isn't as slow as I thought. BTW, with 60 poles, that's one every 6°. Let's see...assuming a 6 foot diameter ( judging by comparing Chris's size to that of the radius of the stator.) times π and divided by 60, that's a pole every 3.76 inches.
Are the poles delta or wye connected?
They're bigger than they look, and I'm smaller. The generator in this video is about 10 feet in diameter on the outside I'd guess. I'll get you some detailed specs in a future video and you can work out the number of poles. :)
I'm not totally certain, but I think they're Delta.
I'm super late to this party but, if i may offer my two cents. That coating will be unaffected by the simple green because that coating is Glyptal alkalyd resin, which is incredibly stable and chemical resistant, which is part of why it is in such good shape after all those years of being abused inside that generator.
At the Company I worked at, we had a crap load of old door openers. Faced a similar problem w/those much, much smaller stators from baked on bird shit and whatever. Simple Green worked okay, and never damaged the enamel on the windings. Not a fun task.
Your not fooling anyone @ChrisBoden you're having a blast working on the old Iron and bringing it back to life betcha as you may you're having fun. And look at it this way what would you be doing otherwise being a menace in the corporate world lol..... Really enjoy your videos keep up the great work. By the way are you on Instagram ?
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Oh man do I love your content now Loved your shorts but I love the fact you blue collar like me and hate it when shit breaks😂
...flying by in a flash, repelled and attracted, always spaced by a thin cushion of air.
See also: disk drive read / write head
The electrical grid is an amazing human accomplishment when you stop to think how we harvest near magic cause someone once thought i wonder what would happen if i spin a magnet in a coil of wire
As I am so fond of saying there are two rewards for hard work and pointing out places where the employer can save/increase money...
The first is more work.... till there is nothing left to do...
The second which follows the last part of the first; is a pink slip with no expected return date.
Any shorted windings ? Du you recoat with enamel ?
Actually you can power wash it as long as you dry it out completely afterwards so this guy says you can’t but you actually can. A hot water power wash would have gotten all that crud off it and it would have gotten all the crud inside them windings not just the outside were he is wiping off Wich is basically nothing it’s better than nothing. Could have use a media blaster too to thoroughly clean it if something is making you money then it’s worth it I’d say.
So the second law of thermodynamics gets you hot under the collar? Have you got a rough estimate of how more efficient it will be when clean or is it just a case of try it and see?
Could u not just wash it with a steam cleaner or hot water pressure washer ?? I know nothing about a hydro electric generator and your smarter than me, so I guess I should ask, why can't you clean it with a steam cleaner or a hot water pressure washer ?? Also how old is the generator ?? Thanks for any info.... just found your channel.... you got a new sub !!!!
Thank you! :) I'm honoured!. The reason not to clean it with high pressure water is because it's a pain to get it DRY again. Water conducts electricity.
@@Physicsduck
Ahhh !!! Makes perfect sense... But theoretically if u had plenty of time and good enough weather that could be done ?? How old is that generator if u don't mind me asking?
Lol. No good deed goes unpunished. Nice job 👍
Thank you :) That job SUCKED, but generator efficiency for the year after was measured at 104%. :) They had to make a new chart!
@@Physicsduck was the staff really going to reassemble without cleaning? That’s nuts. You call this unit 2, how many units are there? Are they identical?
There's a lot of them. I work for Big Beaver (bigbeaverenergy.com) and we have a whole fleet of plants. No two are exact duplicates (things just evolve so much over time), but they're all similar enough.
@@Physicsduck interesting channel, thanks.
You could have gotten a compressor and a fine air nozzle and blown the crud out of the grooves. Way faster. Also you could try renting a dry ice blaster
I would use a cleaner called citra cleen sold by kl jack with a suction sprayer that stuff pulls the oil out of the coils
Love them old turbines !!
Just dump a couple hundred gallons of brake kleen in it.
and a match stick, it's job well done :P
Couldn't you just perform a periodic, time based DC High potential test on the Stator windings and trend the leakage current for an indicator to when the windings should be cleaned ?
Oh! Great! Now i can clean the huge dirty stator i have here in my basement! I never had anything to clean the big stator in my basement with, but now i know what to get!
Well if that rotor spins at 200RPM you have a something like 36 pole Stator....Damn!
Statornary is that a word? Or is it Stationary?
That disclaimer.... OMG... PRICELESS!!!
Where do I find an 'editable' copy?
The spinney part....LoL
While exuberance at having finished that tedious and precise job is understandable, my question is about the liquid detergent. Before you started, you opined that water is bad on a job like that, but it seemed to me that water would be better than any carbon-based cleaner, as it would not attack the varnish. It would also be better than scrubbing for the same reason (assuming low pressure application) but you have now used both water and abrasion. The product you used has water in it, and the tool you used applied abrasion.
Those are both fine, but are you going to check the windings with low voltage to test for short circuits between wires? Might it be a good idea to re-varnish? (You are still a hero.)
Water in massive amounts is bad. The only water we used was the liquid inside the straight Mr.Clean. Nothing additional. We wet the rags and wiped it down. This level of moisture doesn't pose any significant danger to the operation. There's more moisture condensing out of the air in the room from the space heaters.
All windings are megged out and tested before reassembly as well.
@@Physicsduck Thank you for your nice response. That stator, freshly cleaned, is a beautiful work of craftsmanship to behold. You have honored the makers of it with your careful and much needed work.
I suppose for the same reason a steam cleaner is just as bad.
I'll bet the "varnish" was Glyptal. Good oil resistance, to the extent race car engine builders use it to coat the pushrod valley to help in oil shedding and return to the crankcase.
Noticed that some of these big old grid generstors seem to look kind of thin/ narrow in the actual generation (stator) area; as supposed (compared) to a smaller portable generator, or the little alternator in ones vehicle.?🤔 what determines the physical size (width/ height or whatever of the generator design? Voltage, amps, cycles/ phases?
Surface speed and total capacity. A slow rotating speed needs a larger diameter to bring the ideal surface speed up at the poles. The width is then dictated by the total power available.
I love how this guy sometimes get emotional about his tec. Can relate to that easily.
that's gonna be a lot of 99% isopropyl
oh, it was!
Dry clean only with lint free rags.
Is that stator coated in glyptol? It looks the same color
What oil do you use in that turbine?
Ahh, just need about 10 gallons of carbontech, fix it right up!
Just took the time to read the disclaimer. It's sacastically comedic brilliance. Definitely Chuck Lorre-esque. As such I must be forced to unsubscribe... Just Kidding. Definitely excellent content. Keep on keeping on.
Couldn't you pressure wash it with a medium-low pressure nozzle?
Just read other comment reply, got it
It seems fun for some time. I can go clean shit from generator if given enough money :D
Hmmh? should'a used a pressure washer (Judiciously of Course) to clean that stator assembly....
what does the tilt in the wires do?
You mean besides getting that winding turn connected to the successive winding turn?
Sam what are you doing here?
I would try dawn next time.
This is the opposite of ASMR :)
Brake cleaner
So Brake Cleaner would not work ? So Mr Clean is the way to go???
😂😂😂😂😂😂😂
DE N2JYG